參數(shù)資料
型號： W83977CTF-AW
英文描述： PERIPHERAL (MULTIFUNCTION) CONTROLLER
中文描述： 周邊（多功能）控制器
文件頁數(shù)： 90/161頁
文件大?。?/td> 592K
代理商： W83977CTF-AW
W83977EF/ CTF
PRELIMINARY
Publication Release Date: March 1999
-81 -
Revision A1
6.4 Commands, continued
COMMAND
ABh
FUNCTION
Interface Test
Disable Keyboard Interface
Enable Keyboard Interface
Read Input Port(P1) and send data to the system
Continuously puts the lower four bits of Port1 into STATUS register
Continuously puts the upper four bits of Port1 into STATUS register
Send Port2 value to the system
Only set/reset GateA20 line based on the system data bit 1
Send data back to the system as if it came from Keyboard
Send data back to the system as if it came from Auxiliary Device
Output next received byte of data from system to Auxiliary Device
Reports the status of the test inputs
Pulse only RC(the reset line) low for 6
μ
S if Command byte is even
BIT
04
03
02
01
00
BIT DEFINITION
No Error Detected
Keyboard "Clock" line is stuck low
Keyboard "Clock" line is stuck high
Keyboard "Data" line is stuck low
Keyboard "Data" line is stuck high
ADh
AEh
C0h
C1h
C2h
D0h
D1h
D2h
D3h
D4h
E0h
FXh
6.5 Hardware GATEA20/Keyboard Reset Control Logic
The KBC implements a hardware control logic to speed-up GATEA20 and KBRESET. This control
logic is controlled by LD5-CRF0 as follows:
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