Motorola MVME172 用户手册
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.
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:
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