參數資料
型號: W83627SF
英文描述: W83627F plus Smart Card Reader Interface. VID Control. GP I/O?
中文描述: W83627F加上智能卡閱讀器接口。 VID控制。大獎賽的I / O?
文件頁數: 52/147頁
文件大小: 1348K
代理商: W83627SF
W83627SF
PRELIMINARY
Publication Release Date: Nov. 2000
- 45 - Revision 0.60
3.2.8
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 of
DSKCHG#
,
while other bits of the data bus remain in tri-state. Bit definitions are as follows:
x
x
Reserved for the hard disk controller
During a read of this register, these bits are in tri-state
DSKCHG
x
x
x
x
x
x
0
1
2
3
4
5
6
7
In the PS/2 mode, the bit definitions are as follows:
1
2
3
4
5
6
7
0
HIGH DENS
DRATE0
DRATE1
DSKCHG
1
1
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.
HIGH DENS# (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
In the PS/2 Model 30 mode, the bit definitions are as follows:
1
2
3
4
5
6
7
0
DRATE0
DRATE1
NOPREC
DMAEN
DSKCHG
0
0
0
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