IDT49C465 Integrated Device Technology, Inc., IDT49C465 Datasheet - Page 13

• Manufacturer Part Number: IDT49C465
• Description: Error Detection And Correction
• Manufacturer: Integrated Device Technology, Inc.

IDT49C465/A
32-BIT FLOW-THRU ERROR DETECTION AND CORRECTION UNIT
32-BIT DATA WORD CONFIGURATION
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 seven checkbits are re-
quired. The CBI
checkbits is indicated below.
32-BIT DATA FORMAT
32-BIT HARDWARE CONFIGURATION
A single IDT49C465 EDC unit, connected as shown below,
The 39-bit data format for four bytes of data and seven
SYSTEM DATA I/O
CODE ID 1,0 = 00
V
CHECKBITS–IN
31
CC
BYTE 3
7
24 23
pin should be tied high.
BYTE 2
7
32
DATA
16 15
8
BYTE 1
PCBI
CBI
CBI
P
SD
0–3
0–31
7
0–6
0–7
8 7
IDT49C465
BYTE 0
11.7
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.
Syndrome bits are generated by an exclusive-OR of the
0
CBO
SYO
MD
MERR
MILITARY AND COMMERCIAL TEMPERATURE RANGES
ERR
0–31
0–6
0–6
C6
C5
7
7
32
C4
CHECKBITS
C3
MEMORY DATA I/O
SYNDROME–OUT
CHECKBITS–OUT
C2
C1
2552 drw 15
2552 drw 16
C0
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