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FDC37C669 Arkusz danych(PDF) 8 Page - SMSC Corporation |
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FDC37C669 Arkusz danych(HTML) 8 Page - SMSC Corporation |
8 / 164 page 8 DESCRIPTION OF PIN FUNCTIONS QFP/ TQFP PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 7 Direction Control nDIR OD48 This high current low active output determines the direction of the head movement. A logic "1" on this pin means outward motion, while a logic "0" means inward motion. 8 nStep Pulse nSTEP OD48 This active low high current driver issues a low pulse for each track-to-track movement of the head. 17 Disk Change nDSKCHG IS This input senses that the drive door is open or that the diskette has possibly been changed since the last drive selection. This input is inverted and read via bit 7 of I/O address 3F7H. 4,3 nDrive Select O,1 nDS0,1 OD48 Active low open drain outputs select drives 0-1. 2,5 nMotor On 0,1 nMTR0,1 OD48 These active low open drain outputs select motor drives 0-1. 1 DRVDEN0 DRVDEN0 OD48 Indicates the drive and media selected. Refer to configuration registers CR03, CR0B, CR1F. 14 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. 13 wTrack 00 nTRK00 IS This active low Schmitt Trigger input senses from the disk drive that the head is positioned over the outermost track. 12 nIndex 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. 18 DRVDEN1 DRVDEN 1 OD48 Indicates the drive and media selected. Refer to configuration registers CR03, CR0B, CR1F. SERIAL PORT INTERFACE 88 Receive Data 2 RXD2/IRRX I Receiver serial data input for port 2. IR Receive Data |
Podobny numer części - FDC37C669 |
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Podobny opis - FDC37C669 |
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