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LPC47N227 Datasheet(PDF) 6 Page - SMSC Corporation |
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LPC47N227 Datasheet(HTML) 6 Page - SMSC Corporation |
6 / 202 page 6 TQFP/STQFP PIN # NAME SYMBOL BUFFER TYPE PER FUNCTION 1 DESCRIPTION 5 Drive Select 0 nDS0 (O12/OD12) Active low output selects drive 0. 8 Direction Control nDIR (O12/OD12) 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. 9 Step Pulse nSTEP (O12/OD12) This active low high current driver issues a low pulse for each track-to-track movement of the head. 10 Write Data nWDATA (O12/OD12) This active low high current driver provides the encoded data to the disk drive. Each falling edge causes a flux transition on the media. 11 Write Gate nWGATE (O12/OD12) This active low high current driver allows current to flow through the write head. It becomes active just prior to writing to the diskette. 12 Head Select nHDSEL (O12/OD12) This high current output selects the floppy disk side for reading or writing. A logic “1” on this pin means side 0 will be accessed, while a logic “0” means side 1 will be accessed. 13 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. 14 Track 0 nTRK0 IS This active low Schmitt Trigger input senses from the disk drive that the head is positioned over the outermost track. 15 Write 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. The nWRPRT bit also depends upon the state of the Force Write Protect bit in the Force FDD Status Change configuration register (see subsection CR17 in the Configuration section). 16 Read Disk Data nRDATA IS Raw serial bit stream from the disk drive, low active. Each falling edge represents a flux transition of the encoded data. SERIAL PORTS INTERFACE 84 Receive Data 1 RXD1 IS Receiver serial data input for port 1. 85 Transmit Data 1 TXD1 O12 Transmit serial data output for port 1. |
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Similar Description - LPC47N227 |
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