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74F632QC датащи(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали 74F632QC
подробное описание детали  32-Bit Parallel Error Detection and Correction Circuit
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

74F632QC датащи(HTML) 5 Page - National Semiconductor (TI)

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Functional Description (Continued)
TABLE IV Read Flag and Correct Function
Memory
EDAC
Control
DB Control
DB Output
CB
Error Flags
Cycle
Function
S1
S0
Data IO
OEBn
Latch
Check IO
Control
ERR
MERR
LEDBO
OECB
Read
Read
Flag
H
L
Input
H
X
Input
H
Enabled (Note 1)
Read
Latch Input
Latched
Latched
Data
Check
H
H
Input
H
L
Input
H
Enabled (Note 1)
Bits
Data
Check Word
Read
Output
Output
Output
Corrected Data
H
H
Corrected
L
X
Syndrome
L
Enabled (Note 1)
Syndrome Bits
Data Word
Bits (Note 2)
Note 1
See Table III for error description
Note 2
See Table V for error location
TABLE V Syndrome Decoding
Syndrome Bits
Error
654
3
210
LLL
L
LLL
unc
L
L
L
L
L
L
H
2-Bit
L
L
L
L
L
H
L
2-Bit
LLL
L
L
H
H
unc
L
L
L
L
H
L
L
2-Bit
LLL
L
H
L
H
unc
LLL
L
H
H
L
unc
L
L
L
L
H
H
H
2-Bit (Note 2)
L
L
L
H
L
L
L
2-Bit
LLL
H
L
L
H
unc
LLL
H
L
H
L
DB31
L
L
L
H
L
H
H
2-Bit
LLL
H
H
LL
unc
L
L
L
H
H
L
H
2-Bit
L
L
L
H
H
H
L
2-Bit
LLL
H
H
H
H
DB30
L
L
H
L
L
L
L
2-Bit
LL
H
L
LL
H
unc
L
L
H
L
LHL
DB29
L
L
H
L
L
H
H
2-Bit
LL
H
L
H
L
L
DB28
L
L
H
L
H
L
H
2-Bit
L
L
H
L
H
H
L
2-Bit
L
L
H
L
HHH
DB27
LL
H
H
LLL
DB26
L
L
H
H
L
L
H
2-Bit
L
L
H
H
L
H
L
2-Bit
LL
H
H
L
H
H
DB25
L
L
H
H
H
L
L
2-Bit
L
L
H
H
HLH
DB24
L
L
H
H
H
H
L
unc
L
L
H
H
H
H
H
2-Bit
Syndrome Bits
Error
654
3
2
10
L
H
L
L
L
L
L
2-Bit
LHL
L
L
LH
unc
LHL
L
L
HL
DB7
L
H
L
L
L
H
H
2-Bit
LHL
L
HL
L
DB6
L
H
L
L
H
L
H
2-Bit
L
H
L
L
H
H
L
2-Bit
LHL
L
H
H
H
DB5
L
H
LHL
L
L
DB4
L
H
L
H
L
L
H
2-Bit
L
H
L
H
L
H
L
2-Bit
L
H
LHL
H
H
DB3
L
H
L
H
H
L
L
2-Bit
LHL
H
HLH
DB2
L
H
L
H
H
H
L
unc
L
H
L
H
H
H
H
2-Bit
LH
H
L
L
L
L
DB0
L
H
H
L
L
L
H
2-Bit
L
H
H
L
L
H
L
2-Bit
L
H
H
L
L
H
H
unc
L
H
H
L
H
L
L
2-Bit
LH
H
L
H
LH
DB1
LH
H
L
H
HL
unc
L
H
H
L
H
H
H
2-Bit
L
H
H
H
L
L
L
2-Bit
L
H
H
H
L
L
H
unc
L
H
H
H
L
H
L
unc
L
H
H
H
L
H
H
2-Bit
L
H
HHH
L
L
unc
L
H
H
H
H
L
H
2-bit
L
H
H
H
H
H
L
2-bit
L
H
HHH
H
H
CB6
CBX e Error in check bit X
DBY e Error in data bit Y
2-Bit e Double-bit error
unc e Uncorrectable multi-bit error
Note
2-bit and unc condition will cause both ERR and MERR to be LOW
Note 1
Syndrome bits for all LOWs MERR and ERR LOW for all LOWs
only ERR LOW for DB30 error
Note 2
Syndrome bits for all HIGHs
5


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