Motorola MVME1X7P - Manual (Page 271)

Programming Model
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Note that if STON2-0 is zero, the scrubber always releases
the DRAM after one memory cycle, even if neither the
local bus nor refresher need it.
RWB7 Read/Write Bit 7 is a general-purpose read/write bit.
Scrub Prescaler Counter (Bits 21-16)
The Scrub Prescaler counter uses the 1MHz clock as an input to create the
0.5 Hz clock that is used for the scrub period. Writes to this address update
the scrub prescaler. Reads to this address yield the value in the scrub
prescaler. The ability to read and write to the scrub prescaler is provided
for test purposes. Programming this counter is not recommended. This
register reflects the current value in the scrub prescaler bits 21-16.
Scrub Prescaler Counter (Bits 15-8)
This register reflects the current value in the scrub prescaler bits 15-8.
ADR/SIZ 1st $FFF43038/2nd $FFF43138 (8-bits)
BIT 31 30 29 28 27 26 25 24
NAME 0 0 SPS21 SPS20 SPS19 SPS18 SPS17 SPS16
OPER R/W R/W R/W R/W R/W R/W R/W R/W
RESET 0 PLS 0 PLS 0 PLS 0 PLS 0 PLS 0 PLS 0 PLS 0 PLS
ADR/SIZ 1st $FFF4303C/2nd $FFF4313C (8-bits)
BIT 31 30 29 28 27 26 25 24
NAME SPS15 SPS14 SPS13 SPS12 SPS11 SPS10 SPS9 SPS8
OPER R/W R/W R/W R/W R/W R/W R/W R/W
RESET 0 PLS 0 PLS 0 PLS 0 PLS 0 PLS 0 PLS 0 PLS 0 PLS