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IDT49C465 Datasheet(PDF) 13 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) 13 Page - Integrated Device Technology

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11.7
13
IDT49C465/A
32-BIT FLOW-THRU ERROR DETECTION AND CORRECTION UNIT
MILITARY AND COMMERCIAL TEMPERATURE RANGES
32-BIT DATA WORD CONFIGURATION
A single IDT49C465 EDC unit, connected as shown below,
provides all the logic needed for single-bit error correction,
and double-bit error detection, of a 32-bit data field. The
identification code (00) indicates 7 checkbits are required.
The CBI7 pin should be tied high.
The 39-bit data format for four bytes of data and 7 checkbits
is indicated below.
Syndrome bits are generated by an exclusive-OR of the
generated checkbits with the checkbits read from memory.
For example, Sn is the XOR of checkbits from those read with
those generated. During Data Correction, the syndrome bits
are used to complement (correct) single-bit errors in the data
bits.
32-BIT DATA FORMAT
32-BIT HARDWARE CONFIGURATION
BYTE 3
BYTE 2
BYTE 1
BYTE 0
DATA
CHECKBITS
C0
C1
C2
C3
C4
C5
C6
0
8 7
16 15
24 23
31
2552 drw 15
PCBI0–7
CBI7
CBI0–6
CBO0–6
SYO0–6
ERR
MERR
MD0–31
P0–3
SD0–31
SYNDROME–OUT
MEMORY DATA I/O
CHECKBITS–OUT
CHECKBITS–IN
SYSTEM DATA I/O
CODE ID 1,0 = 00
VCC
7
8
32
32
7
7
IDT49C465
2552 drw 16


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