29C516E
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
Syndrome Bit SY[..]
5
4
Hex
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
N.E.D
MC0
MC1
D
MC2
D
D
M
MC3
D
D
MD4
D
MD0
MD1
D
MC4
D
D
MD8
D
MD5
MD9
D
D
M
MD10
D
MD2
D
D
M
MC5
D
D
MD6
D
MD12
M
D
D
MD13
MD14
D
MD3
D
D
M
D
MD7
MD11
D
MD15
D
D
M
M
D
D
M
D
M
M
D
0
0
0
1
0
1
2
1
0
3
1
1
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
6
Rev.
E
(03
2007)
ATMEL [ ATMEL CORPORATION ]
