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82C283 Dataheets PDF



Part Number 82C283
Manufacturers Opti
Logo Opti
Description 386SX System Controller
Datasheet 82C283 Datasheet82C283 Datasheet (PDF)

www.DataSheet4U.com OPTi ® 82C283 386SX System Controller 1.0 Features 2.0 Overview • Flexible DRAM banks configuration - Supports 256K, 1M and 4M DRAM • Block interleave mode operations - Block interleaving at a block size of 512 bytes • BIOS shadow RAM - Shadow RAM for system, video and adapter BIOS • Memory remapping • Flexible multiplexed DRAM address • Programmable AT bus clock • Turbo switch • 160-pin PQFP (Plastic Quad Flat Pack) The 82C283 is a highly integrated, AT system logic.

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www.DataSheet4U.com OPTi ® 82C283 386SX System Controller 1.0 Features 2.0 Overview • Flexible DRAM banks configuration - Supports 256K, 1M and 4M DRAM • Block interleave mode operations - Block interleaving at a block size of 512 bytes • BIOS shadow RAM - Shadow RAM for system, video and adapter BIOS • Memory remapping • Flexible multiplexed DRAM address • Programmable AT bus clock • Turbo switch • 160-pin PQFP (Plastic Quad Flat Pack) The 82C283 is a highly integrated, AT system logic VLSI chip for high-end 386SX/AT systems. It integrates a local memory controller (local memory is on-board memory), AT bus controller, and data bus controller into one chip. It is designed for systems running at 16MHz, 20MHz, 25MHz, and 33MHz*. A high performance, compact 386SX/AT system is readily implemented with the 82C283 and a standard peripheral controller like OPTi’s 82C206 or the 82C100 (with Dallas Semiconductor (DS1287). *Rev. B only Figure 2-1 System Block Diagram A Bus D Bus DRAM RAS, CAS, MA SA Bus SD Bus A[23:0] 386SX D[15:0] OPTi 82C283 SD[15:0] SA[19:17] SD 245 XD[7:0] D[15:0] 387SX A[16:1] XA0 245 (x2) SA[16:0] SA ROM GA20 A[23:17] 245 LA[23:17] A[9:1] A[23:16] OPTi 82C206 XD[7:0] 8042 September 1994 OPTi Inc. · 2525 Walsh Avenue · Santa Clara, CA 95051 · (408) 980-8178 www.DataSheet4U.com 82C283 3.0 Signal Definitions Pin Diagram Figure 3-1 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 VCC MA5 MA4 MA3 MA2 MA1 MA0 HRQ DMA8# DMA16# HLDA1 IO16# ASRTC ALE KBDCS# XA0 OSC12 RFSH# ATCLK GND VCC GND SBHE# MEMRD# MEMWR# IORD# IOWR# INTA# PWRGD# BUFCON# SYSRST SD0 SD1 SD2 SD3 SD4 SD5 SD6 SD7 VCC GND GND MA6 MA7 MA8 MA9 MA10 RAS3# RAS2# RAS1# RAS0# CAS7# CAS6# CAS5# CAS4# CAS3# CAS2# CAS1# CAS0#I DWE# ROMCS# CHCK# CHRDY PREQI PREQO SPKD GATE2 TURBO MP0 MP1 D0 D1 D2 D3 D4 D5 D6 D7 GND GND 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 82C283 System Controller 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 GND GND SD8 SD9 SD10 SD11 SD12 SD13 SD14 SD15 M16# XDIR# OUT2 A23 A22 A21 A20 A19 A18 A17 A16 A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 CLKI GND GND OPTi Page 2 ® VCC D8 D9 D10 D11 D12 D13 D14 D15 HLDA HOLD ADS# MIO# DC# WR# RDY# BHE# OSC GND VCC GND PCLK2 NMI CPURST SMWR# GA20 BUSY# NPINT NPERR# NPBUSY# NPRST RDYI# NA# SMRD# ADS16 ADS8 SA19 SA18 SA17 VCC 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 34 35 36 37 38 39 40 912-3000-012 www.DataSheet4U.com 82C283 Table 3-1 Pin No. 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 34 35 36 37 38 39 40 Numerical Pin Cross-Reference List Pin Name VCC D8 D9 D10 D11 D12 D13 D14 D15 HLDA HOLD ADS# MIO# DC# WR# RDY# BHE# OSC GND VCC GND PCLK2 NMI CPURST SMWR# GA20 BUSY# NPINT NPERR# NPBUSY# NPRST RDYI# NA# SMRD# ADS16 ADS8 SA19 SA18 SA17 VCC Pin No. 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 67 68 69 70 71 72 73 74 75 76 77 78 79 80 Pin Name GND GND CLKI A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 A22 A23 OUT2 XDIR# M16# SD15 SD14 SD13 SD12 SD11 SD10 SD9 SD8 GND GND Pin No. 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 Pin Name VCC SD7 SD6 SD5 SD4 SD3 SD2 SD1 SD0 SYSRST BUFCON# PRWGD# INTA# IOWR# IORD# MEMWR# MEMRD# SBHE# GND VCC GND ATCLK RFSH# OSC12 XA0 KBDCS# ALE ASRTC IO16# HLDA1 DMA16# DMA8# HRQ MA0 MA1 MA2 MA3 MA4 MA5 VCC Pin No. 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 Pin Name GND GND MA6 MA7 MA8 MA9 MA10 RAS3# RAS2# RAS1# RAS0# CAS7# CAS6# CAS5# CAS4# CAS3# CAS2# CAS1# CAS0# DWE# ROMCS# CHCK# CHRDY PREQI PREQO SPKD GATE2 TURBO MP0 MP1 D0 D1 D2 D3 D4 D5 D6 D7 GND GND OPTi 912-3000-012 ® Page 3 www.DataSheet4U.com 82C283 Table 3-2 Pin Name A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 A22 A23 ADS# ADS8 ADS16 ALE ASRTC ATCLK BHE# BUFCON# BUSY# CAS0# CAS1# CAS2# CAS3# CAS4# CAS5# CAS6# Alphabetical Pin Cross Reference List Pin No. 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 12 36 35 107 108 102 17 91 27 139 138 137 136 135 134 133 Pin Name CAS7# CHCK# CHRDY CLKI CPURST D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 DC# DMA8# DAM16# DWE# GA20 GATE2 GND GND GND GND GND GND GND GND GND GND GND GND HLDA Pin No. 132 142 143 43 24 151 152 153 154 155 156 157 158 2 3 4 5 6 7 8 9 14 112 111 140 26 147 19 21 41 42 79 80 99 101 121 122 159 160 10 Pin Name HLDA1 HOLD HRQ INTA# IO16# IORD# IOWR# KBDCS# M16# MA0 MA1 MA2 MA3 MA4 .


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