62
7
6
5
4
3
2
1
0
S e lec t s
1 o f 2 5 6
S e lec t s
1 o f 6 4
B it
1 6 K P a g e S ize
6 4 K P a g e S ize
F a c t o r y S S D P a g e S e lec t i o n R e g i s t e r
The Page Selection Register is selected by writing an index value of 3 to the Custom
Feature Index Register.
MOV
DX,CF_INDXREG
IN
AL,DX
;READ INDEX REGISTER
JMP
$+2
;DELAY FOR ISA BUS I/O
JMP
$+2
;
AND
AL,3
;MASK INDEX BITS
OR
AL,3
;INDEX = SSD PAGE REGISTER
OUT
DX,AL
JMP
$+2
;DELAY FOR ISA BUS I/O
JMP
$+2
;
MOV
DX,CF_DATAREG ;SELECT DESIRED SSD PAGE
IN
AL,DX
;READ INDEX REGISTER
JMP
$+2
;DELAY FOR ISA BUS I/O
JMP
$+2
;
MOV
AL, <desired page>
OUT
DX,AL
JMP
$+2
;DELAY FOR ISA BUS I/O
JMP
$+2
;
14.3.2 Factory SSD Write Enable
The Write Enable line for the Factory SSD is bit 4 of the Custom Feature Index Register. A
value of "1" enables writes, a value "0" disables writes.
