Motorola MVME1X7P User Manual
Programming Model
http://www.motorola.com/computer/literature
4-23
4
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.
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.
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