w83l950d Winbond Electronics Corp America, w83l950d Datasheet - Page 44

• Manufacturer Part Number: w83l950d
• Description: Peripheral Personal Computer Keyboard Controller
• Manufacturer: Winbond Electronics Corp America

10. BUS INTERFACE AND GATEA20 / KBRESET/ PORT92H
10.1 Data Bus Buffer Control Register (DBBCON)
SFR address.
Default value.
Bit 7: Bus protocol select
Bit 6: Input level selection bit
Bit 5: OBF10 output enable bit
ISA MODE = 0: GP46 function as I/O Port
LPC MODE = 0: disable SERIAL IRQ source for OBF10 (SIRQ2).
Bit 4: OBF01 output enable bit
ISA MODE
LPC MODE = 0: disable SERIAL IRQ source for OBF01 (SERIRQ12).
Bit 3: OBF00 output enable bit
ISA MODE
LPC MODE = 0: disable SERIAL IRQ source for OBF00 (SERIRQ1).
Bit 2: OBF0 output selection bit
Bit 1: Data bus buffer function selection bit
Bit 0: Data bus buffer enable bit
= 1: Double data bus buffer mode (GP47 function as
= 1: Data bus buffer enabled.
= 1: enable SERIAL IRQ source for OBF10 (SIRQ2).
= 0: GP43 function as I/O Port.
= 0: GP42 function as I/O Port
= 1: GP42 function as OBF00 output pin (IRQ1)
= 1: enable SERIAL IRQ source for OBF00 (SERIRQ1).
= 0: OBF00 valid (IRQ1)
= 1: OBF01 valid (IRQ12)
= 0: Single data bus buffer mode (GP47 function as I/O port)
= 0: P50 – P53, GP8 I/O port.
0xDA
0x00
= 0 ISA BUS SELECT
= 1 LPC BUS SELECT
= 0 CMOS level input.
= 1 TTL level input.
= 1: GP46 function as OBF10 output pin (SCI)
= 1: GP43 function as OBF01 output pin (IRQ12).
= 1: enable SERIAL IRQ source for OBF01 (SERIRQ12).
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Publication Release Date: June 23, 2003
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W83L950D
Revision 1.0