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
1MHz 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.
ADR/SIZ
BIT
31
NAME
CPS7
OPER
R/W
RESET
0 P
Scrub Time On/Time Off Register
ADR/SIZ
BIT
31
NAME
RWB7
OPER
R/W
RESET
0 PLS
STOFF2-STOFF0
http://www.motorola.com/computer/literature
1st $FFF43030/2nd $FFF43130 (8-bits)
30
29
28
CPS6
CPS57
CPS4
R/W
R/W
R/W
0 P
0 P
0 P
1st $FFF43034/2nd $FFF43134 (8-bits)
30
29
28
0
STON2
STON1
R
R/W
R/W
0
0 PLS
0 PLS
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:
27
26
CPS3
CPS2
R/W
R/W
0 P
0 P
27
26
25
STON0
STOFF2
STOFF1
R/W
R/W
R/W
0 PLS
0 PLS
0 PLS
Programming Model
25
24
CPS1
CPS0
R/W
R/W
0 P
0 P
24
STOFF0
R/W
0 PLS
4-21
4