W83627DHG Datasheet, PDF (138/268 Pages) Winbond – WINBOND LPC I/O

W83627DHG
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
10.2.2 Status Register B (SB Register) (Read base address + 1)
Along with the SA register, the SB 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:
76 5 43 ²¹ 0
11
MOT EN A
Reserved
WE
RDATA Toggle
WDATA Toggle
Drive SEL0
Drive SEL0 (Bit 5):
This bit indicates the status of the DO REGISTER, bit 0 (drive-select bit 0).
WDATA Toggle (Bit 4):
This bit changes state on every rising edge of the WD# output pin.
RDATA Toggle (Bit 3):
This bit changes state on every rising edge of the RDATA# output pin.
WE (Bit 2):
This bit indicates the complement of the WE# output pin.
RESERVED (Bit 1)
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:
-126-
Publication Release Date: Aug, 22, 2007
Version 1.4