cc/td/doc/cisintwk
hometocprevnextglossaryfeedbacksearchhelp

Table of Contents

Memory Maps

Memory Maps

This appendix presents memory maps for selected product platforms, processors, and interface cards. Memory map information is useful for technically qualified users who understand concepts of low-level operating systems, bus structures, and address mapping in computer systems.

When using this appendix, be aware of the distinct difference between program counter values and operand addresses. The addresses that appear in this appendix are operand values and should not be confused with program counter values.

Note All memory addresses are in hexadecimal, unless otherwise noted.

Memory Maps and Troubleshooting

Memory map information can be useful when you are determining whether a problem exists in the software or in the hardware. The system software can provide information about the reasons for a system crash. This information appears in the form of error messages issued by the ROM monitor when an exception is encountered.

Failure Types

When a system crashes, the ROM monitor reports a failure type. The failure type is important both in its own right and as a guide to interpreting the other information the system provides. Failure types are usually one of the following:

Bus Error

The system encounters a bus error when the processor tries to use a device or a memory location that either does not exist or does not respond properly. Bus errors typically indicate either a software bug or a hardware problem. The address the processor was trying to access when the system crashed provides a key as to whether the failure is due to software or hardware.

If the operand address is valid, the problem is probably in the hardware. The memory maps listed later in this appendix list addresses for selected hardware platforms.

Bus errors on an address not in the map usually indicate a software bug.

Address Error

Address errors occur when the software tries to access data on incorrectly aligned boundaries. For example, 2- and 4-byte accesses are allowed only on even addresses. An address error usually indicates a software bug.

Watchdog Timeout

Cisco processors have timers that guard against certain types of system hangs. The CPU periodically resets a watchdog timer. If the timer is not reset, a trap will occur. Failure to service the watchdog timer indicates either a hardware or a software bug.

Parity Error

Parity errors indicate that internal hardware error checks have failed. A parity failure is almost always due to a hardware problem. Use the memory maps listed later in this chapter to identify the affected hardware.

Emulator Trap

Emulator traps indicate that the processor has executed an illegal instruction. Emulator traps can be caused either by software taking illegal branches or by hardware failures, notably ROM failures.

Error Addresses

By observing the operand address, you can locate the general area of the router where the error occurred. Hardware problems can be inferred only from a bus error on a legal address, not from an emulator trap or illegal instruction trap. When looking at the bus error, the operand address---not the program counter address---provides the memory map location of the error.

show stacks Command

You can use the show stacks exec command to display data saved by the ROM monitor, which includes a failure type, an operand address, and a failure program counter. This data is overwritten when the system is reloaded, so you might want to check your configuration register settings and decide how you want to recover from system crashes. Stack traces can be used by qualified technical support representatives who have access to symbol tables, object files, and source code.

Figure B-1 shows an example of the show stacks output from a software failure. The message "Software forced crash" indicates that the software detected a condition it did not expect and from which it could not recover. A technical support representative can use the listed program counter as a trace to the code responsible for the failure.


Figure B-1: show stacks Command Output Showing the Software Program Counter Address


Figure B-2 shows output from a hardware error and includes an example of a hardware operand address that can be used with the memory maps in this appendix. The operand address points to the register space for MCI unit 0 and indicates a hardware or microcode problem with that unit.


Figure B-2: show stacks Command Output Showing the Hardware Address


Memory Maps

The following tables summarize memory map information for the various Cisco platforms:


Table B-1: Cisco 1000 Memory Map

Address Size Chip Select Description

0000000-00FFFFF

1 MB

CS0

ROM

2000000-2FFFFFF

16 MB

CS1,2

DRAM up to 16 MB

6000000-600FFFF

64 Kb

CS6

PCMCIA I/O space

8000000-800FFFF

16 MB

CS5

PCMCIA/PC card attribute memory

8010000-8FFFFFF

16 MB

CS5

PCMCIA/PC card common memory

C0003E0-C0003E1

64 Kb

CS4

PCMCIA controller index and data register

E000000-E007FFF

32 Kb

CS7

NVRAM

FF00000-FF00FFF

1 MB

360DPR

68360 dual port memory (top 1 MB)

CPU Space:

003ff00-003ff03

4 bytes

MBAR for 68360


Table B-2: Cisco 2000 Memory Map

Address Description Comments

00000000-0017FFFF

CPU and packet memory (DRAM)

