W83977EG-AW Datasheet, PDF (36/142 Pages) Nuvotem Talema – These products are not designed for use in life support appliances

W83977EF-AW/W83977EG-AW
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:
765 4 3 ²¹ 0
11
MOT EN A
MOT EN B
WE
RDATA Toggle
WDATA Toggle
Drive SEL0
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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