FDC37C672QFP SMSC Corporation, FDC37C672QFP Datasheet - Page 112

• Manufacturer Part Number: FDC37C672QFP
• Description: ENHANCED SUPER I/O CONTROLLER WITH FAST IR
• Manufacturer: SMSC Corporation

Chapter 17 8042 Keyboard Controller Description
Notes:
17.1
SMSC FDC37C672
KIRQ is the Keyboard IRQ
MIRQ is the Mouse IRQ
Port 21 is used to create a GATEA20 signal from the FDC37C672.
The FDC37C672 is a Super I/O and Universal Keyboard Controller that is designed for intelligent keyboard
management in desktop computer applications. The Super I/O supports a Floppy Disk Controller, two
16550 type serial ports one ECP/EPP Parallel Port.
The Universal Keyboard Controller uses an 8042 microcontroller CPU core. This section concentrates on
the FDC37C672 enhancements to the 8042. For general information about the 8042, refer to the "Hard-
ware Description of the 8042" in the 8-Bit Embedded Controller Handbook.
Keyboard ISA Interface
The FDC37C672 ISA interface is functionally compatible with the 8042 style host interface. It consists of
the D0-7 data bus; the nIOR, nIOW and the Status register, Input Data register, and Output Data register.
Table 17.1 shows how the interface decodes the control signals. In addition to the above signals, the host
interface includes keyboard and mouse IRQs.
8042A
TST0
TST1
P27
P10
P26
P23
P22
P11
Figure 17.1 - Keyboard and Mouse Interface
DATASHEET
Page 112
LS05
Enhanced Super I/O Controller with Fast IR
KDAT
KCLK
MCLK
MDAT
Rev. 10-29-03
Datasheet