1.5 MB

01000000-011FFFFF

ROM monitor and system image code space (EPROM)

2 MB

02000000-02007FFF

Configuration RAM

32 KB

02100000-0213FFFF

Control registers and I/O devices

Details follow

02110000

Control register 1

---

02110002

Control register 2

---

02110040

PROM cookie

---

02110100

Status register

---

02120040

Timer control register

---

02130000-02130003

Ethernet controller

---

02130000-0213000F

Token Ring controller

---

02130040-02130043

Serial controller

---

02130080

Serial control register 1

---

02130081

Serial control register 2

---


Table B-3: Cisco 2500 Memory Map

Address Bit Width Description Comments

00000000-00FFFFFF

32

DRAM

2, 4, 8, or 16 MB

00000000-001FFFFF

32

DRAM 2 MB

---

00000000-003FFFFF

32

DRAM 4 MB

---

00000000-007FFFFF

32

DRAM 8 MB

---

00000000-00FFFFFF

32

DRAM 16 MB

---

00000000-001FFFFF

8/16

Boot Flash memory

1 or 2 MB, when Flash memory PCMCIA card is not installed

00000000-001FFFFF

16

Flash memory PCMCIA card

Boot mode

01000000-011FFFFF

16

Boot EPROMs for ROM
monitor and RXBOOT images

1 or 2 MB ROM; 2 MB Flash memory

01000000-011FFFFF

16

Flash memory PCMCIA card

When installed

02000000-0201FFFF

8

Configuration NVRAM

32 or 128 KB

02000000-02007FFF

8

Configuration NVRAM (32 KB)

---

02000000-0201FFFF

8

Configuration NVRAM (128 KB)

---

02100000-0213FFFF

8/16

Onboard I/O registers and chips

---

03000000-03FFFFFF

32

Flash memory RAM (SIMMs)

4, 8, or 16 MB

03000000-033FFFFF

32

Flash memory RAM (4 MB)

---

03000000-037FFFFF

32

Flash memory RAM (8 MB)

---

03000000-03FFFFFF

32

Flash memory RAM (16 MB)

---

08000000-081FFFFF

8/16

Onboard boot EPROMs (remapped)

1 or 2 MB, when PCMCIA Flash memory card is installed


Table B-4: Cisco 3000 Memory Map

Address Description Comments

00000000-00FFFFFF

Main memory DRAM

---

01000000-011FFFFF

Secondary DRAM

---

02000000-0201FFFF

NVRAM

---

02100000-02100FFF

Channel B: 68302 registers

---

02101000-02101FFF

Channel B: 63802 RAM

---

02110000

System control register 1

---

02110002

System control register 2

---

02110100

System status register

---

02110040-0211005F

Cookie

---

02120000-02120003

Counter/timer (CNTR)

---

02120040

Counter control register (CCTL)

---

02120100-0212013F

Console ports

---

02130000-02130003

Channel A: LANCE chip

---

02130040-02130043

Channel B: LANCE/serial chip

---

02130080-02130083

Channel B: serial DTR register

---

03000000-03FFFFFF

Flash memory

---

04000000-042FFFFF

Secondary RAM

When main memory = 16 MB


Table B-5: Cisco 3104 and Cisco 3204 Memory Map

Address Description Comments

00000000-00FFFFFF

Main DRAM

1-, 4-, 8-, and 16-MB sizes

01000000-010FFFFF

Boot EPROMs for ROM monitor
and bootstrap image

---

01000000-011FFFFF

Boot Flash memory for ROM monitor
and bootstrap image

Onboard Flash memory or
PCMCIA Flash memory
card, 2 MB

02000000-0201FFFF

Configuration NVRAM

32 or 128 KB size

02100000-0213FFFF

Onboard registers and chips

---

03000000-03FFFFFF

Flash memory SIMM

Up to 16 MB

04000000-041FFFFF

I/O memory (packet memory)

