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29C516E Datasheet(PDF) 6 Page - ATMEL Corporation

Part No. 29C516E
Description  16 Bit Flow Through EDAC Error Detection And Correction unit
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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29C516E Datasheet(HTML) 6 Page - ATMEL Corporation

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29C516E
6
Rev. D (09 Dec. 97)
6. Syndrome Decoding
The syndrome decoder generates the error flags CERR
(Correctable ERRor) and NCERR (Non–Correctable
ERRor). If a correctable error occurs, the 29C516E
EDAC provides corrected data to the user. The inputs are
the 8 syndrome bits from the syndrome generator, the 16
data bits from the memory and the control signal N22.
N22 signal controls if 22 or 24 bits shall be decode from
the entire memory word.
Table 4: 6–Bit Syndrome Word to Bit–In–Error (N22=”1”)
Hex
0
1
2
3
Syndrome Bit SY
[..]
5
0
0
1
1
4
0
1
0
1
Hex
3
2
1
0
0
0
0
0
0
N.E.D
MC4
MC5
D
1
0
0
0
1
MC0
D
D
MD7
2
0
0
1
0
MC1
D
D
MD11
3
0
0
1
1
D
MD8
MD6
D
4
0
1
0
0
MC2
D
D
MD15
5
0
1
0
1
D
MD5
MD12
D
6
0
1
1
0
D
MD9
M
D
7
0
1
1
1
M
D
D
M
8
1
0
0
0
MC3
D
D
M
9
1
0
0
1
D
M
MD13
D
A
1
0
1
0
D
MD10
MD14
D
B
1
0
1
1
MD4
D
D
M
C
1
1
0
0
D
MD2
MD3
D
D
1
1
0
1
MD0
D
D
M
E
1
1
1
0
MD1
D
D
M
F
1
1
1
1
D
M
M
D
Note :
N.E.D = No Errors Detected
MDx = Memory Data Bit–In–Error
MCx = Memory Check Bit–In–Error
D = Double–Bit–In–Error Detected
M = Multi–Bit–In–Error Detected


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