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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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LPC47M192 Fiches technique(PDF) 35 Page - SMSC Corporation |
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LPC47M192 Fiches technique(HTML) 35 Page - SMSC Corporation |
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35 / 228 page  SMSC DS – LPC47M192 Page 35 Rev. 03/30/05 DATASHEET Table 4 – Internal 2 Drive Decode – Drives 0 and 1 Swapped DIGITAL OUTPUT REGISTER DRIVE SELECT OUTPUTS (ACTIVE LOW) MOTOR ON OUTPUTS (ACTIVE LOW) Bit 5 Bit 4 Bit1 Bit 0 nDS1 nDS0 nMTR1 nMTR0 X 1 0 0 0 1 nBIT 4 nBIT 5 1 X 0 1 1 0 nBIT 4 nBIT 5 0 0 X X 1 1 nBIT 4 nBIT 5 BIT 6 MOTOR ENABLE 2 The MTR2 disk interface output is not supported in the LPC47M192. BIT 7 MOTOR ENABLE 3 The MTR3 disk interface output is not supported in the LPC47M192. TAPE DRIVE REGISTER (TDR) Address 3F3 READ/WRITE The Tape Drive Register (TDR) is included for 82077 software compatibility and allows the user to assign tape support to a particular drive during initialization. Any future references to that drive automatically invokes tape support. The TDR Tape Select bits TDR.[1:0] determine the tape drive number. Table 5 illustrates the Tape Select Bit encoding. Note that drive 0 is the boot device and cannot be assigned tape support. The remaining Tape Drive Register bits TDR.[7:2] are tristated when read. The TDR is unaffected by a software reset. Table 5 – Tape Select Bits TAPE SEL1 (TDR.1) TAPE SEL0 (TDR.0) DRIVE SELECTED 0 0 1 1 0 1 0 1 None 1 2 3 Normal Floppy Mode Normal mode.Register 3F3 contains only bits 0 and 1. When this register is read, bits 2 – 7 are ‘0’. DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 REG 3F3 0 0 0 0 0 0 tape sel1 tape sel0 Enhanced Floppy Mode 2 (OS2) Register 3F3 for Enhanced Floppy Mode 2 operation. DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 REG 3F3 Reserved Reserved Drive Type ID Floppy Boot Drive tape sel1 tape sel0 Table 6 – Drive Type ID DIGITAL OUTPUT REGISTER REGISTER 3F3 – DRIVE TYPE ID Bit 1 Bit 0 Bit 5 Bit 4 0 0 L0-CRF2 – B1 L0-CRF2 – B0 0 1 L0-CRF2 – B3 L0-CRF2 – B2 1 0 L0-CRF2 – B5 L0-CRF2 – B4 1 1 L0-CRF2 – B7 L0-CRF2 – B6 Note: L0-CRF2-Bx = Logical Device 0, Configuration Register F2, Bit x. |
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