512 KB or 2 MB sizes

08000000-081FFFFF

Remapped onboard boot Flash memory

Remapped when PCMCIA
Flash memory card is installed


Table B-6: Cisco 3104 and Cisco 3204 Memory Map of Onboard Registers and Chips

Address Description Comments

021000F2-021000F3

Base address register for 68302

---

021000F4-021000F7

System control register for 68302

---

02101000-021013FF

System RAM for 68302

---

02101400-021017FF

Parameter RAM for 68302

---

02101800-02101FFF

Internal registers for 68302

---

02110000

System control register 1

---

02110002

System control register 2

---

02110004

System control register 3

---

02110006

System interrupt register

---

02110060

Serial NVRAM control register

---

02120000-02120003

Timer counter

---

02120040

Counter control register

---

02120100-0212013F

Console interfaces

---

02130000-0213003

Ethernet controller

---

02131000-0213100F

Token Ring controller

---

02131010-02131011

Hardware map register 0

---

02131012-02131013

Hardware map register 1

---

02132000-021320FF

Serial controller

---

02132100-02132101

Serial 0 device register

---

02132102-02132103

Serial 1 device register

---


Table B-7: Cisco 4000 Memory Map

Address Bit Width Description Comments

00000000-0003FFFF

32

System SRAM

256 KB, fixed; 0 wait read, 1 wait write

00040000-00FFFFFF

32

System DRAM
memory (SIMMs)

8-, 16-, 32-bit unaligned access supported; 4, 8, 16, or 321 MB

00040000-003FFFFF

4 MB

---

00040000-00FFFFFF

16 MB

---

01000000-01FFFFFF

16

Boot EPROM

2 MB, fixed

01000000-010FFFFF

1 MB

---

01000000-011FFFFF

2 MB

---

01000000-013FFFFF

4 MB

---

01000000-017FFFFF

8 MB

---

02000000-02FFFFFF

8 or 32

Onboard resources

---

02020000

System I/O

---

03000000-03FFFFFF

32

Flash memory EPROM or
EPROM

32-bit read/write access

03000000-031FFFFF

2 MB

---

03000000-033FFFFF

4 MB

---

03000000-037FFFFF

8 MB2

---

05000000

System DRAM

Upper 16 MB of 32-MB configuration

06000000-06FFFFFF

32

Shared (I/O) memory

8-, 16-, 32-bit unaligned access supported; 1-16 MB

06000000-060FFFFF

1 MB

---

06000000-063FFFFF

4 MB

---

06000000-067FFFFF

8 MB

---

04000000-05FFFFFF

Undefined

---

07000000-07FFFFFF

Undefined

---

08000000-08FFFFFF

32

I/O expansion

NIM slots

08000000-080FFFFF

16

NIM at I/O expansion
slot 1

16-bit aligned access only

08100000-081FFFFF

16

NIM at I/O expansion
slot 2

16-bit aligned access only

08200000-082FFFFF

16

NIM at I/O expansion
slot 3

16-bit aligned access only

1Only the Cisco 4000-M supports 32-MB DRAM. The 32-MB configuration is split into two discontiguous pieces, with the upper 16 MB mapped to begin at location 05000000.
2Only the Cisco 4000-M supports 8-MB Flash memory.


