Motorola MVME1X7P User Manual
Programming Model
http://www.motorola.com/computer/literature
4-25
4
Scrub Timer Counter (Bits 7-0)
This register reflects the current value in the Scrub Timer counter bits 7-0.
Scrub Address Counter (Bits 26-24)
This read/write register is the Scrub Address counter. Each time the
scrubber performs a scrub memory cycle, the Scrub Address counter
increments. For an entire scrub, the Scrub Address counter starts at 0 and
increments until it reaches the DRAM size that is indicated by the
MEMSIZ pins. Writes to this address update the Scrub Address counter;
reads to this address yield the value in the counter. The ability to read and
write this counter is provided for test purposes. Note that if scrubbing is in
process, the Scrub Time On/Time Off register should be set for the
minimum time on and the maximum time off during any writes to this
register. This register reflects the current value in the Scrub Address
counter bits 26-24.
scrubber performs a scrub memory cycle, the Scrub Address counter
increments. For an entire scrub, the Scrub Address counter starts at 0 and
increments until it reaches the DRAM size that is indicated by the
MEMSIZ pins. Writes to this address update the Scrub Address counter;
reads to this address yield the value in the counter. The ability to read and
write this counter is provided for test purposes. Note that if scrubbing is in
process, the Scrub Time On/Time Off register should be set for the
minimum time on and the maximum time off during any writes to this
register. This register reflects the current value in the Scrub Address
counter bits 26-24.
ADR/SIZ
1st $FFF43048/2nd $FFF43148 (8-bits)
BIT
31
30
29
28
27
26
25
24
NAME
ST7
ST6
ST5
ST4
ST3
ST2
ST1
ST0
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 $FFF4304C/2nd $FFF4314C (8-bits)
BIT
31
30
29
28
27
26
25
24
NAME
0
0
0
0
0
SAC26
SAC25
SAC24
OPER
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RESET
X
X
X
X
X
0 PLS
0 PLS
0 PLS