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IDT49C466 Datasheet(PDF) 6 Page - Integrated Device Technology

Part No. IDT49C466
Description  64-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

IDT49C466 Datasheet(HTML) 6 Page - Integrated Device Technology

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6
IDT49C466/A Flow-thruEDC
ERROR DETECTION AND CORRECTION UNIT
COMMERCIAL TEMPERATURE RANGES
Generated
Participating Data Bits
Checkbits
Parity
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
CB0
Even (XOR)
X
X
X
X
X
X
X
X
CB1
Even (XOR)
X
X
X
XXXXX
CB2
Odd (XNOR)
X
X
X
X
X
X
X
X
CB3
Odd (XNOR)
X
X
X
X
X
X
X
X
CB4
Even (XOR)
X
X
XXXX
X
X
CB5
Even (XOR)
XXXXXXX
X
CB6
Even (XOR)
XXXXXXX
X
CB7
Even (XOR)
XXXX
XXXX
NOTES:
2617 tbl 06
1. The table indicates the data bits participating in the checkbit generation. For example, checkbit CB0 is the Exclusive-OR function of the 64 data input bits
marked with an X.
2. The checkbit is generated as either an XOR or an XNOR of the 64 data bits noted by an “X” in the table.
DETAILED DESCRIPTION —
64-BIT MODIFIED HAMMING CODE - CHECKBIT ENCODING CHART
(1, 2)
Generated
Participating Data Bits
Checkbits
Parity
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
CB0
Even (XOR)
X
X
X
X
X
X
X
X
CB1
Even (XOR)
X
X
X
XXXXX
CB2
Odd (XNOR)
X
X
X
X
X
X
X
X
CB3
Odd (XNOR)
X
X
X
X
X
X
X
X
CB4
Even (XOR)
X
X
XXXX
X
X
CB5
Even (XOR)
XXXXXXX
X
CB6
Even (XOR)
XXXX
XXXX
CB7
Even (XOR)
XXXXXXX
X
2617 tbl 05
Generated
Participating Data Bits
Checkbits
Parity
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
CB0
Even (XOR)
X
X
X
X
X
X
X
X
CB1
Even (XOR)
X
X
X
XXXXX
CB2
Odd (XNOR)
X
X
X
X
X
X
X
X
CB3
Odd (XNOR)
X
X
X
X
X
X
X
X
CB4
Even (XOR)
X
X
XXXX
X
X
CB5
Even (XOR)
XXXXXXX
X
CB6
Even (XOR)
XXXXXXX
X
CB7
Even (XOR)
XXXXXXX
X
2617 tbl 04
Generated
Participating Data Bits
Checkbits
Parity
0123
456789
10
11
12
13
14
15
CB0
Even (XOR)
X
X
X
X
X
X
X
X
CB1
Even (XOR)
X
X
X
XXXXX
CB2
Odd (XNOR)
X
X
X
X
X
X
X
X
CB3
Odd (XNOR)
X
X
X
X
X
X
X
X
CB4
Even (XOR)
X
X
XXXX
X
X
CB5
Even (XOR)
XXXXXXX
X
CB6
Even (XOR)
XXXX
XXXX
CB7
Even (XOR)
XXXX
XXXX
2617 tbl 03


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