Table B-8: Cisco 4000 Memory Map of Onboard Resources

Address Bit Width Description Comments

02000000-0201FFFF

8

NVRAM battery
backed up CMOS SRAM

128 KB, fixed; also accommodates 32 KBx8 and 8 KBx8

02110000

32

System status and
control registers

---

02110002

Hardware revision

---

02110040-0211005F

8

System ID PROM cookie

24 bytes

02110100

32

Shared memory control register

---

02120000

8

Counter timer

---

02120040

8

Counter interrupt control register

---

02120100-0212013F

8

Control serial I/O

---


Table B-9: Cisco 4500 Memory Map

Address Bit Width Description Comments

60000000-61FFFFFF

64

System DRAM

Capable of 8- to 64-bit access, cached

60000000-607FFFFF

8 MB

---

60000000-60FFFFFF

16 MB

---

60000000-61FFFFFF

32 MB

---

BFC00000-BFC7FFFF

8

Boot EPROM

---

BFC00000-BFC1FFFF

128 KB

---

BFC00000-BFC7FFFF

512 KB

---

3E000000-3EFFFFFF

8

Onboard resources

---

30000000-30FFFFFF

32

System Flash memory
EPROM

---

30000000-303FFFFF

4 MB

---

30000000-307FFFFF

8 MB

---

30000000-30FFFFFF

16 MB

---

38000000-387FFFFF

32

Boot Flash memory
EPROM

---

38000000-383FFFFF

4 MB

---

38000000-387FFFFF

8 MB

---

40000000-40FFFFFF

32

Shared memory

8-, 16-, 32-bit access

40000000-403FFFFF

4 MB

---

40000000-40FFFFFF

16 MB

---


Table B-10: Cisco 4500 Memory Map of Onboard Resources

Address Bit Width Description Comments

3E000000-3E07FFFF

8

NVRAM

Battery backed up SRAM

3E000000-3E01FFFF

8

128 KB

---

3E000000-3E07FFFF

8

512 KB

---

3E000000

8

Time of day clock

---

3E800400

8

System ID PROM cookie

---


Table B-11: Cisco 7000 Memory Map

Address Description Comments

11110100

System status register

---

11110400

Flash memory card status

---

11110C00

I/O address base

SwitchBus address space. Each unit occupies 64 bytes (0x40).

11120040

Timer control register

---

11120200

Environmental monitor control

16 bits

11120300

Environmental monitor status

32 bits

11130000

Diagnostic bus

---

11131000

ID PROM

---

11140000

NVRAM

---

1115FC00

Environmental monitor
NVRAM base address

---

1115FFFF

Real time calendar bit

---

11200000-11FFFFFF

Reserved

14 MB reserved

12000000

Onboard Flash memory

---

14000000

External Flash memory

---


Table B-12: Cisco 7200 Series (NPE-150) Memory Map-Hardware

Memory Base Memory Limit Size Device

0x0 0000 0000

0x0 07FF FFFF

128 MB

System DRAM

0x0 0800 0000

0x0 0FFF FFFF

128 MB

System DRAM (reserved)

0x0 1000 0000

0x0 13FF FFFF

62 MB

Reserved

0x0 1400 0000

0x0 141F FFFF

2 MB

GT-64010 registers

0x0 1420 0000

0x0 19FF FFFF

94 MB

Reserved

0x0 1A00 0000

0x0 1A3F FFFF

4 MB

Internal Flash SIMM

0x0 1A40 0000

0x0 1BFF FFFF

28 MB

Larger Flash SIMM (reserved)

0x0 1C00 0000

0x0 1DFF FFFF

32 MB

Reserved

0x0 1E00 0000

0x0 1E1F FFFF

2 MB

NVRAM (TOD)

0x0 1E20 0000

0x0 1E7F FFFF

6 MB

Reserved

0x0 1E80 0000

0x0 1E9F FFFF

2 MB

I/O Registers

0x0 1EA0 0000

0x0 1EFF FFFF

6 MB

Reserved

0x0 1F00 0000

0x0 1FBF FFFF

12 MB

Read/write null

0x0 1FC0 0000

0x0 1FDF FFFF

2 MB

Boot EPROM

0x0 1FE0 0000

0x0 3FFF FFFF

x MB

Reserved

0x0 4000 0000

0x0 43FF FFFF

64 MB

PCI-to-PCMCIA interface (top slot)

0x0 4400 0000

0x0 47FF FFFF

64 MB

PCI-to-PCMCIA interface (bottom slot)

0x0 4800 0000

0x0 487F FFFF

8 MB

Fast Ethernet---memory-mapped I/O

0x0 4880 0000

0x0 48FF FFFF

8 MB

PA1---memory-mapped I/O

0x0 4900 0000

0x0 497F FFFF

8 MB

PA3---memory-mapped I/O

0x0 4980 0000

0x0 49FF FFFF

8 MB

PA5---memory-mapped I/O

0x0 4A00 0000

0x0 4A7F FFFF

8 MB

PA7---memory-mapped I/O (reserved)

0x0 4A80 0000

0x0 4AFF FFFF

8 MB

PA9---memory-mapped I/O (reserved

0x0 4B00 0000

0x0 4B0F FFFF

1 MB

PCI PM, first 1M, no byte swap

0x0 4B10 0000

0x0 4B7F FFFF

7 MB

PCI PM, larger PM, no swap (reserved)

0x0 4B80 0000

0x0 4B8F FFFF

1 MB

PCI PM, first 1M, byte swap

0x0 4B90 0000

0x0 4BFF FFFF

7 MB

PCI PM, larger PM, byte swap (reserved)

0x0 4C00 0000

0x0 4C0F FFFF

1 MB

PCI Alias PM, first 1M, no byte swap

0x0 4C10 0000

0x0 4C7F FFFF

7 MB

PCI Alias PM, larger PM, no swap (reserved)

