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IDT49C465 Datasheet(PDF) 12 Page - Integrated Device Technology

Part No. IDT49C465
Description  32-BIT FLOW-THRU ERROR DETECTION AND CORRECTION UNIT
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

IDT49C465 Datasheet(HTML) 12 Page - Integrated Device Technology

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11.7
12
IDT49C465/A
32-BIT FLOW-THRU ERROR DETECTION AND CORRECTION UNIT
MILITARY AND COMMERCIAL TEMPERATURE RANGES
In order to perform a partial-word-write operation,
the
complete word in question must be read from memory. This
must be done in order to correct any error which may have
occurred in the old word. Once the complete, corrected word
is available, with all the bytes verified, the new word may be
assembled in the byte mux and the new checkbits generated.
PARTIAL-WORD-WRITE OPERATIONS
FOR COMMON I/O MEMORIES:
The example shown above illustrates the case of combin-
ing 3 bytes from an old word with a new lower order byte to
form a new word. The new word, along with the new checkbits,
may now be written to memory.
In the separate I/O memory configuration, the situation is
similar except that the new word is output on the SD Bus
instead of the MD Bus (refer to previous page).
2552 drw 14
B3 = 1
B2 = 1
B1 = 1
B0 = 0
CORRECTION
BLOCK
SD BUS
BYTE 3
BYTE 2
BYTE 1
BYTE 0
BYTE 3
BYTE 2
BYTE 1
BYTE 0
MD BUS
MAIN
MEMORY
CHECKBIT
MEMORY
CHECKBIT
GENERATOR
CBO
CBI
BYTE
MUX
A0
A1
A2
A3
B0
B1
B2
B3
8
8
8
8
IDT49C465


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