idt49c465apqfb Integrated Device Technology, idt49c465apqfb Datasheet - Page 16

• 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 — CHECKBIT AND
SYNDROME GENERATION vs. CODE ID
LOGIC EQUATIONS FOR THE CBO OUTPUTS
LOGIC EQUATIONS FOR THE SYO OUTPUTS
LOGIC EQUATIONS FOR THE FINAL SYNDROME (FSn)
Generation Final Chkbits
Generation
Syndrome
Checkbit/
Checkbit
SYO0
SYO1
SYO2
SYO3
SYO7
SYO4
SYO5
SYO6
CBO
CBO
CBO
CBO
CBO
CBO
CBO
CBO
Generation
Syndrome
FS
FS
FS
FS
FS
FS
FS
FS
Final
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Final Syndrome Partial Syndrome Partial Checkbits
PH0
PA
PB
PC
PD
PE
PF
—
PH
PA
PB
PC
PD
PE
PF
—
00
0
Final Syndrome
00
CBI1
CBI2
CBI6
CBI3
CBI4
CBI5
CBI0
PH
PA
PB
PC
PD
PE
PF
—
0
00
CBI
CBI
CBI
CBI
CBI
CBI
CBI
Partial Checkbits
6
1
2
3
5
4
CODE ID 1,0
CODE ID 1,0
0
PH1
PA
PB
PC
PD
PE
PF
PF
PH
PA
PB
PC
PD
PE
PF
PF
CODE ID 1,0
10
10
CBI1
CBI2
CBI3
CBI5
CBI6
CBI7
CBI4
1
PH
PA (L)
PB (L)
PC (L)
PD (L) PD (U)
PE (L)
PF (L)
PF (L)
CBI0
Final Internal Syndrome
1
(L)
PA (U)
PB (U)
PC (U)
PE (U)
PF (U)
PG (U) CBI
PH
10, 11
Final Checkbits
2
PH
PA
PB
PC
PD
PE
PF
PG
(U)
PH2
PA
PB
PC
PD
PE
PF
PG
2
11
CBI
CBI
CBI
CBI
CBI
CBI
11
PCBI
PCBI
PCBI
PCBI
PCBI
PCBI
CBI
PCBI
PCBI
7
6
4
2
5
1
3
2552 tbl 07
2552 tbl 08
2552 tbl 09
0
6
1
2
5
3
4
7
0
11.7
32-BIT SYNDROME DECODE TO BIT-IN-ERROR
NOTES:
1. The table indicates the decoding of the seven syndrome bits to identify the
HEX S3 S2 S1 S0
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
bit-in-error for a single-bit error, or whether a double or triple-bit error was
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 errors detected
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Syndrome
MILITARY AND COMMERCIAL TEMPERATURE RANGES
Bits
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
HEX
S6
S5
S4
C0
C1
C2
C3
17
16
M
M
0
0
0
0
T
T
T
T
T
T
T
*
C4 C5
18
19
20 10
21 11
22 12
23 13
M
1
0
0
1
T
T
T
T
T
T
T
T
M
T
T
T
T
T
T
T
T
2
0
1
0
8
9
14
15
M
M
M
M
M
M
T
T
T
T
T
T
T
T
3
0
1
1
C6 T
M
M
M
M
M
4
1
0
0
T
T
T
T
T
1
T
T
T
0
M
M
5
1
0
1
2
T
3
T
T
4
5
T
T
6
T
7
T
(1)
24
25
26
27
28
29
M
M
6
1
1
0
T
T
T
T
T
T
T
T
2552 tbl 12
16
30
31
M
M
M
M
M
M
T
T
T
T
T
T
T
T
7
1
1
1