0x0 4C80 0000

0x0 4C8F FFFF

1 MB

PCI Alias PM, first 1M, byte swap

0x0 4C90 0000

0x0 4CFF FFFF

7 MB

PCI Alias PM, larger PM, byte swap (reserved)

0x0 4D00 0000

0x0 4D7F FFFF

8 MB

PA2---memory-mapped I/O

0x0 4D80 0000

0x0 4DFF FFFF

8 MB

PA4---memory-mapped I/O

0x0 4E00 0000

0x0 4E7F FFFF

8 MB

PA6---memory-mapped I/O

0x0 4E80 0000

0x0 4EFF FFFF

8 MB

PA8---memory-mapped I/O (reserved)

0x0 4F00 0000

0x0 4F7F FFFF

8 MB

PA10---memory-mapped I/O (reserved)

0x0 4F80 0000

0x0 4FFF FFFF

8 MB

I/O---memory-mapped I/O (reserved)

0x0 5000 0000

0x0 FFFF FFFF

x MB

Reserved

0x1 0000 0000

0x0 001F FFFF

2 MB

PCI I/O address space

0x1 0020 0000

0x1 4B7F FFFF

~1 GB

Reserved

0x1 4B00 0000

0x1 4B0F FFFF

1 MB

CPU PM, first 1M, no byte swap

0x1 4B10 0000

0x1 4B7F FFFF

7 MB

CPU PM, larger PM, no swap (reserved)

0x1 4B80 0000

0x1 FFFF FFFF

~0 GB

Reserved

0x2 0000 0000

0x3 FFFF FFFF

8 GB

L2 cache is disabled (alias) for low 8 GB

0x4 0000 0000

0x7 FFFF FFFF

16 GB

Cache Controller Tag Op 0

0x8 0000 0000

0xF FFFF FFFF

32 GB

Cache Controller Tag Op 1


Table B-13: Cisco 7200 Series (NPE-150) Memory Map-Software

Memory CPU Physical CPU Virtual Attributes

Non-packet
DRAM

0x00000000-0x015fffff

0x60000000-0x615fffff

Cached, write back, L2 cached

I/O DRAM
(packet)

0x01600000-0x01ffffff




0x2,01600000-0x2, 01ffffff

0x01600000-0x01ffffff

0x61600000-0x61ffffff


0x31600000-0x31ffffff

Uncached

Cached, write back, L2 cached

Cached, write through, no L2 cache

I/O SRAM
(packet),
direct access
by CPU

0x4b000000-0x4b0fffff

0x2,4b000000-0x2, 4b0fffff

0x4b000000-0x4b0fffff

0x7b000000-0x7b0fffff

Uncached

Cached, write through, no L2 cache


Table B-14: Cisco 500-CS Memory Map

Address Description Comments

000000-3FFFFF

ROM

4 MB or less

400000-407FFF

EEPROM (NVRAM)

32 KB

420000-427FFF

LCD registers (not used)

---

428000-42FFFF

Future hardware

---

430000-440000

Reserved

---

460000-460004

LANCE registers

Ethernet controller registers

500000-50007F

Octal UART 0

---

500400-50047F

Octal UART 1

---

600000-7FFFFF

Onboard RAM

---

800000-BFFFFF

2-MB SIMM expansion

---

800000-FFFFFF

8-MB SIMM expansion

---


Table B-15: RP/Cisco 7000 Series Memory Map

Address Bit Width Description Comments

00000000-0FFFFFFF

DRAM

---

10000000-100FFFFF

ROML

---

10400000-104FFFFF

ROMU

---

11000000-110FFFFF

Multibus memory

---

11100000-1110FFFF

Multibus I/O

---

11110000-1112FFFF

Local I/O

---

11130000-11130FFF

Diagnostic bus

---

11131000-111314FF

ID PROM

---

11140000-1115FFFF

NVRAM

---

12000000-13FFFFFF

Internal Flash memory

---

14000000-15FFFFFF

External Flash memory card

---

11110000

16

System control

---

11110100

32

System status register

---

11110400

Flash memory card status

---

11110C00

I/O address base

SwitchBus address space. Each unit occupies 64 bytes (0x40).

