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W83977EF-AW Datasheet(PDF) 43 Page - Winbond

Part # W83977EF-AW
Description  WINBOND ISA I/O
Download  142 Pages
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
Logo WINBOND - Winbond

W83977EF-AW Datasheet(HTML) 43 Page - Winbond

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W83977EF-AW/W83977EG-AW
Publication Release Date: Apr. 2006
-41-
Revision 1.2
5.2.8
Digital Input Register (DI Register) (Read base address + 7)
The Digital Input Register is an 8-bit read-only register used for diagnostic purposes. In a PC/XT or AT
only Bit 7 is checked by the BIOS. When the register is read, Bit 7 shows the complement
ofDSKCHG#
, while other bits of the data bus remain in tri-state. Bit definitions are as follows:
x
x
x
x
x
x
x
x
0
1
2
3
4
5
6
7
Reserved for the hard disk controller
During a read of this register, these bits are in tri-stat
DSKCHG
In the PS/2 mode, the bit definitions are as follows:
1
2
3
4
5
6
7
0
HIGH DENS#
DRATE0
DRATE1
DSKCHG
11
1
1
DSKCHG (Bit 7):
This bit indicates the complement of the DSKCHG# input.
Bit 6-3: These bits are always a logic 1 during a read.
DRATE1 DRATE0 (Bit 2, 1):
These two bits select the data rate of the FDC. Refer to the DR register bits 1 and 0 for the settings
corresponding to the individual data rates.
HIGHDENS#(Bit 0):
0
500 KB/S or 1 MB/S data rate (high density FDD)
1
250 KB/S or 300 KB/S data rate


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