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DP8404D Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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DP8404D Datasheet(HTML) 3 Page - National Semiconductor (TI) |
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3 / 18 page  Mode Definitions DESCRIPTION PIN NAME MODE S1 S0 MODE OPERATION 0 L L WRITE Input dataword and output checkword 1 L H DIAGNOSTICS Input various data words against latched checkwordoutput valid error flags 2 H L READ FLAG Input dataword and output error flags 3 H H CORRECT Latched input data and checkwordoutput corrected data and syndrome code Pin Definitions S0 S1 Control of EDAC mode see preceding Mode Definitions DB0 thru DB31 IO port for 32 bit dataword CB0 thru CB6 IO port for 7 bit checkword Also output port for the syndrome error code during error correction mode OEB0 thru Dataword output buffer enable When high OEB3 output buffers are at TRI-STATE Each pin (DP8402A controls 8 IO ports OEB0 controls DB0 DP8403) thru DB7 OEB1 controls DB8 thru DB15 OEB2 controls DB16 thru DB23 and OEB3 controls DB24 thru DB31 LEDBO Data word output Latch enable When high (DP8402A it inhibits input to the Latch Operates on all DP8403) 32 bits of the dataword OEDB TRI-STATE control for the data IO port (DP8404 When high output buffers are at DP8405) TRI-STATE OECB Checkword output buffer enable When high the output buffers are in TRI-STATE mode ERR Single error output flag a low indicates at least a single bit error MERR Multiple error output flag a low indicates two or more errors present PCC Pin Definitions DP8402A pin 1 VCC pin 35 OECB 2 LEDBO 36 CB3 3 MERR 37 CB2 4 ERR 38 CB1 5 DB0 39 CB0 6 DB1 40 DB16 7 DB2 41 DB17 8NC 42 NC 9NC 43 NC 10 NC 44 DB18 11 DB3 45 DB19 12 DB4 46 DB20 13 DB5 47 DB21 14 OEBO 48 OEB2 15 DB6 49 DB22 16 DB7 50 DB23 17 GND 51 GND 18 GND 52 GND 19 DB8 53 DB24 20 DB9 54 DB25 21 OEB1 55 OEB3 22 DB10 56 DB26 23 DB11 57 DB27 24 DB12 58 DB28 25 DB13 59 NC 26 DB14 60 NC 27 NC 61 NC 28 NC 62 NC 29 NC 63 DB29 30 DB15 64 DB30 31 NC 65 DB31 32 CB6 66 S0 33 CB5 67 S1 34 CB4 68 VCC TABLE I Write Control Function Memory EDAC Control DB Control DB Output Latch CB Error Flags Cycle Function S1 S0 Data IO OEBn or DP8402A DP8403 Check IO Control ERR MERR OEDB LEDBO OECB Write Generate L L Input H X Output LH H check word check bits See Table II for details on check bit generation Memory Write Cycle Details During a memory write cycle the check bits (CB0 thru CB6) are generated internally in the EDAC by seven 16-input pari- ty generators using the 32-bit data word as defined in Table 2 These seven check bits are stored in memory along with the original 32-bit data word This 32-bit word will later be used in the memory read cycle for error detection and cor- rection 3 |
Similar Part No. - DP8404D |
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Similar Description - DP8404D |
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