W83759A Datasheet, PDF (8/41 Pages) Winbond – ADVANCED VL-IDE DISK CONTROLLER

W83759A
Pin Description, continued
SYMBOL PIN
EMD0
71
/ IDEIOW
TYPE
I/O
-PU
DESCRIPTION
When SYSRST is active, this is an input that latches on the rising
edge of SYSRST .
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
240 nS
1
1
3
180 nS
1
0
3
180 nS
0
1
4
120 nS
0
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
69
I/O _{When SYSRST is active, these pins function as inputs and latch}
/IDEA2,
-PD on the rising edge of SYSRST .
MD0
68
/IDEA1
MD1, MD0: ATA mode of IDE Drive. MD0 and MD1 are used to
select the hard disk access time.
ATA PIO mode Access Time EMD1 EMD0
0
600 nS
0
0
0+
500 nS
0
1
1
400 nS
1
0
2
240 nS
1
1
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-