When Tsunami detects a correctable ECC error, the ECC syndrome for the quadword in error is latched on error into the SYN field in P0_ERROR or P1_ERROR depending on where the error is occurred. When the CPU detects a correctable ECC error, the ECC syndrome for the first quadword is latched into the C_SYNDROME0 field of the C_BOX; the ECC syndrome for the low quadword is saved in the C_SYNDROME1 field of the C_BOX.
See the tables below for decoding single bit errors in the data and check bits. A syndrome of zero implies no error in that quadword. If the syndrome is not in either of these tables, then the error involved more than one bit.|
Syndrome |
Bit |
Syndrome |
Bit |
Syndrome |
Bit |
Syndrome |
Bit |
|
CE |
00 |
0E |
16 |
4F |
32 |
8F |
48 |
|
CB |
01 |
0B |
17 |
4A |
33 |
8A |
49 |
|
D3 |
02 |
13 |
18 |
52 |
34 |
92 |
50 |
|
D5 |
03 |
15 |
19 |
54 |
35 |
94 |
51 |
|
D6 |
04 |
16 |
20 |
57 |
36 |
97 |
52 |
|
D9 |
05 |
19 |
21 |
58 |
37 |
98 |
53 |
|
DA |
06 |
1A |
22 |
5B |
38 |
9B |
54 |
|
DC |
07 |
1C |
23 |
5D |
39 |
9D |
55 |
|
23 |
08 |
E3 |
24 |
A2 |
40 |
62 |
56 |
|
25 |
09 |
E5 |
25 |
A4 |
41 |
64 |
57 |
|
26 |
10 |
E6 |
26 |
A7 |
42 |
67 |
58 |
|
29 |
11 |
E9 |
27 |
A8 |
43 |
68 |
59 |
|
2A |
12 |
EA |
28 |
AB |
44 |
6B |
60 |
|
2C |
13 |
EC |
29 |
AD |
45 |
6D |
61 |
|
31 |
14 |
F1 |
30 |
B0 |
46 |
70 |
62 |
|
34 |
15 |
F4 |
31 |
B5 |
47 |
75 |
63 |
|
Syndrome |
Bit |
Syndrome |
Bit |
Syndrome |
Bit |
Syndrome |
Bit |
|
|
01 |
0 |
04 |
2 |
10 |
4 |
40 |
6 |
|
|
02 |
1 |
08 |
3 |
20 |
5 |
80 |
7 |
|