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FDC37C78-HT Datasheet(PDF) 15 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 15 Page - Microchip Technology |
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15 / 82 page  15 Normal Floppy Mode Normal mode. Register 3F3 contains only bits 0 and 1. When this register is read, bits 2 - 7 are a high impedance. DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 REG 3F3 Tri-state Tri-state Tri-state Tri-state Tri-state Tri-state 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 Media ID1 Media ID0 Drive Type ID Floppy Boot Drive tape sel1 tape sel0 For this mode, DRATE0 and DRATE1 pins are inputs, and these inputs are gated into bits 6 and 7 of the 3F3 register. These two bits are not affected by a hard or soft reset. BIT 7 Media ID 1; Read Only (See Table 9a) BIT 6 Media ID 0; Read Only (See Table 9b) BITS 5 and 4 Drive Type ID - These Bits reflect two of the bits of configuration register 6; which two bits depends on the last drive selected in the Digital Output Register (3F2). (See Table 11) BITS 3 and 2 Floppy Boot Drive - These bits reflect the value of configuration register 7 bits 1, 0. Bit 3 = CR7 Bit DB1. Bit 2 = CR7 Bit DB0. Bits 1 and 0 - Tape Drive Select (READ/WRITE). Same as in Normal and Enhanced Floppy Mode. 1. Table 9a Media ID1 Pin 26 Bit 7 CR7-DB3=0 CR7-DB3=1 0 0 1 1 1 0 Table 9b Media ID0 Pin 25 Bit 6 CR7-DB2=0 CR7-DB2=1 0 0 1 1 1 0 Table 9c - Drive Type ID Digital Output Register Register 3F3 - Drive Type ID Bit 1 Bit 0 Bit 5 Bit 4 0 0 CR6 - Bit 1 CR6 - Bit 0 0 1 CR6 - Bit 3 CR6 - Bit 2 1 0 CR6 - Bit 5 CR6 - Bit 4 1 1 CR6 - Bit 7 CR6 - Bit 6 |
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