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AM79C974 Datasheet(PDF) 17 Page - Advanced Micro Devices

Part # AM79C974
Description  PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
PDF  153 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C974 Datasheet(HTML) 17 Page - Advanced Micro Devices

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P R E L I M I N A R Y
AMD
17
Am79C974
PIN DESIGNATIONS (continued)
Quick Reference Pin Description
Pin Name
Description
Type
Driver
# Pins
SCSI SPECIFIC
SCSI Interface
SD [7:0]
SCSI Data
IO
OD48
8
SDP
SCSI Data Parity
IO
OD48
1
MSG
Message
I
1
C/D
Command/Data
I
1
I/O
Input/Output
I
1
ATN
Attention
O
OD48
1
BSY
Busy
IO
OD48
1
SEL
Select
IO
OD48
1
SCSI^RST
SCSI Bus Reset
IO
OD48
1
REQ
Request
I
1
ACK
Acknowledge
O
OD48
1
Miscellaneous
SCSI CLK
SCSI Core Clock
I
1
RESERVE
Reserved, DO NOT CONNECT
I
1
Power Management
PWDN
Power Down Indicator
I
1
Test Interface
BUSY
NAND Tree Test Output
O
O3
1
Power Supplies
AVDD
Analog Power
P
NA
4
AVSS
Analog Ground
P
NA
2
VDD/DVDD
Digital Power
P
NA
5
VSS/DVSS
Digital Ground
P
NA
9
VDDB/VDDBS
I/O Buffer Power
P
NA
5
VSSB/VSSBS
I/O Buffer Ground
P
NA
11
Listed by Driver Type
The following table describes the various types of drivers that are implemented in the PCnet-SCSI controller. Current
is given as milliamperes:
Name
Type
IOL (mA)
IOH (mA)
pF
TS3
Tri-State
TM
3
–2.0
50
TS6
Tri-State
6
–2.0
50
O3
Totem Pole
3
–0.4
50
O6
Totem Pole
6
–0.4
50
O8
Totem Pole
8
–0.4
50
OD6
Open Drain
6
NA
50
OD48
Open Drain
48
NA
—
LED
LED
12
–0.4
50



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