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Datasheet: AM53C974 (Advanced Micro Systems)

Pscsi(tm) Bus Mastering Fast Scsi Controller For Pci Systems

 

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Publication# 18248
Rev. B
Amendment /0
Issue Date: November 1993
This document contains information on a product under development at Advanced Micro Devices, Inc. The information is intended
to help you to evaluate this product. AMD reserves the right to change or discontinue work on this proposed product without notice.
Advanced
Micro
Devices
Am53C974
PC
SCSI
TM
Bus Mastering Fast SCSI Controller for PCI Systems
PRELIMINARY
DISTINCTIVE CHARACTERISTICS
PCI Features
s
Compatible with PCI Specification Revision 2.0
s
Direct glueless interface to 33 MHz, 32-bit
PCI bus
s
Bus Mastering DMA engine
(32-bit address/data)
s
132 Mbyte/s burst DMA transfer rate
s
Support for Scatter-Gather DMA data transfers
s
96-byte DMA FIFO for low bus latency
SCSI Features
s
Fast 8-bit SCSI-2 10 Mbyte/s synchronous
or 7 Mbyte/s asynchronous data transfer rate
s
On-chip state machine to control the SCSI
sequences in hardware
s
Patented programmable GLITCH EATER
TM
Circuitry on
REQ
and
ACK
and data inputs
s
Programmable Active Negation on
REQ
,
ACK
and data outputs
s
Integrated industry standard Fast SCSI-2 core
s
Single-Ended 48 mA outputs to drive the SCSI
bus directly
General Features
s
Complete software driver support for all major
PC operating systems
s
Plug-in and software compatible with AMD's
PCI product family of SCSI and Ethernet
controllers
s
Hooks in silicon and software to enable disk
drive spin down for power savings
s
Fully static design for low frequency and
power operation
s
132-pin PQFP package
s
State of the art Am386
submicron CMOS
process technology
GENERAL DESCRIPTION
The Am53C974, PC
SCSI
, is a high-performance Fast
SCSI controller with a glueless interface to the PCI local
bus. The Am53C974 integrates a 32-bit bus mastering
DMA engine with an industry standard Fast SCSI-2
block. The DMA engine and accompanying 96 byte
DMA FIFO allow 32-bit burst data transfers across the
high bandwidth PCI bus at speeds of up to 132 Mbyte/s.
Full support for scatter-gather DMA transfers optimize
performance in multi-tasking system applications.
The Am53C974's on-chip state machine controls SCSI
bus sequences in hardware and is coupled with the bus
mastering DMA engine to eliminate the need for an on-
chip RISC processor. This results in a smaller die size
giving the Am53C974 superior price/performance ver-
sus competitive offerings. For more detailed information
refer to the technical manual, PID #18264B.
AMD supports the Am53C974 with a total system solu-
tion which includes:
A full suite of licensable SCSI drivers and utilities
fully tested under the following operating system
environments:
DOS 5.0 6.0
Windows 3.1
Windows NT
OS/2 2.x
Netware 3.x, 4.x
SCO Unix 3.2.4, ODT 2.0
An INT13h Compatible SCSI ROM BIOS
ASPI Compatibility
Complete hardware reference design kit
The Am53C974 is part of AMD's PCI product family of
plug-in and software compatible SCSI and Ethernet
controllers. This product compatibility ensures a low
cost system upgrade path and lower motherboard
manufacturing costs.
AMD
P R E L I M I N A R Y
2
Am53C974
BLOCK DIAGRAM
18248B-1
Fast SCSI Block
Data
CNTL
DREQ
DACK
DMA
Engine
