IDT49C465GB Ver la hoja de datos (PDF) - Integrated Device Technology
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IDT49C465GB Datasheet PDF : 38 Pages
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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
Checkbit
00
Generation Final Chkbits
CBO0
PH0
CBO1
PA
CBO2
PB
CBO3
PC
CBO4
PD
CBO5
PE
CBO6
PF
CBO7
—
CODE ID 1,0
10
Partial Checkbits
PH1
PA
PB
PC
PD
PE
PF
PF
11
Final Checkbits
PH2 ⊕ PCBI0
PA ⊕ PCBI1
PB ⊕ PCBI2
PC ⊕ PCBI3
PD ⊕ PCBI4
PE ⊕ PCBI5
PF ⊕ PCBI6
PG ⊕ PCBI7
2552 tbl 07
LOGIC EQUATIONS FOR THE SYO OUTPUTS
Checkbit/
Syndrome
Generation
SYO0
SYO1
SYO2
SYO3
SYO4
SYO5
SYO6
SYO7
CODE ID 1,0
00
10
11
Final Syndrome Partial Syndrome Partial Checkbits
PH0 ⊕ CBI0
PH1 ⊕ CBI0
PH2
PA ⊕ CBI1
PA ⊕ CBI1
PA
PB ⊕ CBI2
PB ⊕ CBI2
PB
PC ⊕ CBI3
PC ⊕ CBI3
PC
PD ⊕ CBI4
PD ⊕ CBI4
PD
PE ⊕ CBI5
PE ⊕ CBI5
PE
PF ⊕ CBI6
PF ⊕ CBI6
PF
—
PF ⊕ CBI7
PG
2552 tbl 08
LOGIC EQUATIONS FOR THE FINAL SYNDROME (FSn)
Final
Syndrome
Generation
FS0
FS1
FS2
FS3
FS4
FS5
FS6
FS7
CODE ID 1,0
00
10, 11
Final Syndrome Final Internal Syndrome
PH0 ⊕ CBI0
PH1 (L) ⊕ PH2 (U) ⊕ CBI0
PA ⊕ CBI1
PB ⊕ CBI2
PC ⊕ CBI3
PA (L) ⊕ PA (U) ⊕ CBI1
PB (L) ⊕ PB (U) ⊕ CBI2
PC (L) ⊕ PC (U) ⊕ CBI3
PD ⊕ CBI4
PD (L)⊕ PD (U) ⊕ CBI4
PE ⊕ CBI5
PE (L) ⊕ PE (U) ⊕ CBI5
PF ⊕ CBI6
PF (L) ⊕ PF (U) ⊕ CBI6
—
PF (L) ⊕ PG (U)⊕ CBI7
2552 tbl 09
32-BIT SYNDROME DECODE TO BIT-IN-ERROR (1)
HEX 0 1 2 3 4 5 6 7
S6 0 0 0 0 1 1 1 1
Syndrome S5 0 0 1 1 0 0 1 1
Bits
S4 0 1 0 1 0 1 0 1
HEX S3 S2 S1 S0
0 0000
* C4 C5 T C6 T T 30
1 0001
C0 T T 14 T M M T
2 0010
C1 T T M T 2 24 T
3 0011
T 18 8 T M T T M
4 0100
C2 T T 15 T 3 25 T
5 0101
T 19 9 T M T T 31
6 0110
T 20 10 T M T T M
7 0111
M T T M T 4 26 T
8 1000
C3 T T M T 5 27 T
9 1001
T 21 11 T M T T M
A 1010
T 22 12 T 1 T T M
B 1011
17 T T M T 6 28 T
C 1100
T 23 13 T M T T M
D 1101
M T T M T 7 29 T
E 1110
16 T T M T M M T
F 1111
TMMT 0 T TM
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
11.7
16
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