Scrub Prescaler Counter (Bits 21-16); Scrub Prescaler Counter (Bits 15-8) - Motorola MVME1X7P Programmer's Reference Manual

RWB7

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.
ADR/SIZ
BIT
31
NAME
0
OPER R/W
RESET
0 PLS

Scrub Prescaler Counter (Bits 15-8)

This register reflects the current value in the scrub prescaler bits 15-8.
ADR/SIZ
BIT
31
NAME SPS15
OPER
R/W
RESET
0 PLS
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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.
Read/Write Bit 7 is a general-purpose read/write bit.
1st $FFF43038/2nd $FFF43138 (8-bits)
30 29 28
0 SPS21 SPS20
R/W R/W R/W
0 PLS 0 PLS 0 PLS
1st $FFF4303C/2nd $FFF4313C (8-bits)
30 29 28
SPS14 SPS13 SPS12
R/W R/W R/W
0 PLS 0 PLS 0 PLS
Programming Model
27 26 25
SPS19 SPS18 SPS17
R/W R/W R/W
0 PLS 0 PLS 0 PLS
27 26 25
SPS11 SPS10 SPS9
R/W R/W R/W
0 PLS 0 PLS 0 PLS
4
24
SPS16
R/W
0 PLS
24
SPS8
R/W
0 PLS
4-23