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FDC37C78-HT Datasheet(PDF) 8 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 8 Page - Microchip Technology |
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8 / 82 page  8 DESCRIPTION OF PIN FUNCTIONS PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 25, 26 Media ID0, Media ID1 MEDIA_ID0, MEDIA_ID1 I In Floppy Enhanced Mode 2 - These bits are the Media ID 0,1 inputs. The value of these bits can be read as bits 6 and 7 of the Floppy Tape Register. 28 Write Gate nWGATE OD20 This active low high current driver allows current to flow through the write head. It becomes active just prior to writing to the diskette. 15 Track 0 nTRK0 IS This active low Schmitt Trigger input senses from the disk drive that the head is positioned over the outermost track. 16 Index nINDEX IS This active low Schmitt Trigger input senses from the disk drive that the head is positioned over the beginning of a track, as marked by an index hole. 17 nWrite Protected nWRTPRT IS This active low Schmitt Trigger input senses from the disk drive that a disk is write protected. Any write command is ignored. 36 nMotor On 0 nMTR0 OD20 This active low open drain output selects motor drive 0. 37 nDrive Select 0 nDS0 OD20 This active low open drain output selects drive 0. 34 nMotor On 1 Idle nMTR1 IDLE OD20 OD20 This active low open drain output select motor drive 0. This pin indicates that the part is in the IDLE state and can be powered down. Whenever the part is in this state, IDLE pin is active high. If the part is powered down by the Auto Powerdown Mode, IDLE pin is set high and if the part is powered down by setting the DSR POWERDOWN bit (direct), IDLE pin is set low. 35 nDrive Select 1 Powerdown nDS1 PD OD20 OD20 This active low open drain output selects drive 0. This pin is active high whenever the part is in powerdown state, either via DSR POWERDOWN bit (direct) or via the Auto Powerdown Mode. This pin can be used to disable an external oscillator’s output. |
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Similar Description - FDC37C78-HT |
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