October 2002
Intermediate to advanced
430 pages
14h 57m
English
Content preview from Embedded Systems Design, 2nd Edition
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Memory systems 85
30 and 72 pin SIMMs
The older 30 pin SIMMs are normally used in pairs for a 16
bit processor bus (80386SX, MC68000) and in fours for 32 bit buses
(80386DX, 80486, MC68030, MC68040) while the 72 pin SIMMs are
normally added singly although some higher performance boards
need a pair of 72 pin SIMMs to support bank switching.
SIP
This is the same idea as SIMM, except that the finger
connections are replaced by a single row of pins. SIP has been
overtaken by SIMM in terms of popularity and is now rarely seen.
DRAM interfaces
The basic DRAM interface
The basic DRAM interface takes the processor generated
address, places the high order bits onto ...
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