W83759A
Pin Description, continued
SYMBOL
EMD0
PIN
TYPE
I/O
DESCRIPTION
71
When SYSRST is active, this is an input that latches on the rising
edge of SYSRST .
-PU
/IDEIOW
EMD0: This power-on-setting pin combines with EMD1 to set the
initial enhanced timing mode of hard disk access cycles when the
enhanced mode is selected via the POSS3 configuration register.
ATA PIO mode Access Time EMD1
EMD0
2
3
3
4
240 nS
180 nS
180 nS
120 nS
1
1
0
0
1
0
1
0
IDEIOW : Drive I/O write. An active low output that enables data to
be written to the drive. The duration and repetition rate of IDEIOW
cycles are determined by the type of IDE drive, as specified by
IDEIOR.
MD1
/IDEA2,
MD0
69
68
I/O
When SYSRST is active, these pins function as inputs and latch
on the rising edge of SYSRST .
-PD
MD1, MD0: ATA mode of IDE Drive. MD0 and MD1 are used to
select the hard disk access time.
/IDEA1
ATA PIO mode Access Time EMD1
EMD0
0
600 nS
500 nS
400 nS
240 nS
0
0
1
1
0
1
0
1
0+
1
2
IDEA2, IDEA1: IDE drive address bits 2 and 1. Drive address bits 2
and 1 are outputs to the IDE connector for register selection in the
drive.
- 8 -
WINBOND [ WINBOND ]
