Motorola MVME172 - Manual (Page 315)

Programming Model
http://www.mcg.mot.com/literature 5-25
5
Chip Prescaler Counter
This register reflects the current value in the prescaler counter. The
Prescaler Counter is used with the BCLK Frequency Register to produce a
1 MHz clock signal for use by the refresher, and by the scrubber. The
register is readable and writable for test purposes. Programming of this
register is not recommended.
Scrub Time On/Time Off Register
STOFF2-STOFF0
STOFF2-STOFF0 control the amount of time that the
scrubber refrains from requesting use of the DRAM each
time it gives it up during a scrub. They control the off time
as follows:
ADR/SIZ 1st $FFF43030/2nd $FFF43130 (8-bits)
BIT 31 30 29 28 27 26 25 24
NAME CPS7 CPS6 CPS57 CPS4 CPS3 CPS2 CPS1 CPS0
OPER R/W R/W R/W R/W R/W R/W R/W R/W
RESET 0 P 0 P 0 P 0 P 0 P 0 P 0 P 0 P
ADR/SIZ 1st $FFF43034/2nd $FFF43134 (8-bits)
BIT 31 30 29 28 27 26 25 24
NAME SRDIS 0 STON2 STON1 STON0 STOFF2 STOFF1 STOFF0
OPER R/W R R/W R/W R/W R/W R/W R/W
RESET 0 PLS 0 0 PLS 0 PLS 0 PLS 0 PLS 0 PLS 0 PLS