IDT49C466A Просмотр технического описания (PDF) - Integrated Device Technology
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IDT49C466A Datasheet PDF : 27 Pages
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IDT49C466/A Flow-thruEDC™
ERROR DETECTION AND CORRECTION UNIT
COMMERCIAL TEMPERATURE RANGES
DETAILED DESCRIPTION —
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
Generated
Participating Data Bits
2617 tbl 03
Checkbits
CB0
CB1
Parity
Even (XOR)
Even (XOR)
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
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)
CB7
Even (XOR)
XXXXXXXX
XXXXXXXX
2617 tbl 04
Generated
Checkbits
CB0
Parity
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
CB1
Even (XOR)
XXX
X
X
X
X
X
CB2
Odd (XNOR)
X
XX
X
XX
X
X
CB3
Odd (XNOR)
XX
XXX
CB4
Even (XOR)
XXXXXX
XXX
XX
CB5
CB6
CB7
Generated
Checkbits
Even (XOR)
Even (XOR)
Even (XOR)
Parity
XXXXXXXX
XXXXXXXX
XXXXXXXX
2617 tbl 05
Participating Data Bits
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)
CB5
Even (XOR)
XXXXXX
XX
XXXXXXXX
CB6
Even (XOR)
XXXXXXXX
CB7
Even (XOR)
XXXXXXXX
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.
11.7
6
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