w83977ctf Winbond Electronics Corp America, w83977ctf Datasheet - Page 117

• Manufacturer Part Number: w83977ctf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

10.6 Logical Device 5 (KBC)
CR30 (Default 0x01 if PENKBC= 1 during POR, default 0x00 otherwise)
CR60, CR 61 (Default 0x00, 0x60 if PENKBC= 1 during POR, default 0x00 otherwise)
CR62, CR 63 (Default 0x00, 0x64 if PENKBC= 1 during POR, default 0x00 otherwise)
CR70 (Default 0x01 if PENKBC= 1 during POR, default 0x00 otherwise)
CR72 (Default 0x0C if PENKBC= 1 during POR, default 0x00 otherwise)
CRF0 (Default 0x83)
Bit 7 - 1: Reserved.
Bit 0:
These two registers select the first KBC I/O base address [0x100:0xFFF] on 1 byte boundary.
These two registers select the second KBC I/O base address [0x100:0xFFF] on 1 byte boundary.
Bit 7 - 4: Reserved.
Bit [3:0]: These bits select IRQ resource for KINT (keyboard).
Bit 7 - 4: Reserved.
Bit [3:0]: These bits select IRQ resource for MINT (PS2 Mouse)
Bit 7 - 6: KBC clock rate selection
Bit 5 - 3: Reserved.
Bit 2: = 0 Port 92 disable.
Bit 1: = 0 Gate20 software control.
Bit 0: = 0 KBRST software control.
= 1 Activates the logical device.
= 0 Logical device is inactive.
= 00 Select 6MHz as KBC clock input.
= 01 Select 8MHz as KBC clock input.
= 10 Select 12Mhz as KBC clock input.
= 11 Select 16Mhz as KBC clock input.
= 1 Port 92 enable.
= 1 Gate20 hardware speed up.
= 1 KBRST hardware speed up.
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Publication Release Date: March 1999
W83977EF/ CTF
PRELIMINARY
Revision A1