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FDC37C78-HT Datasheet(PDF) 13 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 13 Page - Microchip Technology |
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13 / 82 page  13 TAPE DRIVE REGISTER (TDR) Address 3F3 READ/WRITE This register is included for 82077 software compatability. The robust digital data separator used in the FDC37C78 does not require its characteristics modified for tape support. The contents of this register are not used internal to the device. The TDR is unaffected by a software reset. Bits 2-7 are tri-stated when read in this mode. Table 4- Tape Select Bits Table 5 - Internal 4 Drive Decode - Normal DIGITAL OUTPUT REGISTER DRIVE SELECT OUTPUTS (ACTIVE LOW) MOTOR ON OUTPUTS (ACTIVE LOW) Bit 7 Bit 6 Bit 5 Bit 4 Bit1 Bit 0 nDS3 nDS2 nDS1 nDS0 nMTR3 nMTR2 nMTR1 nMTR0 X X X 1 0 0 1 1 1 0 nBIT 7 nBIT 6 nBIT 5 nBIT 4 X X 1 X 0 1 1 1 0 1 nBIT 7 nBIT 6 nBIT 5 nBIT 4 X 1 X X 1 0 1 0 1 1 nBIT 7 nBIT 6 nBIT 5 nBIT 4 1 X X X 1 1 0 1 1 1 nBIT 7 nBIT 6 nBIT 5 nBIT 4 0 0 0 0 X X 1 1 1 1 nBIT 7 nBIT 6 nBIT 5 nBIT 4 Table 6 - Internal 4 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 nDS3 nDS2 nDS1 nDS0 nMTR3 nMTR2 nMTR1 nMTR0 X X X 1 0 0 1 1 0 1 nBIT 7 nBIT 6 nBIT 4 nBIT 5 X X 1 X 0 1 1 1 1 0 nBIT 7 nBIT 6 nBIT 4 nBIT 5 X 1 X X 1 0 1 0 1 1 nBIT 7 nBIT 6 nBIT 4 nBIT 5 1 X X X 1 1 0 1 1 1 nBIT 7 nBIT 6 nBIT 4 nBIT 5 0 0 0 0 X X 1 1 1 1 nBIT 7 nBIT 6 nBIT 4 nBIT 5 TAPE SEL1 TAPE SEL2 DRIVE SELECTED 0 0 1 1 0 1 0 1 None 1 2 3 |
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