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74F632VC Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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74F632VC Datasheet(HTML) 7 Page - National Semiconductor (TI) |
7 / 14 page Functional Description (Continued) TABLE VI Read-Modify-Write Function Memory EDAC Control DB Output CB Error Flags Cycle Function S1 S0 BYTEn OEBn Latch Check IO Control ERR MERR LEDBO OECB Read Read Flag H L Input H X Input H Enabled Read Latch Input Latched Latched Data H H Input H L Input H Enabled Check Bits Data Check Word Read Latch Corrected Latched High Z H Data Word into HH Output HH Output L Enabled Output Latch Data Syndrome Word Bits Modify Modify Input Write Appropriate Modified H Byte or Bytes LL BYTE0 H Output LH H Generate New Output Check Word Check Word Unchanged L BYTE0 OEB0 controls DB0–DB7 (BYTE0) OEB1 controls DB8–DB15 (BYTE1) OEB2 controls DB16–DB23 (BYTE2) OEB3 controls DB24–DB31 (BYTE3) TABLE VII Diagnostic Function EDAC Control DB Byte DB Output CB Error Flags Function S1 S0 Data IO Control Latch Check IO Control ERR MERR OEBn LEDBO OECB Read Flag HL Input Correct HX Input Correct HH Data Word Check Bits Latch Input Check Word while Data Input Latched Input Latch L H Diagnostic H L Input H Enabled Remains Data Word Check Bits Transparent Latch Diagnostic Input Output Data Word into L H Diagnostic H H Latched L Output Latch Data Word Check Bits Enabled High Z H Latch Diagnostic Latched Output Data Word into HH Input HH Syndrome L Enabled Input Latch Diagnostic Bits Data Word High Z H Output Diagnostic Output Output Data Word H H Diagnostic L H Syndrome L Enabled Syndrome Bits Data Word Bits High Z H Output Corrected Output Output Diagnostic Data HH Corrected LL Syndrome L Enabled Word Output Diagnostic Bits Syndrome Bits Data Word High Z H Diagnostic data is a data word with an error in one bit location except when testing the MERR error flag In this casethe diagnostic data word will contain errors in two bit locations 7 |
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