HD63265 Floppy Disk Controller Users Manual 2ed Mar89 - Bitsavers

Table 6-15.STR Changes for Each CommandCommandIssueTimingSTR ChangeAll commandsexcept CHECKINTERRUPTSTATUS, SLEEP,and ABORTNormalWrite commandcodeHEX 8X ____ J___ HEX IXWait forcommandFDC busyWriteparameterHEX 9X ____ J___ HEX IXRequestcommand parameterDuringperiod ADuringperiod BWrite commandcode+HEX 8X -------- HEX IX -------- HEX 8XIgnore command codeWrite commandRequestcode parameterHEX 8X -------- +HEX IX -------- HEX OX -------- HEX 8XReset BSYCHECKINTERRUPTSTATUSNormalHEX 8XWrite commandcode+HEX IXAcceptparametertHEX DX --------Request parameteracceptanceHEX IXSLEEPDuringperiod ADuringperiod BNormalDuringperiod ADuringperiod BWrite commandcodeHEX 8X -------- +HEX IX -------- HEX 8XIgnore command codeWrite commandcodeHEX 8X -------- +HEX IX -------- HEX OX -------- HEX CXcode+Reset BSY Requestparameteracceptancewrite commandHEX 80 -------- HEX 10 -------- HEX 80SLEEPWrite commandcode+HEX 80 -------- HEX 10 -------- HEX 80(Ignore command code)Do not enter sleep modeWrite commandcode+HEX 80 -------- HEX 10 -------- HEX 00 -------- HEX 80Reset BSY Enter SLEEPmodeNotes: 1.ABORT is always accepted.2. X indicates HEX a - HEX F.78 HITACHI