W83877TF Datasheet, PDF (41/154 Pages) Winbond – I/O chip disk drive adapter

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W83877TF
DSC
DSD
WE F/F
RDATA F/F
WD F/F
DSA
DSB
DRV2
DRV2 (Bit 7):
0 A second drive has been installed
1 A second drive has not been installed
DSB (Bit 6):
This bit indicates the status of DSB output pin.
DSA (Bit 5):
This bit indicates the status of DSA output pin.
WD F/F(Bit 4):
This bit indicates the complement of the latched WD output pin at every rising edge of the WD
output pin.
RDATA F/F(Bit 3):
This bit indicates the complement of the latched RDATA output pin .
WE F/F (Bit 2):
This bit indicates the complement of latched WE output pin.
DSD (Bit 1):
0 Drive D has been selected
1 Drive D has not been selected
DSC (Bit 0):
0 Drive C has been selected
1 Drive C has not been selected
2.2.3 Digital Output Register (DO Register) (Write base address + 2)
The Digital Output Register is a write-only register controlling drive motors, drive selection, DRQ/IRQ
enable, and FDC resetting. All the bits in this register are cleared by the MR pin. The bit definitions
are as follows:
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Publication Release Date: March 1998
Version 0.61