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IDT49C465 Datasheet(PDF) 16 Page - Integrated Device Technology

Part No. IDT49C465
Description  32-BIT FLOW-THRU ERROR DETECTION AND CORRECTION UNIT
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

IDT49C465 Datasheet(HTML) 16 Page - Integrated Device Technology

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11.7
16
IDT49C465/A
32-BIT FLOW-THRU ERROR DETECTION AND CORRECTION UNIT
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DETAILED DESCRIPTION — CHECKBIT AND
SYNDROME GENERATION vs. CODE ID
LOGIC EQUATIONS FOR THE CBO OUTPUTS
CODE ID 1,0
Checkbit
00
10
11
Generation
Final Chkbits
Partial Checkbits
Final Checkbits
CBO0
PH0
PH1
PH2
⊕ PCBI0
CBO1
PA
PA
PA
⊕ PCBI1
CBO2
PB
PB
PB
⊕ PCBI2
CBO3
PC
PC
PC
⊕ PCBI3
CBO4
PD
PD
PD
⊕ PCBI4
CBO5
PE
PE
PE
⊕ PCBI5
CBO6
PF
PF
PF
⊕ PCBI6
CBO7
PF
PG
⊕ PCBI7
2552 tbl 07
LOGIC EQUATIONS FOR THE SYO OUTPUTS
Checkbit/
CODE ID 1,0
Syndrome
00
10
11
Generation
Final Syndrome Partial Syndrome Partial Checkbits
SYO0
PH0
⊕ CBI0
PH1
⊕ CBI0
PH2
SYO1
PA
⊕ CBI1
PA
⊕ CBI1
PA
SYO2
PB ⊕ CBI2
PB ⊕ CBI2
PB
SYO3
PC ⊕ CBI3
PC ⊕ CBI3
PC
SYO4
PD
⊕ CBI4
PD
⊕ CBI4
PD
SYO5
PE
⊕ CBI5
PE
⊕ CBI5
PE
SYO6
PF
⊕ CBI6
PF
⊕ CBI6
PF
SYO7
PF
⊕ CBI7
PG
2552 tbl 08
32-BIT SYNDROME DECODE TO BIT-IN-ERROR
(1)
HEX
01
23
45
6
7
S6
00
00
11
1
1
Syndrome
S5
00
11
00
1
1
Bits
S4
01
01
01
0
1
HEX
S3 S2 S1 S0
0
0
0
0
0
*
C4 C5
T
C6
T
T
30
10
0
0
1
C0
T
T
14
T
M
M
T
2
0
0
1
0
C1
T
T
M
T
2
24
T
30
0
1
1
T
18
8
T
M
T
T
M
4
0
1
0
0
C2
T
T
15T
3
25T
5
0
1
0
1
T
19
9
T
M
T
T
31
6
0
1
1
0
T
20 10
T
M
T
T
M
70
1
1
1
M
T
T
M
T
4
26
T
8
1
0
0
0
C3
T
T
M
T
5
27
T
9
1
0
0
1
T
21 11
T
M
T
T
M
A
1
0
1
0
T
22 12
T
1
T
T
M
B
1
0
1
1
17
T
T
M
T
6
28
T
C
1
1
0
0
T
23 13
T
M
T
T
M
D1
1
0
1
M
T
T
M
T
7
29
T
E
1
1
1
0
16
T
TM
TM
M
T
F
1
1
1
1
T
M
M
T
0TT
M
NOTES:
2552 tbl 12
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
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
LOGIC EQUATIONS FOR THE FINAL SYNDROME (FSn)
Final
CODE ID 1,0
Syndrome
00
10, 11
Generation
Final Syndrome
Final Internal Syndrome
FS0
PH0
⊕ CBI0
PH1 (L)
⊕ PH2 (U) ⊕ CBI0
FS1
PA
⊕ CBI1
PA (L)
⊕ PA (U) ⊕ CBI1
FS2
PB ⊕ CBI2
PB (L)
⊕ PB (U) ⊕ CBI2
FS3
PC ⊕ CBI3
PC (L)
⊕ PC (U) ⊕ CBI3
FS4
PD
⊕ CBI4
PD (L)
⊕ PD (U) ⊕ CBI4
FS5
PE
⊕ CBI5
PE (L)
⊕ PE (U) ⊕ CBI5
FS6
PF
⊕ CBI6
PF (L)
⊕ PF (U) ⊕ CBI6
FS7
PF (L)
⊕ PG (U)⊕ CBI7
2552 tbl 09


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