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W83977EF-AW Datasheet(PDF) 36 Page - Winbond |
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W83977EF-AW Datasheet(HTML) 36 Page - Winbond |
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36 / 142 page  W83977EF-AW/W83977EG-AW -34- INDEX (Bit 2): This bit indicates the complement of INDEX# output. WP (Bit 1): 0 disk is not write-protected 1 disk is write-protected DIR#(Bit 0) This bit indicates the direction of head movement. 0 inward direction 1 outward direction 5.2.2 Status Register B (SB Register) (Read base address + 1) This register is used to monitor several disk interface pins in PS/2 and Model 30 modes. In PS/2 mode, the bit definitions for this register are as follows: 1 2 3 4 5 6 7 0 MOT EN A WE RDATA Toggle WDATA Toggle Drive SEL0 MOT EN B 1 1 Drive SEL0 (Bit 5): This bit indicates the status of DO REGISTER bit 0 (drive select bit 0). WDATA Toggle (Bit 4): This bit changes state at every rising edge of the WD# output pin. RDATA Toggle (Bit 3): This bit changes state at every rising edge of the RDATA# output pin. WE (Bit 2): This bit indicates the complement of the WE# output pin. MOT EN B (Bit 1) This bit indicates the complement of the MOB# output pin. MOT EN A (Bit 0) This bit indicates the complement of the MOA# output pin. In PS/2 Model 30 mode, the bit definitions for this register are as follows: |
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