Scrub Address Register - Motorola MVME5100 Programmer's Reference Manual

System Memory Controller (SMC)
3

Scrub Address Register

Address
Bit
Name
Operation
Reset
SCRUB ADDRESS These bits form the address counter used by the scrubber
3-52
Note that when this register is all 0's, the scrub prescale
counter does not increment, disabling any scrubs from
occurring. Since SCRUB_FREQUENCY is cleared to
0's at power-up reset, scrubbing is disabled until software
programs a non-zero value into it.
$FEF80048
SCRUB ADDRESS
READ/WRITE
0 P
for all blocks of SDRAM. The scrub address counter
increments by one each time a scrub to one location
completes to all of the blocks of SDRAM. When it
reaches all 1s, it rolls back over to all 0s and continues
counting. The SCRUB_ADDRESS counter is readable
and writable for test purposes.
Note that for each block, the most significant bits of
SCRUB ADDRESS COUNTER are meaningful only
when their SDRAM devices are large enough to require
them.
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