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参数资料
| 型号： | STPCC0175BTI3 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 75 MHz, MICROPROCESSOR, PBGA388 |
| 封装： | PLASTIC, BGA-388 |
| 文件页数： | 16/47页 |
| 文件大小： | 747K |
| 代理商： | STPCC0175BTI3 |
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PIN DESCRIPTION
23/47
Issue 1.6
PDACK#
Primary DMA Acknowledge.
DMA acknoledge 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.
3.2.10. 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 RMRTCCS#. 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 an 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 asserted 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 the
keyboard.
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.
RTCRW# / DD[13]
Real Time Clock RW.
This pin is a multi-function pin. When
ISAOE# is active, this signal is used as
RTCRW#. This signal is asserted for any
I/O write to port 71H.
When ISAOE# is inactive, this signal is
used as IDE DD[13] signal.
This signal must be ORed externally with
ISAOE# and then connected to the 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.
RTCDS# / DD[12]
Real Time Clock DS.
This pin is a multi-function pin. When
ISAOE# is active, this signal is used as
RTCDS. This signal is asserted for any I/
O read to port 71H.
When ISAOE# is inactive, this signal is
used as IDE DD[12] signal.
This signal must be ORed externally with
ISAOE# and is then connected to 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.
3.2.11. 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 Client using
ISACLK and ISACLKX2 as the input
selection strobes.
Note that IRQ8B, which by convention is
connected to the RTC, is inverted before
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