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LPC47M14X 数据表(PDF) 31 Page - SMSC Corporation |
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LPC47M14X 数据表(HTML) 31 Page - SMSC Corporation |
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31 / 205 page  SMSC DS – LPC47M14X Page 31 Rev. 03/19/2001 Table 6 – Internal 2 Drive Decode - Drives 0 and 1 Swapped DIGITAL OUTPUT REGISTER DRIVE SELECT OUTPUTS (ACTIVE LOW) MOTOR ON OUTPUTS (ACTIVE LOW) Bit 7 Bit 6 Bit 5 Bit 4 Bit1 Bit 0 nDS1 nDS0 nMTR1 nMTR0 X X X 1 0 0 0 1 nBIT 4 nBIT 5 X X 1 X 0 1 1 0 nBIT 4 nBIT 5 X 1 X X 1 0 1 1 nBIT 4 nBIT 5 1 X X X 1 1 1 1 nBIT 4 nBIT 5 0 0 0 0 X X 1 1 nBIT 4 nBIT 5 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 7 – 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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