W83977F-A Datasheet, PDF (45/182 Pages) Winbond – WINBOND I/O

W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
In the PS/2 Model 30 mode, the bit definitions are as follows:
765 43
00 0
21
0
DRATE0
DRATE1
NOPREC
DMAEN
DSKCHG
DSKCHG (Bit 7):
This bit indicates the status of DSKCHG input.
Bit 6-4: These bits are always a logic 1 during a read.
DMAEN (Bit 3):
This bit indicates the value of DO REGISTER bit 3.
NOPREC (Bit 2):
This bit indicates the value of CC REGISTER NOPREC bit.
DRATE1 DRATE0 (Bit 1, 0):
These two bits select the data rate of the FDC.
Publication Release Date: May 2006
-37 -
Revision 0.60