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Part: AM53C974
Category:
Interface and Interconnect
-> SCSI
-> Controller
Description: Pscsi(tm) Bus Mastering Fast Scsi Controller For Pci Systems
Company: Advanced Micro Systems, Inc.
Datasheet: Download AM53C974 datasheet File size : 342 kB
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Datasheet text preview:
D
PRELIMINARY
Am53C974
PCSCSITM
Bus Mastering Fast SCSI Controller for PCI Systems
ISTINCTIVE 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
Advanced Micro Devices
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
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 EATERTM Circuitry on REQ and ACK and data inputs s Programmable Active Negation on REQ, ACK and data outputs
GENERAL DESCRIPTION
The Am53C974, PCSCSI, 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 onchip RISC processor. This results in a smaller die size giving the Am53C974 superior price/performance versus competitive offerings. For more detailed information refer to the technical manual, PID #18264B. AMD supports the Am53C974 with a total system solution 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.
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.
Publication# 18248 Rev. B Amendment /0 Issue Date: November 1993
AMD
PRELIMINARY
BLOCK DIAGRAM
Fast SCSI Block
Data CNTL DMA Engine Data CNTL
DREQ DACK ADDR CNTL PCI^REQ PCI^GNT
PCI Bus Interface Unit
18248B-1
Cache SRAM
DRAM Memory
PCSCSI (Am53C974)
PCnetTM-PCI (Am79C970)
Video Control
Control CPU Address Data Core Logic PCI Bus PCI to ISA
PC-AT ISA Bus
Super I/O IDE/Floppy Ser/Par
Keyboard Control
18248B-2
Am53C974 in a PCI System
2
Am53C974
PRELIMINARY
AMD
RELATED AMD PRODUCTS
Part No. Am33C93A Am386® Am486TM Am53C94/96 Am53CF94/96 Am79C960 Am79C961 Am79C965 Am79C970 Am85C30 Description Synchronous SCSI Controller High-Performance 32-Bit Microprocessor High-Performance 32-Bit Microprocessor High-Performance SCSI Controller Enhanced Fast SCSI-2 Controller PCnet-ISA Single-Chip Ethernet Controller PCnet-ISA+ Single-Chip Ethernet Controller PCnet-32 Single-Chip 32-Bit Ethernet Controller PCnet-PCI Single-Chip Ethernet Controller for PCI Local Bus Enhanced Serial Communication Controller
Am53C974
3
AMD
PRELIMINARY
CONNECTION DIAGRAM Top View
AD28 AD29 VSS3B AD30 AD31 PCI^REQ NC V SS PCI^GNT NC VDD CLK PCI^RST V SS NC INTA RES_DNC NC NC V SS NC NC NC VDD VDD NC NC NC NC VDD NC NC V SS VDD3B AD27 AD26 VSS3B AD25 AD24 C/BE3 VDD IDSEL NC VSS AD23 AD22 VSS3B AD21 AD20 VDD3B AD19 AD18 VSS3B AD17 AD16 C/BE2 FRAME IRDY TRDY DEVSEL STOP LOCK VSS PERR SERR VDD3B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67
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PCSCSI Am53C974)
NC VSS SCSICLK2 VDD NC NC NC NC VDD NC NC VSS I/O C/D MSG VDD ACK VSSB REQ SEL VSS SDP SD7 VDDB SD6 SD5 SD4 VSSB SD3 SD2 SD1 SD0 VSSB
PAR C/BE1 AD15 VSS3B AD14 AD13 AD12 AD11 AD10 VSS3B AD9 AD8 VDD3B C/BE0 AD7 AD6 VSS3B AD5 AD4 AD3 AD2 VSS3B AD1 AD0 PWDN VDD SCSICLK1 VSS BUSY VSS BSY ATN SCSI^RST
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66
18248B-3
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.
4
Am53C974
PRELIMINARY
AMD
QUICK REFERENCE PIN DESCRIPTIONS
Pin Name PCI AD [31:00] C/BE [3:0] PAR FRAME TRDY IRDY STOP LOCK IDSEL DEVSEL PCI^REQ PCI^GNT CLK PCI^RST PERR SERR INTA SCSI Interface SD [7:0] SDP MSG C/D I/O ATN BSY SEL SCSI^RST REQ ACK Miscellaneous SCSI CLK1 SCSI CLK2 RES_DNC Power Management PWDN BUSY Power Supply VDD VSS VDDB VSSB VDD3B VSS3B +5 V GND +5 V (Buffer) GND (Buffer) +5 V (PCI) GND (5 V PCI) IN OUT Power Down Indicator SCSI Bus Activity Pin IN IN IN SCSI Core Clock Chip Reset Clock Reserved, DO NOT CONNECT IN/OUT IN/OUT IN IN IN OUT IN/OUT IN/OUT IN/OUT IN OUT SCSI Data SCSI Data Parity Message Command/Data Input/Output Attention Busy Select SCSI Bus Reset Request Acknowledge IN/OUT IN/OUT IN/OUT IN/OUT IN/OUT IN/OUT IN/OUT IN/OUT IN IN/OUT OUT IN IN IN IN/OUT OUT OUT Address/Data Bus Command/Byte Enable signals Parity Signal Cycle Frame Target Ready Initiator Ready Stop Lock Initialization Device Select Device Select PCI Request PCI Grant PCI Clock PCI Reset Parity Error System Error Interrupt Pin Type Description
Am53C974
5
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