11120000

8

Counter timer

---

11120040

8

Counter control register

---

11120100-1112013F

8

Serial I/O ports

---

11120200

Environmental monitor
control

16 bits

11120300

Environmental monitor
status

32 bits

11130000

Diagnostic bus

---

11131000

ID PROM

---

11140000

NVRAM

---

1115FC00

Environmental monitor
NVRAM base address

---

1115FFFF

1

Real time calendar bit

1 bit (bit 0)

11200000-11FFFFFF

Reserved

14 MB reserved

12000000

Onboard Flash memory

---

14000000

External Flash memory

---


Table B-16: RSP Memory Map

Address Bit Width Description

80000000-FFFFFFFF

Available for expansion

60000000-77FFFFFF

Main memory

Common

40000000-5FFFFFFF

Packet memory canonical address bit ordering Bits in byte-swapped packet memory

Common

38000000-3FFFFFFF

Boot EPROM and I/O space

30000000-37FFFFFF

System Flash memory

20000000-2FFFFFFF

Reserved platform specific address space

18000000-1FFFFFFF

Boot EPROM and I/O space

10000000-17FFFFFF

System Flash memory

08000000-0FFFFFFF

Packet memory

00000000-07FFFFFF

Main memory

Individual Addresses:

11110000

16

System control

11110100

32

System status

11120000

8

Counter timer

11120040

8

Counter control register

11120100-1112013F

8

Serial I/O ports

11120200

16

Environmental monitor control

11120300

32

Environmental monitor status

1115FFFF

1

Calendar (1 bit "bit 0")

111104000

8

Flash card status

Virtual Address:

E00000

Slot 0

E20000

Slot 1

E40000

Slot 2

E60000

Slot 3

E80000

Slot 4

EA0000

Slot 5

EC0000

Slot 6

EE0000

Slot 7

F00000

Slot 8

F20000

Slot 9

F40000

Slot 10

F60000

Slot 11

F80000

Slot 12


Table B-17: Multibus Memory Space Assignment

Address Description Comments

20000000-2000FFFF

Memory card

64 KB

20010000-2002FFFF

CSC-R16 card

Unit 0 address, 128 KB

20030000-2004FFFF

CSC-R16 card

Unit 1 address, 128 KB

20050000-2006FFFF

CSC-R16 card

Unit 2 address, 128 KB

20070000-2008FFFF

CSC-R16 card

Unit 3 address, 128 KB

20090000-200AFFFF

CSC-R16 card

Unit 4 address, 128 KB

200B0000-200BFFFF

NVRAM

64 KB

200C0000-200DFFFF

CSC-R16 card

Unit 5 address, 128 KB

200E0000-200FFFFF

CSC-R16 card

Unit 6 address, 128 KB (shared)


Table B-18: Multibus I/O Space Assignment

Address Description Size (in Hex) Comments

20100000

ENVM card

2

Environmental monitor

20100002-2010008F

Unused

20100090

2

CSC-R16M Ethernet mailbox, Unit 0

20100092

2

CSC-R16M Ethernet mailbox, Unit 1

20100098

CSC-R16 card

2

Unit 0

2010009A

CSC-R16 card

2

Unit 1

201000A0

CSC-R card

4

Unit 0

201000A4

CSC-R card

4

Unit 1

201000A8

CSC-R card

4

Unit 2

201000AC

CSC-R card

4

Unit 3

201000B0

CSC-R16M card

2

Unit 0

201000B2

CSC-R16M card

2

Unit 1

201000B4

CSC-R16M card

2

Unit 2

201000B6

CSC-R16M card

2

Unit 3

201000B8

CSC-R16M card

2

Unit 4

201000BA

CSC-R16M card

2

Unit 5

201000BC

CSC-R16M card

2

Unit 6

201000BE

CSC-R16M card

2

Unit 7

2010C000

CSC-MCI card

40

Unit 0

2010C040

CSC-MCI card

40

Unit 1

2010C080

CSC-MCI card

40

Unit 2

2010C0C0

CSC-MCI card

40

Unit 3

2010C100

CSC-MCI card

40

Unit 4

2010C140

CSC-MCI card

40

Unit 5

2010C180

CSC-MCI card

40

Unit 6

2010D000-2010 FFFF

Unused

---

---


Table B-19: CSC/3 Memory Map

Address Bit Width Description Comments

00000000-003FFFFF

RAM

---

01000000-0107FFFF

ROML

---

0108FFFF-010FFFFF

ROMH

---

02000000-020FFFFF

Multibus memory

---

02100000-0210FFFF

Multibus I/O

---

02110000-02110001

16

System control register

---

02110100-02110103

32

System status register

---

02120000

8

Counter timer

---

02120040

8

Counter control register

---

02120100-0212013F

Serial ports

---

020B0000-020B7FFF

NVRAM

Over Multibus


Table B-20: CSC/4 Memory Map

Address Description Comments

D0D0D0D

"Poisoned free" address

Used by the "poisoned free" code to make sure the system is not accessing freed memory. An error at or near this location usually indicates a software bug.

