w83877atd Winbond Electronics Corp America, w83877atd Datasheet - Page 34
w83877atd
Manufacturer Part Number
w83877atd
Description
Winbond I/o
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83877ATD.pdf
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WP (Bit 1):
0
1
This bit indicates the direction of head movement.
0
1
2.2.2 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:
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:
DIR (Bit 0)
disk is not write-protected
disk is write-protected
inward direction
outward direction
7
1
6
1
5
4
3
2
- 30 -
1
0
MOT EN A
MOT EN B
WDATA Toggle
WE
RDATA Toggle
Drive SEL0
Publication Release Date: April 1998
W83877ATF
Version 0.51
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