System information

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Memory Maps

Memory Maps B-509

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

Table B-7 Cisco 4000 Memory Map

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 —

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 32

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