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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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74F632VC датащи(PDF) 5 Page - National Semiconductor (TI) |
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74F632VC датащи(HTML) 5 Page - National Semiconductor (TI) |
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5 / 14 page  Functional Description (Continued) TABLE IV Read Flag and Correct Function Memory EDAC Control DB Control DB Output CB Error Flags Cycle Function S1 S0 Data IO OEBn Latch Check IO Control ERR MERR LEDBO OECB Read Read Flag H L Input H X Input H Enabled (Note 1) Read Latch Input Latched Latched Data Check H H Input H L Input H Enabled (Note 1) Bits Data Check Word Read Output Output Output Corrected Data H H Corrected L X Syndrome L Enabled (Note 1) Syndrome Bits Data Word Bits (Note 2) Note 1 See Table III for error description Note 2 See Table V for error location TABLE V Syndrome Decoding Syndrome Bits Error 654 3 210 LLL L LLL unc L L L L L L H 2-Bit L L L L L H L 2-Bit LLL L L H H unc L L L L H L L 2-Bit LLL L H L H unc LLL L H H L unc L L L L H H H 2-Bit (Note 2) L L L H L L L 2-Bit LLL H L L H unc LLL H L H L DB31 L L L H L H H 2-Bit LLL H H LL unc L L L H H L H 2-Bit L L L H H H L 2-Bit LLL H H H H DB30 L L H L L L L 2-Bit LL H L LL H unc L L H L LHL DB29 L L H L L H H 2-Bit LL H L H L L DB28 L L H L H L H 2-Bit L L H L H H L 2-Bit L L H L HHH DB27 LL H H LLL DB26 L L H H L L H 2-Bit L L H H L H L 2-Bit LL H H L H H DB25 L L H H H L L 2-Bit L L H H HLH DB24 L L H H H H L unc L L H H H H H 2-Bit Syndrome Bits Error 654 3 2 10 L H L L L L L 2-Bit LHL L L LH unc LHL L L HL DB7 L H L L L H H 2-Bit LHL L HL L DB6 L H L L H L H 2-Bit L H L L H H L 2-Bit LHL L H H H DB5 L H LHL L L DB4 L H L H L L H 2-Bit L H L H L H L 2-Bit L H LHL H H DB3 L H L H H L L 2-Bit LHL H HLH DB2 L H L H H H L unc L H L H H H H 2-Bit LH H L L L L DB0 L H H L L L H 2-Bit L H H L L H L 2-Bit L H H L L H H unc L H H L H L L 2-Bit LH H L H LH DB1 LH H L H HL unc L H H L H H H 2-Bit L H H H L L L 2-Bit L H H H L L H unc L H H H L H L unc L H H H L H H 2-Bit L H HHH L L unc L H H H H L H 2-bit L H H H H H L 2-bit L H HHH H H CB6 CBX e Error in check bit X DBY e Error in data bit Y 2-Bit e Double-bit error unc e Uncorrectable multi-bit error Note 2-bit and unc condition will cause both ERR and MERR to be LOW Note 1 Syndrome bits for all LOWs MERR and ERR LOW for all LOWs only ERR LOW for DB30 error Note 2 Syndrome bits for all HIGHs 5 |
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