Computer Hardware User Manual

Table Of Contents
4-14 Computer Group Literature Center Web Site
MCECC Functions
4
Memory Configuration Register
MSIZ2-MSIZ0
MSIZ2-MSIZ0 together define the size of the total
memory to be controlled by the MCECC sector. These
bits reflect the RSIZ2-RSIZ0 bits in Defaults Register 1.
Note Remember that the DRAM organization presented in the
table above is relevant to the extent that it aids in emulating
DRAM configurations from earlier programming models.
For the actual SDRAM device and size options now
applicable to the MVME1x7P boards, refer to Table 1-1.
FSTRD FSTRD reflects the state of the FSTRD bit in Defaults
Register 1. When 1, this bit indicates that DRAM reads
are operating at full speed. When 0, it indicates that
DRAM read accesses are slowed by one clock cycle.
ADR/SIZ 1st $FFF43008/2nd $FFF43108 (8-bits)
BIT 31 30 29 28 27 26 25 24
NAME 00FSTRD00MSIZ2 MSIZ1 MSIZ0
OPER RRR RRRRR
RESET XXX XXXXX
MSIZ2 MSIZ1 MSIZ0 Memory Size MSIZ2 MSIZ1 MSIZ0 Memory Size
000 4MB100 64MB
001 8MB101128MB
010 16MB110Reserved
011 32MB111Reserved