29C516E
6. Syndrome Decoding
The syndrome decoder generates the error flags CERR the 8 syndrome bits from the syndrome generator, the 16
(Correctable ERRor) and NCERR (Non–Correctable data bits from the memory and the control signal N22.
ERRor). If a correctable error occurs, the 29C516E N22 signal controls if 22 or 24 bits shall be decode from
EDAC provides corrected data to the user. The inputs are the entire memory word.
Table 4: 6–Bit Syndrome Word to Bit–In–Error (N22=”1”)
Hex
5
0
0
0
1
0
1
2
1
0
3
1
1
Syndrome Bit SY[..]
4
Hex
0
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
MC4
D
MC5
D
D
MD7
MD11
D
1
2
D
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
3
MD8
D
MD6
D
4
MC2
D
MD15
D
5
MD5
MD9
D
MD12
M
6
D
D
7
M
D
M
8
MC3
D
D
D
M
9
M
MD13
D
A
B
C
D
E
F
D
MD10 MD14
D
MD4
D
D
MD2
D
D
MD3
D
M
D
MD0
MD1
D
M
D
D
M
M
M
D
6
Rev. E (03 2007)
ATMEL [ ATMEL ]
