Error_Address Register; Scrub/Refresh Register - Motorola MVME5100 Programmer's Reference Manual

Error_Address Register

Address
Bit
Name
Operation
Reset
ERROR_ADDRESS

Scrub/Refresh Register

Address
Bit
Name
Operation
Reset
scb0, scb1 These bits increment every time the scrubber completes a
swen
SCRUB_FREQUENCY
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$FEF80038
ERROR_ADDRESS
READ ONLY
0 P
These bits reflect the value that corresponds to bits 0-28 of
the PPC60x address bus when the SMC last logged an
error during a PowerPC access to SDRAM. They reflect
the value of the SCRUB ADDRESS counter if the error
was logged during a scrub cycle.
$FEF80040
READ ZERO
X
scrub of the entire SDRAM. When they reach binary 11,
they roll over to binary 00 and continue. These bits are
cleared by power-up reset.
When set, swen allows the scrubber to perform write
cycles. When cleared, swen prevents scrubber writes.
Determines the rate of scrubbing by setting the roll-over
count for the scrub prescale counter. Each time the SMC
performs a refresh burst, the scrub prescale counter
increments by one. When the scrub prescale counter
reaches the value stored in this register, it clears and
resumes counting starting at 0.
Programming Model
SCRUB FREQUENC
READ ZERO READ/WRITE
X
3
Y
$00 P
3-51