PCI Bus Interface Unit
Data
CNTL
PCI^REQ
PCI^GNT
ADDR
CNTL
CPU
Control
Address
Data
Core
Logic
PCI
to
ISA
Cache
SRAM
DRAM
Memory
PC
SCSI
(Am53C974)
PCnet
TM
-PCI
(Am79C970)
Video
Control
PC-AT ISA Bus
Super I/O
IDE/Floppy
Ser/Par
Keyboard
Control
18248B-2
PCI Bus
Am53C974 in a PCI System
P R E L I M I N A R Y
AMD
3
Am53C974
RELATED AMD PRODUCTS
Part No.
Description
Am33C93A
Synchronous SCSI Controller
Am386
High-Performance 32-Bit Microprocessor
Am486
TM
High-Performance 32-Bit Microprocessor
Am53C94/96
High-Performance SCSI Controller
Am53CF94/96
Enhanced Fast SCSI-2 Controller
Am79C960
PCnet-ISA Single-Chip Ethernet Controller
Am79C961
PCnet-ISA
+
Single-Chip Ethernet Controller
Am79C965
PCnet-32 Single-Chip 32-Bit Ethernet Controller
Am79C970
PCnet-PCI Single-Chip Ethernet Controller for PCI Local Bus
Am85C30
Enhanced Serial Communication Controller
AMD
P R E L I M I N A R Y
4
Am53C974
CONNECTION DIAGRAM
Top View
Notes:
Pin 1 is marked for orientation.
NC =
Not connected; connection of an NC pin may cause a malfunction or incompatibility with other products.
RES_DNC = Reserved_DO NOT CONNECT.
18248B-3
132
1
AD28
AD29
131
V
SS3B
130
AD30
129
AD31
128
PCI^REQ
127
NC
126
V
SS
125
PCI^GNT
124
NC
123
V
DD
122
CLK
121
PCI^RST
120
V
SS
119
NC
118
INTA
117
RES_DNC
116
NC
115
NC
114
V
SS
113
NC
112
NC
111
NC
110
V
DD
109
V
DD
108
NC
107
NC
106
NC
105
NC
104
V
DD
103
NC
102
NC
101
V
SS
100
NC
99
V
SS
98
SCSICLK2
97
V
DD
96
NC
95
NC
94
NC
93
NC
92
V
DD
91
NC
90
NC
89
V
SS
88
I/O
87
C/D
86
MSG
85
V
DD
84
ACK
83
V
SSB
82
REQ
81
SEL
80
V
SS
79
SD
P
78
SD
7
77
V
DDB
76
SD
6
75
SD
5
74
SD
4
73
V
SSB
72
SD
3
71
SD
2
70
SD
1
69
SD
0
68
V
SSB
67
34
PAR
35
C/
BE
1
36
AD15
37
V
SS3B
38
AD14
39
AD13
40
AD12
41
AD11
42
AD10
43
V
SS3B
44
AD9
45
AD8
46
V
DD3B
47
C/
BE
0
48
AD7
49
AD6
50
V
SS3B
51
AD5
52
AD4
53
AD3
54
AD2
55
V
SS3B
56
AD1
57
AD0
58
59
V
DD
60
SCSICLK1
61
V
SS
62
BUSY
63
V
SS
64
BSY
65
ATN
66
SCSI^RST
V
DD3B
2
AD27
3
AD26
4
V
SS3B
5
AD25
6
AD24
7
C/
BE
3
8
V
DD
9
IDSEL
10
NC
11
V
SS
12
AD23
13
AD22
14
V
SS3B
15
AD21
16
AD20
17
V
DD3B
18
AD19
19
AD18
20
V
SS3B
21
AD17
22
AD16
23
C/
BE
2
24
FRAME
25
IRDY
26
TRDY
27
DEVSEL
28
STOP
29
LOCK
30
V
SS
31
PERR
32
SERR
33
V
DD3B
PWDN
PC
SCSI
(Am53C974)
P R E L I M I N A R Y
AMD
5
Am53C974
QUICK REFERENCE PIN DESCRIPTIONS
Pin Name
Pin Type
Description
PCI
AD [31:00]
IN/OUT
Address/Data Bus
C/
BE
[3:0]
IN/OUT
Command/Byte Enable signals
PAR
IN/OUT
Parity Signal
FRAME
IN/OUT
Cycle Frame
TRDY
IN/OUT
Target Ready
IRDY
IN/OUT
Initiator Ready
STOP
IN/OUT
Stop
LOCK
IN/OUT
Lock
IDSEL
IN
Initialization Device Select
DEVSEL
IN/OUT
Device Select
PCI^REQ
OUT
PCI Request
PCI^GNT
IN
PCI Grant
CLK
IN
PCI Clock
PCI^RST
IN
PCI Reset
PERR
IN/OUT
Parity Error
SERR
OUT
System Error
INTA
OUT
Interrupt
SCSI Interface
SD
[7:0]
IN/OUT
SCSI Data
SD
P
IN/OUT
SCSI Data Parity
MSG
IN
Message
C/D
IN
Command/Data
I/O
IN
Input/Output
ATN
OUT
Attention
BSY
IN/OUT
Busy
SEL
IN/OUT
Select
SCSI^RST
IN/OUT
SCSI Bus Reset
REQ
IN
Request
ACK
OUT
Acknowledge
Miscellaneous
SCSI CLK1
IN
SCSI Core Clock
SCSI CLK2
IN
Chip Reset Clock
RES_DNC
IN
Reserved, DO NOT CONNECT
Power Management
PWDN
IN
Power Down Indicator
BUSY
OUT
SCSI Bus Activity Pin
Power Supply
V
DD
+5 V
V
SS
GND
V
DDB
+5 V (Buffer)
V
SSB
GND (Buffer)
V
DD3B
+5 V (PCI)
V
SS3B
GND (5 V PCI)
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