idt49c465apqfb Integrated Device Technology, idt49c465apqfb Datasheet - Page 18

• Manufacturer Part Number: idt49c465apqfb
• Description: 32-bit Flow-thru Error Detection Correction Unit
• Manufacturer: Integrated Device Technology

IDT49C465/A
32-BIT FLOW-THRU ERROR DETECTION AND CORRECTION UNIT
DETAILED DESCRIPTION — 64-BIT CONFIGURATION
64-BIT MODIFIED HAMMING CODE - CHECKBIT ENCODING CHART
NOTES:
1. The table indicates the data bits participating in the checkbit generation. For example, checkbit C0 is the Exclusive-OR function of the 64 data input bits
2. The checkbit is generated as either an XOR or an XNOR of the 64 data bits noted by an “X” in the table.
marked with an X.
Generated
Generated
Generated
Generated
Checkbits
Checkbits
Checkbits
Checkbits
CB0
CB1
CB2
CB3
CB4
CB5
CB6
CB7
CB0
CB1
CB2
CB3
CB4
CB5
CB6
CB7
CB0
CB1
CB2
CB3
CB4
CB5
CB6
CB7
CB0
CB1
CB2
CB3
CB4
CB5
CB6
CB7
Odd (XNOR)
Odd (XNOR)
Odd (XNOR)
Odd (XNOR)
Odd (XNOR)
Odd (XNOR)
Odd (XNOR)
Odd (XNOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Parity
Parity
Parity
Parity
16
32
48
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
17
33
49
X
X
X
X
X
X
X
X
X
X
X
X
X
X
1
18
34
50
X
X
X
X
X
X
X
X
X
X
X
X
X
X
2
19
35
51
X
X
X
X
X
X
X
X
X
X
X
X
X
X
3
20
36
52
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
4
11.7
21
37
53
X
X
X
X
X
X
X
X
X
X
X
X
X
X
5
Participating Data Bits
Participating Data Bits
Participating Data Bits
Participating Data Bits
22
38
54
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
6
(1, 2)
MILITARY AND COMMERCIAL TEMPERATURE RANGES
23
39
55
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
7
24
40
56
8
X
X
X
X
X
X
X
X
X
X
X
X
X
X
25
41
57
X
X
X
X
X
X
X
X
X
X
X
X
X
X
9
10
26
42
58
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
11
27
43
59
X
X
X
X
X
X
X
X
X
X
X
X
X
X
12
28
44
60
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
29
45
61
13
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
14
30
46
62
X
X
X
X
X
X
X
X
X
X
X
X
X
X
2552 tbl 13
2552 tbl 14
2552 tbl 15
2552 tbl 16
18
15
31
47
63
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X