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參數(shù)資料
| 型號： | AM79C974KCW |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems |
| 中文描述： | 2 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP132 |
| 封裝： | PLASTIC, QFP-132 |
| 文件頁數(shù)： | 131/153頁 |
| 文件大?。?/td> | 838K |
| 代理商： | AM79C974KCW |
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131
Am79C974
Designing a Single Motherboard for AMD
PCI Family
APPENDIX F
Three devices in the AMD PCI family, the Am53C974,
the Am79C970, and the Am79C794, were designed
with very similar pin assignments so that a single mothe-
rboard design could be used for three different prod-
ucts: one with a built-in SCSI controller, one with a
built-in Ethernet controller, and one with both a SCSI
controller and an Ethernet controller. This discussion
describes some implementation details.
Pin Out Differences
The table below shows the pins that are not the same on
the three devices. All pins that are shown as NC are not
bonded to the die inside the device package. These pins
can be driven by any signal without affecting the opera-
tion of the device. Those pins that are shown in the PCI
family data sheets as RESERVED are connected to test
logic on the die. These pins are active only during stand-
alone chip testing, and therefore they may also be con-
nected to signals on the board without affecting the
operation of the device. On the other hand, pin 116
which is shown as RESERVED-DNC (for Do Not Con-
nect) must not be connected to anything on the board.
Am79C970 (Ethernet)
Function
RESERVED
IDSEL
RESERVED
NC
NC
Am53C974 (SCSI)
Function
IDSEL
NC
PWDN
SCSICLK1
SCSI data & parity bus
Am79C974 (Combination)
Function
IDSELA
IDSELB
PWDN
SCSICLK
SCSI data & parity bus
Pin Numbers
9
10
58
60
68, 69, 70, 71, 73,
74, 75, 77, 78
64, 65, 66, 80, 81,
83, 85, 86, 87
89, 90, 92, 93, 94, 95
97
99
101, 102, 104, 105, 106, 107
110, 111, 112, 114
NC
SCSI control lines
SCSI control lines
10Base-T lines
XTAL1
XTAL2
AUI lines
EEPROM interface &
LED pins
SLEEP
RESERVED_DNC
INTA
NC
REQ
RESERVED
GNT
NC
NC
10Base-T lines
SCSICLK
XTAL2
AUI lines
EEPROM interface &
LED pins
SLEEP
RESERVED_DNC
INTA
INTB
REQB
REQA
GNTB
GNTA
SCSICLK2
NC
NC
NC
115
116
117
118
126
127
123
124
NC
RESERVED_DNC
INTA
NC
NC
REQ
NC
GNT
INTx (Pins 117 and 118)
The Am79C970 and Am53C974 devices have only one
interrupt output, which is connected to pin 117. The
Am79C974, on the other hand, has two interrupt out-
puts:
INTA
, which is used for SCSI interrupts, is
connected to pin 117; while
INTB
, which is used for
Ethernet interrupts, is connected to pin 118. The
motherboard can connect these pins directly to dedi-
cated inputs to its interrupt controller, or it can connect
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