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W83977EF-AW Datasheet(PDF) 73 Page - Winbond |
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W83977EF-AW Datasheet(HTML) 73 Page - Winbond |
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73 / 142 page  W83977EF-AW/W83977EG-AW Publication Release Date: Apr. 2006 -71- Revision 1.2 Continued. COMMAND FUNCTION ABh Interface Test 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 Disable Keyboard Interface AEh Enable Keyboard Interface C0h Read Input Port(P1) and send data to the system C1h Continuously puts the lower four bits of Port1 into STATUS register C2h Continuously puts the upper four bits of Port1 into STATUS register D0h Send Port2 value to the system D1h Only set/reset GateA20 line based on the system data bit 1 D2h Send data back to the system as if it came from Keyboard D3h Send data back to the system as if it came from Auxiliary Device D4h Output next received byte of data from system to Auxiliary Device E0h Reports the status of the test inputs FXh Pulse only RC(the reset line) low for 6 μS if Command byte is even 8.5 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: 8.5.1 KB Control Register (Logic Device 5, CR-F0) BIT 7 6 5 4 3 2 1 0 NAME KCLKS1 KCLKS0 Reserved Reserved Reserved P92EN HGA20 HKBRST KCLKS1, KCLKS0 This 2 bits are for the KBC clock rate selection. = 0 0 KBC clock input is 6 Mhz = 0 1 KBC clock input is 8 Mhz = 1 0 KBC clock input is 12 Mhz = 1 1 KBC clock input is 16 Mhz P92EN (Port 92 Enable) A "1" on this bit enables Port 92 to control GATEA20 and KBRESET. A "0" on this bit disables Port 92 functions. |
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