MiTAC MiNote 7321, Руководство по обслуживанию

Страница: 93 / 192

92
7321 N/B Maintenance 7321 N/B Maintenance
5.3 VIA VT8231 BGA PCI-LPC/ISA South Bridge
Serial Port and Infrared Interface
Signal Name PIN # I/O Signal Description
TXD B15 O Transmit Data. Serial port transmit data out.
RXD
E14 I
Receive Data.
Serial port receive data in.
IRTX / GPO14 R8 O / O Infrared Transmit. IR transmit data out (Function 4 RxE5[5]
= 0) selectable from serial port 1, 2, or 3.
IRRX / GPO15 U8 I / O Infrared Receive. IR receive data in (Function 4 RxE5[5] =
0) selectable to serial port 1, 2, or 3.
IRRX2
/ GPIOB T8 I
Infrared Receive.
IR receive data in (see FIR I/O Rx33 and
34)
RTS#
A15 O
Request To Send.
Indicator that the serial output port is ready
to transmit data. Typically used as hardware handshake with
CTS# for low level flow control. Designed for direct input to
external RS-232C driver.
CTS#
B16 I
Clear To Send.
Indicator to the serial port that an external
communications device is ready to receive data. Typically
used as hardware handshake with RTS# for low level flow
control. Designed for input from external RS-232C receiver.
DTR#
A16 O
Data Terminal Ready.
Indicator that serial port is powered,
initialized, and ready. Typically used as hardware handshake
with DSR# for overall readiness to communicate. Designed
for direct input to external RS-232C driver.
DSR# D14 I Data Set Ready. Indicator to serial port that an external serial
communications device is powered, initialized, and ready.
Typically used as hardware handshake with DTR# for overall
readiness to communicate. Designed for direct input from
external RS-232C receiver.
DCD# D15 I Data Carrier Detect. Indicator to serial port that an external
modem is detecting a carrier signal (i.e., a communications
channel is currently open). In direct connect environments,
this input will typically be driven by DTR# as part of the
DTR/DSR handshake. Designed for direct input from external
RS-232C receiver.
RI#
C16 I
Ring Indicator.
Indicator to serial port that an external
modem is detecting a ring condition. Used by software to
initiate operations to answer and open the communications
channel. Designed for direct input from external RS-232C
receiver (whose input is typically not connected in direct
connect environments).
Conventional BIOS ROM / ISA Bus Interface
Signal Name PIN # I/O Signal Description
LA21 / USBOC3#
/ GPI21/ GPO21
LA20 / USBOC2#
/ GPI20/ GPO20
Y13
W13
O
O
System Address Bus (Device 0 Function 4
RxE4[6] = 1). Allows access to physical memory
devices (e.g., BIOS ROMs) up to 4 Mbytes.
SA[19:18],
SA17
/ strap,
SA16
/ strap,
SA[15:0] /
SDD[15:0]
V13, U13,
T13,
Y14,
W18, V17, Y17, 16,
V15, Y15, W14, 15,
U15, U16, V14, 15,
Y16, V16, W17, Y18
IO System Address Bus . These address lines are used
to interface to BIOS ROMs but may also be used
to implement a subset of the ISA bus if required.
SA[19-16] are connected to ISA bus SA[19-16]
directly. SA[19-17] are also connected to
LA[19-17] of the ISA bus.
SA17 strap – 0/1 = Enable / Disable Auto Reboot
SA16 strap – 0/1 = Disable / Enable LPC ROM
SD[7-0]
T11, R11, U11, U12,
Y12, W12, V12, R12 IO
System Data.
SD[7:0] provide the data path for
BIOS ROMs and other 8-bit devices residing on
the ISA bus.
IOR# / GPI22/
GPO22
U7 IO I/O Read (F4 RxE4[7] = 1). IOR# is the command
to an ISA I/O slave device that the slave may drive
data on to the ISA data bus.
IOW#
/ GPI23/
GPO23
T7 IO
I/O Write
(F4 RxE4[7] = 1). IOW# is the
command to an ISA I/O slave device that the slave
may latch data from the ISA data bus.
MEMR# W9 IO Memory Read. MEMR# is the command to a
memory slave that it may drive data onto the ISA
data bus.
MEMW# Y9 IO Memory Write. MEMW# is the command to a
memory slave that it may latch data from the ISA
data bus.
IRQ1 / MSCK N2 I Interrupt 1 (optional external Keyboard
Controller).
IRQ12 / MSDT N4 I Interrupt 12 (optional external PS2 Mouse
Controller).
IRQ14 T14 I Interrupt 14 (IDE Primary Channel).
IRQ15 U14 I Interrupt 15 (IDE Secondary Channel).
SPKR U9 O Speaker Drive. Output of internal timer/counter 2.
5. Pin Descriptions of Major Components