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CARD-PCI/GX Hardware Manual
EPSON
Rev.A
40
4.2 Hard disk
SCE8720C only supports primary IDE. Up to 2 hard disks, master and slave, can be
controlled. IDE interface complies with ANSI ATA-4 (ultra DMA/33), (Refer to ANSI
ATA-4 for detailed specifications of I.F) Therefore, it can operate in PIO mode 1, 2, 3 or 4,
or Ultra DMA/33. Connection method of HDD is shown below. If secondary IDE is needed,
extend to the ISA bus:
SCE8720C
IDE
IDED15
~
0
IDEA2
~
0
IDEIOR#
IDEIOW#
IDECS1FX#
IDECS3FX#
IDERDY
IDEINT(IRQ14)
IDEDRQ
IDEACK#
IDERESET#
D15
~
0
A2
~
0
IOR#
IOW#
CS1FX#
CS3FX#
RDY
INT(IRQ14)
DRQ
DACK#
RESET#
Figure 4.1 IDE interface connection
Each signal of IDE can be directly connected to IDE with no problem. However, it is
sometimes better to add serial dumping resistances of 33
Ω
or so in order for
countermeasure against noises.
Output level of each IDE signal is 3.3V, and input level is 5V-tolerant. No pull-up or pull-
down is required.