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System Controller. 82C283 Datasheet |
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OPTiwww.DataSheet4U.com
®
1.0 Features
• 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)
82C283
386SX System Controller
2.0 Overview
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 con-
troller, 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 con-
troller like OPTi’s 82C206 or the 82C100 (with Dallas Semi-
conductor (DS1287).
*Rev. B only
Figure 2-1 System Block Diagram
A Bus
D Bus
DRAM
RAS, CAS, SA Bus
MA
SD Bus
386SX
387SX
A[23:0]
D[15:0]
D[15:0]
XA0
A[16:1]
GA20
A[23:17]
A[9:1]
A[23:16]
OPTi
82C283
245
(x2)
245
OPTi
82C206
SD[15:0]
SA[19:17]
SA[16:0]
LA[23:17]
XD[7:0]
SD 245
XD[7:0]
SA
ROM
8042
September 1994
OPTi Inc. · 2525 Walsh Avenue · Santa Clara, CA 95051 · (408) 980-8178
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www.DataSheet4U.com
82C283
3.0 Signal Definitions
Figure 3-1 Pin Diagram
GND
GND
MA6
MA7
MA8
MA9
MA10
RAS3#
RAS2#
RAS1#
RAS0#
CAS7#
CAS6#
CAS5#
CAS4#
CAS3#
CAS2#
CAS1#
CAS0#I
D WE#
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 GND
79 GND
78 SD8
77 SD9
76 SD10
75 SD11
74 SD12
73 SD13
72 SD14
71 SD15
70 M16#
69 XDIR#
68 OUT2
67 A23
66 A22
65 A21
64 A20
63 A19
62 A18
61 A17
60 A16
59 A15
58 A14
57 A13
56 A12
55 A11
54 A10
53 A9
52 A8
51 A7
50 A6
49 A5
48 A4
47 A3
46 A2
45 A1
44 A0
43 CLKI
42 GND
41 GND
OPTi
®
Page 2
912-3000-012
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