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IDT49C465 Datasheet(PDF) 16 Page - Integrated Device Technology |
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IDT49C465 Datasheet(HTML) 16 Page - Integrated Device Technology |
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16 / 38 page  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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