參數(shù)資料
型號(hào)： PCT789T-A
英文描述： PCI HSP56 World MicroModem/PCT303DW/PCT1789W
中文描述： 世界MicroModem/PCT303DW/PCT1789W的PCI HSP56
文件頁(yè)數(shù)： 12/70頁(yè)
文件大?。?/td> 872K
代理商： PCT789T-A
PC-TEL, Inc.
12
1789W0DOCDAT06A-0299
PCT1789W DATA SHEET
PCT789T-A P
IN
D
ESCRIPTION
!
PRELIMINARY
PRELIMINARY
OCS*
49
O
4mA
Chip select for companion chip. Any base I/O access to the PCT789T-A
is direct to the companion chip also, if any, through this pin.
External IRQ input. The interrupt request from the companion chip can
be routed through this input to the host bus.
Terminals to connect to external crystal. These pins are the two termi-
nals of the on-chip oscillator circuit to which a quartz crystal should be
attached to provide the fundamental clock for generating oversampling
clock for the AFE. The recommended frequency of the quartz crystal is
18.432MHz with ± 50ppm frequency tolerance at room temperature.
Master clock. This pin provides the master clock to drive external AFE.
General-purpose output bit 4. In normal operating mode, this pin
reflects bit 4 of the external output register.
General-purpose output bit 5. In normal operating mode, this pin
reflects bit 5 of the external output register.
General-purpose output bit 6. In normal operating mode, this pin
reflects bit 6 of the external output register.
General-purpose output bit 7. In normal operating mode, this pin
reflects bit 7 of the external output register.
Auxiliary power detection. Detects the presence of 3.3Vaux.
Operating mode selection. These input pins are used for setting the
operation mode of the PCT789T-A.
Subsystem vendor ID selection. These input pins are used for selecting
one of the 16 preselected subsystem vendor IDs to be initialized into
PCI Configuration register 2Ch at power-up. Refer to the PCI configura-
tion register definition section for a detailed list.
Device ID selection. The logic state of these input pins is latched into
bits [2:0] of the PCI device ID field in PCI Configuration register 00h dur-
ing the power-on reset period. It is used for product differentiation.
IXIRQ
67
I
PU
IMCLKIN,
OMCLKOUT
42,
43
I
O
OMCLK
OUT[4]
48
47
O
O
4mA
4mA
PU
4mA
PU
4mA
PU
4mA
PU
PD
PU
OUT[5]
46
O
OUT[6]
45
O
OUT[7]
44
O
VAUXDET
IMODE[2:0]
54
I
I
65-63
ISVID[3:0]
62-59
I
PD
IDID[2:0]
58-56
I
PD
Serial EEPROM Interface Signals
OEEPCK
52
O
4mA
EEPROM Clock. For providing clock signal for accessing off-chip serial
EEPROM which stored the resource information of a PCI card.
EEPROM Chip Select. Provides the chip enable signal for the external
serial EEPROM.
EEPROM Data I/O. Provides the serial data gateway for the external
serial EEPROM.
OEEPCS
53
O
4mA
BEEPD
51
I/O
4mA
Power and Ground Pins
DVDD
16, 38, 68,
85
9, 21, 41,
39, 50, 69,
95
P
Positive digital power supply (3.3V ± 5%)
DVSS
G
Digital ground (0V)
Table 3 PCT789T-A Pin Description (Continued)
Name
Numbers
I/O
Typ
e
Description
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