Xycom XVME-113, User Manual

Page: 39 / 75

XVME-113 RAM/ROM Memory Module
October 1992
3-3
Table 3-2. Data Bit Definitions
Bit Bit Location
D15 Memtypelb
D14 Memtypela
D13 Memsizelb
D12 Memsizela
D11 Memtype2b
D10 Memtype2a
D9 Memsize2b
D8 Memsize2a
D7-D0 Real Time Clock Bits
Determines Memory Type Bank 1 (upper bit)
Determines Memory Type Bank 1 (lower bit) 00=EPROM 01=SRAM 10=FLASH/EEPROM
Determines Memory Size Bank 1 (upper bit)
Determines Memory Size Bank 1 (lower bit) 00=128K x 8 01=256K x 8 10=512K x 8 11=1024K
x 8
Determines Memory Type Bank 2 (upper bit)
Determines Memory Type Bank 2 (lower bit) 00=EPROM 01=SRAM 10=FLASH/EEPROM
Determines Memory Size Bank 2 (upper bit)
Determines Memory Size Bank 2 (lower bit) 00=128K x 8 01=256K x 8 10=512K x 8 11=1024K
x 8
3.3 REGISTER MAP
Table 3-3, on the following page, shows the address map of the 16 RTC registers. The registers are accessed on odd-byte
addresses, beginning at the base address of the XVME-113 in the VMEbus Short I/O space.