2100000-21FFFFF

Multibus I/O space

Not all I/O space is occupied by interface cards. Bus errors that do not correspond to a real interface card are probably software bugs.

210C000-210C200

MCI and ciscoBus
controllers (CSC-CCTL
and CSC-CCTL2)

Common failures result from attempts to access the command and argument registers that occupy the first 4 bytes of the address space of each board.

21000B0-21000BD

CSC-C2CTR card

Each card occupies 2 bytes.

2100000-2100003

Control register for the
ENVM

Environmental monitor card.

2000000-20FFFFF

Multibus memory space

Used by interface cards and by shared Multibus memory.

20C0000-20FFFFF

Shared memory on
CSC-R16 cards

Token Ring units 5 and 6. Each card has 0x20000 bytes of memory.

20B0000-20BFFFF

Multibus NVRAM
(CSC/2, CSC/3,
CSC/4 cards)

Cards with 32 KB RAM only go through 0x20B7FFF.

2040000-20405FF

CSC-16 card asynchronous
lines (CSC/2, CSC/3,
CSC/4 cards)

Each UART1 is 0x20 bytes; there are two lines per UART.

2010000-20AFFFF

Shared memory on
CSC-R16 cards

Units 0-4. Each card has 0x20000 bytes of memory.

2000000-2007FFF

Shared Multibus memory
primarily used by CSC-R
Token Ring cards

Each card has a system control area within this memory, but the address of each area is decided at runtime and is difficult to predict.

---

System ROM address
space

The ROM monitor starts at the bottom of ROM and is followed by the system image. The location of the system image is not always known and is important only for images that are run from ROM.

A bus error in valid ROM space might indicate bad ROMs, a bad processor card, or in the case of run-from-ROM images, a software bug in which the software tries to write into ROM.

1000000-107FFFF

System ROM address
space

512-KB system ROMs on the CSC/2, CSC/3, and CSC/4 cards, IGS, CS-3000. Run from ROM, system images exist only on the CSC/2 card.

1000000-10FFFFF

System ROM address
space

1-MB system ROMs on the CSC/2, CSC/3, and CSC/4 cards, IGS, CS-3000. Run from ROM, system images exist only on the CSC/2 card.

1000000-11FFFFF

System ROM address
space

2-MB system ROMs on the CSC/2, CSC/3, and CSC/4 cards and the IGS. Run from ROM, system images exist only on the CSC/2 card.

---

Main processor RAM

Bus errors here are usually caused by a hardware failure on the processor card.

0000-0FFFFF

Main processor RAM

CSC/2 card and IGS with 1 MB. On the IGS, the top 0.5 MB is shared packet memory.

0000-17FFFF

Main processor RAM

IGS with 1.5 MB. The top 0.5 MB is shared packet memory.

0000-3FFFFF

Main processor RAM

CSC/3 card

0000-FFFFFF

Main processor RAM

CSC/4 card

0000-47FFFF

Main processor RAM

IGS with 4.5 MB. The top 0.5 MB is shared packet memory.

0000-0FFF

System page

The system page contains several processor and ROM monitor data structures, primarily the trap and interrupt vectors. If the low page gets corrupted, the system might hang rather than crash.

1UART = Universal Asynchronous Receiver/Transmitter


Table B-21: CSC/4 Memory Map

Address Bit Width Description Comments

00000000-00FFFFFF

RAM

---

01000000-013FFFFF

ROML

---

01400000-017FFFFF

ROMH

---

02000000-020FFFFF

Multibus memory

---

02100000-0210FFFF

Multibus I/O

---

02110000-02110001

16

System control register

---

02110100-02110103

32

System status register

---

02120000

8

Counter timer

---

02120040

8

Counter control register

---

02120100-0212013F

Serial ports

---

020B0000-020B7FFF

NVRAM

Over Multibus


hometocprevnextglossaryfeedbacksearchhelp
Posted: Tue May 16 15:21:58 PDT 2000
Copyright 1989 - 2000©Cisco Systems Inc.