STPC0375BTI3 datasheet(19/51 Pages) STMICROELECTRONICS

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PIN DESCRIPTION

19/51

Issue 1.2

ISAOE#

Bidirectional OE Control. This signal con-

trols the OE signal of the external transceiver that

connects the IDE DD bus and ISA SA bus.

GPIOCS#

I/O General Purpose Chip Select 1.

This output signal is used by the external latch on

ISA bus to latch the data on the SD[7:0] bus. The

latch can be use by PMU unit to control the exter-

nal peripheral devices to power down or any other

desired function.

This pin is also serves as a strap input during re-

set.

2.2.9 IDE CONTROL

PIRQ

Primary Interrupt Request. Interrupt request

from primary IDE channel.

SIRQ

Secondary Interrupt Request. Interrupt re-

quest from secondary IDE channel.

PDRQ

Primary DMA Request. DMA request from

primary IDE channel.

SDRQ

Secondary DMA Request. DMA request

from secondary IDE channel.

PDACK#

Primary DMA Acknowledge. DMA ack-

noledge to primary IDE channel.

SDACK#

Secondary DMA Acknowledge. DMA

acknoledge to secondary IDE channel.

PIOR#

Primary I/O Read. Primary channel read.

Active low output.

PIOW#

Primary I/O Write. Primary channel write.

Active low output.

SIOR#

Secondary I/O Read Secondary channel

read. Active low output.

SIOW#

Secondary I/O Write Secondary channel

write. Active low output.

2.2.10 IPC

IRQ_MUX[3:0]

Multiplexed Interrupt Request.

These are the ISA bus interrupt signals. They are

to be encoded before connection to the STPC

Consumer using ISACLK and ISACLKX2 as the

input selection strobes.

Note that IRQ8B, which by convention is connect-

ed to the RTC, is inverted before being sent to the

interrupt controller, so that it may be connected di-

rectly to the IRQ pin of the RTC.

PCI_INT[3:0]

PCI Interrupt Request. These are

the PCI bus interrupt signals. They are to be en-

coded before connection to the STPC Consumer

using ISACLK and ISACLKX2 as the input selec-

tion strobes.

DREQ_MUX[1:0]

ISA Bus Multiplexed DMA Re-

quest. These are the ISA bus DMA request sig-

nals. They are to be encoded before connection to

the

STPC

Consumer

using

ISACLK

and

ISACLKX2 as the input selection strobes.

DACK_ENC[2:0]

DMA Acknowledge. These are

the ISA bus DMA acknowledge signals. They are

encoded by the STPC Consumer before output

and should be decoded externally using ISACLK

and ISACLKX2 as the control strobes.

ISA Terminal Count. This is the terminal count

output of the DMA controller and is connected to

the TC line of the ISA bus. It is asserted during the

last DMA transfer, when the byte count expires.

SPKRD

Speaker Drive. This the output to the

speaker and is AND of the counter 2 output with

bit 1 of Port 61, and drives an external speaker

driver. This output should be connected to 7407

type high voltage driver.

2.2.11 X-Bus Interface pins / IDE Data

RMRTCCS# / DD[15]

ROM/Real Time clock chip

select. This pin is a multi-function pin. When

ISAOE# is active, this signal is used as RM-

RTCCS#. This signal is asserted if a ROM access

is decoded during a memory cycle. It should be

combined with MEMR# or MEMW# signals to

properly access the ROM. During a IO cycle, this

signal is asserted if access to the Real Time Clock

(RTC) is decoded. It should be combined with IOR

or IOW# signals to properly access the real time

clock.

When ISAOE# is inactive, this signal is used as

IDE DD[15] signal.

This signal must be ORed externally with ISAOE#

and is then connected to ROM and RTC. An

LS244 or equivalent function can be used if OE# is

connected to ISAOE# and the output is provided

with a weak pull-up resistor.

KBCS# / DD[14]

Keyboard Chip Select. This pin

is a multi-function pin. When ISAOE# is active,

this signal is used as KBCS#. This signal is assert-

ed if a keyboard access is decoded during a I/O

cycle.

When ISAOE# is inactive, this signal is used as

IDE DD[14] signal.

This signal must be ORed externally with ISAOE#

and is then connected to keyboard. An LS244 or

equivalent function can be used if OE# is connect-

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