CARD-PCI/GX Hardware Manual
Rev.A
EPSON
29
Signal name
(35 pins in total)
I/O
Function description
IOR#
O
I/O read
Active low
Signal which requests the I/O device on the ISA bus to
output data to SD[15:8] or SD[7:0].
IOW#
O
I/O write
Active low
Signal which requests the I/O device on the ISA bus to
accept data from SD[15:8] or SD[7:0].
MEMCS16#
I
Memory chip select 16
Active low
Signal which lets the memory device on the ISA bus
indicate the SCE8720C that 16-bit transfer is possible by
the current memory cycle.
IOCS16#
I
I/O chip select 16
Active low
Signal which lets the I/O device on the ISA bus indicate
the SCE8720C that 16-bit transfer is possible by the
current I/O cycle.
IOCHRDY
I
I/O channel ready
Active high
Signal which terminates the ISA bus cycle.
When the memory or the I/O device on the ISA bus wants
to extend the bus cycle, it can extend the cycle by setting
this signal to low immediately after detecting an effective
address and command. SCE8720C continues the bus
cycle until this signal becomes high.
IRQ[5,9,10,11]
I
or
O
Interrupt request
Active high
Signals which request SCE8720C for interruption.
When being used by the serial interface inside
SCE8720C, IRQ11 and 10 become outputs. When being
not used, they become inputs and can be used on the ISA
bus.
When being used by the parallel interface inside
SCE8720C, IRQ5 becomes output. When being not used,
they become inputs and can be used on the ISA bus.
