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IDT49C465GB Datasheet(PDF) 6 Page - Integrated Device Technology |
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IDT49C465GB Datasheet(HTML) 6 Page - Integrated Device Technology |
6 / 38 page 11.7 6 IDT49C465/A 32-BIT FLOW-THRU ERROR DETECTION AND CORRECTION UNIT MILITARY AND COMMERCIAL TEMPERATURE RANGES FUNCTIONAL DESCRIPTION The error detection/correction codes consist of a modified Hamming code; it is identical to that used in the IDT49C460. 32-BIT MODE (CODE ID 1,0=00) Figure 5. 32-Bit Mode VCC CHECKBITS–IN CHECKBITS–OUT SYNDROME–OUT CBO SYO PCBI CBI0–6 CBI7 EDC 7 7 7 8 2552 drw 09 64-BIT MODE (CODE ID 1,0=10 & 11) The expansion bus topology is shown in Figure 6. This topology allows the syndrome bits used by the correction logic to be generated simultaneously in both parts used in the expansion. During a 64-bit detection or correction operation, “Partial-Checkbit” data and “Partial-Syndrome” data is simul- taneously exchanged between the two EDC units in opposite directions on dedicated expansion buses. This results in very short 64-bit detection and correction times. 8 8 8 8 8 FINAL CHECKBITS–OUT (DETECT AND CORRECT) CBO SYO ERR PCBI CBI UPPER EDC PARTIAL–CHECKBITS–OUT (10) (GENERATE ONLY) PARTIAL–SYNDROME (DETECT/CORRECT ONLY) PARTIAL–CHECKBITS–OUT (10) (GENERATE ONLY) PARTIAL–CHECKBITS–OUT (11) (CORRECTION ONLY) CBO SYO PCBI CBI CHECKBITS–IN LOWER EDC (CODE ID 1,0 = 10) (CODE ID 1,0 = 11) 2552 drw 10 Figure 6. 64-Bit Mode — 2 Cascaded IDT49C465 Devices 64-BIT GENERATE-ONLY MODE (CODE ID 1,0=01) If the Identity pins CODE ID 1,0 = 01, a single EDC is placed in the 64-bit “Generate-only” mode. In this mode, the lower 32 bits of the 64-bit data word enter the device on the MD0-31 inputs and the upper 32-bits of the 64 bit data word enter the Figure 7. 64-Bit "Generate-Only" Mode (Single Chip) device on the SD0-31 inputs. This provides the device with the full 64-bit word from memory. The resultant generated checkbits are output on the CBO0-7 outputs. The generate time is less than that resulting from using a 2-chip cascade. CBO MD0–31 SD0–31 EDC CHECKBITS–OUT LOWER 32 BITS (0–31) UPPER 32 BITS (32–63) 32 32 8 2552 drw 11 |
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