IDT49C465G Ver la hoja de datos (PDF) - Integrated Device Technology
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IDT49C465G Datasheet PDF : 38 Pages
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IDT49C465/A
32-BIT FLOW-THRU ERROR DETECTION AND CORRECTION UNIT
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DETAILED DESCRIPTION — 64-BIT CONFIGURATION
64-BIT MODIFIED HAMMING CODE - CHECKBIT ENCODING CHART(1, 2)
Generated
Participating Data Bits
Checkbits
Parity
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
CB0
Even (XOR)
XXX
X
XX
X
X
CB1
Even (XOR)
XXX
X
X
X
X
X
CB2
Odd (XNOR)
X
XX
X
XX
X
X
CB3
Odd (XNOR)
XX
XXX
XXX
CB4
Even (XOR)
XXXXXX
XX
CB5
Even (XOR)
XXXXXXXX
CB6
Even (XOR)
XXXXXXXX
CB7
Even (XOR)
XXXXXXXX
2552 tbl 13
Generated
Checkbits
CB0
CB1
CB2
CB3
CB4
CB5
CB6
CB7
Parity
Even (XOR)
Even (XOR)
Odd (XNOR)
Odd (XNOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Participating Data Bits
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
XXX
X
XX
X
X
XXX
X
X
X
X
X
X
XX
X
XX
X
X
XX
XXX
XXX
XXXXXX
XX
XXXXXXXX
XXXXXXXX
XXXXXXXX
2552 tbl 14
Generated
Checkbits
CB0
CB1
CB2
CB3
CB4
CB5
CB6
CB7
Parity
Even (XOR)
Even (XOR)
Odd (XNOR)
Odd (XNOR)
Even (XOR)
Even (XOR)
Even (XOR)
Even (XOR)
Participating Data Bits
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
X
X
XX
X
XX
X
XXX
X
X
X
X
X
X
XX
X
XX
X
X
XX
XXX
XXX
XXXXXX
XX
XXXXXXXX
XXXXXXXX
XXXXXXXX
2552 tbl 15
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
XX
X
XX
X
CB1
Even (XOR)
XXX
X
X
X
X
X
CB2
Odd (XNOR)
X
XX
X
XX
X
X
CB3
Odd (XNOR)
XX
XXX
XXX
CB4
Even (XOR)
XXXXXX
XX
CB5
Even (XOR)
XXXXXXXX
CB6
Even (XOR)
XXXXXXXX
CB7
Even (XOR)
XXXXXXXX
NOTES:
2552 tbl 16
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
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.
11.7
18
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