37C957FR Datasheet, PDF (200/328 Pages) SMSC Corporation – ULTRA I/O CONTROLLER FOR PORTABLE APPLICATIONS

8051 R/W
System
R/W
Bit Def
D7-D4
D3
N/A
N/A
R
R/W
Reserved 1 = 8051-to-system mailbox has been written to.
This bit is cleared by a read of Mailbox Register 1
D2-D0
N/A
R
Reserved
PS/2 Interface Description
PS/2 Port Control registers
Port 1
Host
N/A
8051
0x7F41
Power
VCC2
Default
0x00
Port 2
N/A
0x7F49
VCC2
0x00
D7
D6
D5
R/W
R
R
R
PS/2 Reserved Reserved Reserved
port1
PS/2 Reserved Reserved Reserved
port2
Only one of bits 2-0 can be set to one.
D4
R/W
EM_EN
IM_EN
D3
R/W
KB_EN
PS2_EN
D2
R/W
Inhibit
Inhibit
D1
R/W
RX_EN
D0
R/W
TX_EN
RX_EN TX_EN
PS/2 Port Status registers
Port 1
Host
N/A
8051
0x7F42 (R)
Power
VCC2
Default
0x00
Port 2
N/A
0x7F4A (R)
VCC2
0x00
R/W
PS/2
port1
PS/2
port2
D7
R
Reserved
D6
R
Reserved
D5
R
EM_busy
D4
R
KB_busy
Reserved Reserved IM_busy PS2_busy
D3
R
Inhibit
done
Inhibit
done
D2
D1
R
R
EM_drdy KB_drdy
D0
R
Error
IM_drdy PS2_drdy Error
194