idt49c465apqfb Integrated Device Technology, idt49c465apqfb Datasheet - Page 19

• Manufacturer Part Number: idt49c465apqfb
• Description: 32-bit Flow-thru Error Detection Correction Unit
• Manufacturer: Integrated Device Technology

IDT49C465/A
32-BIT FLOW-THRU ERROR DETECTION AND CORRECTION UNIT
DETAILED DESCRIPTION — 64-BIT CONFIGURATION (Con’t.)
64-BIT SYNDROME DECODE TO BIT-IN-ERROR
NOTES:
1. The table indicates the decoding of the seven syndrome bits to identify the bit-in-error for a single-bit error, or whether a double or triple-bit error was
KEY AC CALCULATIONS — 64-BIT CASCADED CONFIGURATION
NOTE:
1. (or) = Whichever is worse.
HEX S3
detected. The all-zero case indicates no error detected.
* = No errors detected
# = The number of the single bit-in-error
T = Two errors detected
M = Three or more detected
A
B
C
D
E
0
1
2
3
4
5
6
7
8
9
F
Generate
Detect
Correct
Mode
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Syndrome
S2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Bits
S1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
S0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
SD Bus
MD Bus
MD Bus
MD Bus
From
HEX
S7
S6
S5
S4
64-Bit Propagation Delay
C0
C1
C2
C3
17
16
M
M
T
T
T
T
T
T
T
0
0
0
0
0
*
C4
18
19
20
21
22
23
M
1
0
0
0
1
T
T
T
T
T
T
T
T
C5
10
11
12
13
M
2
0
0
1
0
T
T
8
T
9
T
T
T
T
T
Checkbits out
ERR
MERR
Corrected data out
(1)
14
15
for 64-bits
M
M
M
M
M
M
3
0
0
1
1
T
T
T
T
T
T
T
T
for 64-bits
C6
To
33
32
M
M
M
M
M
4
0
1
0
0
T
T
T
T
T
T
T
T
11.7
34
35
36
37
38
39
M
M
T
T
T
T
T
T
T
T
5
0
1
0
1
56
57
58
59
60
61
M
M
T
T
T
T
T
T
T
T
6
0
1
1
0
MILITARY AND COMMERCIAL TEMPERATURE RANGES
62
63
M
M
M
M
M
M
T
T
T
T
T
T
T
T
7
0
1
1
1
Total AC Delay for IDT49C465 in 64-bit Mode
C7
49
48
M
M
M
M
M
8
1
0
0
0
T
T
T
T
T
T
T
T
(or)
50
51
52
53
54
55
M
M
9
1
0
0
1
T
T
T
T
T
T
T
T
MD to SYO(U) + PCBI to SD(L)
MD to SYO(L) + CBI to
MD to SYO(L) + CBI to
MD to SYO(L) + CBI to SD(U)
SD to CBO(L) + PCBI to CBO(U)
40
41
42
43
44
45
M
M
A
1
0
1
0
T
T
T
T
T
T
T
T
t MSY(U) + t PCS(L)
t MSY(L) + t CE (U)
t MSY(L) + t CME (
t MSY(L) + t CS (U)
t SC(L) + t PCC(U)
(L) = Lower slice
(U) = Upper slice
46
47
M
M
M
M
M
M
B
1
0
1
1
T
T
T
T
T
T
T
T
M
M
M
M
M
M
C
1
1
0
0
T
T
T
T
T
T
1
T
0
T
M
M
D
1
1
0
1
T
T
2
T
3
4
T
T
5
6
T
7
T
T
ERR
M ERR
U
24
25
26
27
28
29
M
M
E
T
T
T
T
T
T
T
T
1
1
1
0
)
2552 tbl 17
2552 tbl 18
(U)
19
30
31
M
M
M
M
M
M
T
T
T
T
T
T
T
T
F
1
1
1
1