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PC8477BVF-1 Datasheet(PDF) 46 Page - National Semiconductor (TI) |
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PC8477BVF-1 Datasheet(HTML) 46 Page - National Semiconductor (TI) |
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46 / 54 page  70 Reference Section 71 MNEMONIC DEFINITIONS FOR PC8477B COMMANDS Symbol Description BFR Buffer enable bit used in the Mode command Enabled open-collector output buffers BST Burst Mode disable control bit used in Mode command Selects the Non-Burst FIFO mode if the FIFO is enabled DC0 Drive Configuration 0 – 3 Used to set a drive to conventional or perpendicular mode Used in DC1 Perpendicular Mode command DC2 DC3 DENSEL Density Select control bits used in the Mode command DIR Direction control bit used in Relative Seek command to indicate step in or out DMA DMA mode enable bit used in the Specify command DR0 Drive Select 0 – 1 bits used in most commands Selects the logical drive DTL Data Length parameter used in the Read Write Scan and Verify commands EC Enable Count control bit used in the Verify command When this bit is 1 the DTL parameter becomes SC (Sector Count) EIS Enable Implied Seeks Used in the Configure command EOT End of Track parameter set in the Read Write Scan and Verify commands ETR Extended Track Range used with the Seek command FIFO First-In First-Out buffer Also a control bit used in the Configure command to enable or disable the FIFO FRD FIFO Read disable control bit used in the Mode command FWR FIFO Write disable control bit used in the Mode command GAP Gap2 control bit used in the Perpendicular Mode command HD Head Select control bit used in most commands Selects Head 0 or 1 of the disk IAF Index Address Field control bit used in the Mode command Enables the ISO Format during the Format command IPS Implied Seek enable bit used in the Mode Read Write and Scan commands LOCK Lock enable bit in the Lock command Used to make certain parameters unaffected by a software reset LOW Low Power control bits used in the Mode command PWR Symbol Description MFM Modified Frequency Modulation control bit used in the Read Write Format Scan and Verify commands Selects MFM or FM data encoding MFT Motor Off Time programmed in the Specify command MNT Motor On Time programmed in the Specify command MT Multi-Track enable bit used in the Read Write Scan and Verify commands OW Overwrite control bit used in the Perpendicular Mode command POLL Enable Drive Polling bit used in the Configure command PRETRK Precompensation Track Number used in the Configure command PTR Present Track Register Contains the internal track number for one of the four logical disk drives PU Pump diagnostic enable bit used in the Mode command R255 Recalibrate control bit used in Mode command Sets maximum recalibrate step pulses to 255 RG Read Gate diagnostic enable bit used in the Mode command RTN Relative Track Number used in the Relative Seek command SC Sector Count control bit used in the Verify command SK Skip control bit used in read and scan operations SRT Step Rate Time programmed in the Specify command Determines the time between step pulses for seek and recalibrates ST0 Status Register 0 – 3 Contains status information about the execution of a command ST1 Read in the Result Phase of some commands ST2 ST3 THRESH FIFO threshold parameter used in the Configure command TMR Timer control bit used in the Mode command Affects the timers set in the Specify command WG Write Gate control bit used in the Perpendicular Mode command WLD Wildcard bit in the Mode command used to enable or disable the wildcard byte (FF) during Scan commands 46 |
Similar Part No. - PC8477BVF-1 |
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Similar Description - PC8477BVF-1 |
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