PC87372 datasheet(53/144 Pages) NSC

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3.0 Device Architecture and Configuration (Continued)

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3.12 KEYBOARD AND MOUSE CONTROLLER (KBC) CONFIGURATION

3.12.1 General Description

The KBC is implemented physically as a single hardware module and houses two separate logical devices: a Mouse con-

troller (Logical Device 5) and a Keyboard controller (Logical Device 6). The KBC is functionally equivalent to the industry

standard 8042A Keyboard controller. Technical references for the standard 8042A Keyboard Controller may serve as de-

tailed technical references for the KBC.

The Keyboard and Mouse Controller runtime registers are described in Section 9.4 on page 119. All the registers are VDD3

powered.

3.12.2 Logical Devices 5 and 6 (Mouse and Keyboard) Configuration

Tables 20 and 21 list the configuration registers that affect the Mouse and Keyboard logical devices. Only the last register

(F0h) is described here. See Section 3.2.3 on page 32 for descriptions of the other configuration registers. The KBC module

is activated and the access to the runtime registers (pointed at by the base addresses at indexes 60h-63h) is enabled when

either the Mouse logical device (5) or the Keyboard logical device (6) is activated (by setting the activation bit at index 30h).

Because the IRQ configuration resources are separate for each logical device (Mouse or Keyboard), the specific logical de-

vice must be activated to enable its IRQ resources. All of these registers are VDD3 powered, with the exception of the KBC

Configuration register (F0h), which is both VDD3 and VSB3 powered.

Table 20. Mouse Conﬁguration Registers

Index

Mouse Conﬁguration Register or Action

Type

Power Well

Reset

30h

Activate (see Section 3.2.3 on page 32). When the Mouse of the KBC is

inactive, the IRQ selected by the Mouse Interrupt Number and Wake-Up on IRQ

Enable register (index 70h) are not asserted.

R/W

VDD3

00h

70h

Mouse Interrupt Number and Wake-Up on IRQ Enable register

R/W

VDD3

0Ch

71h

Mouse Interrupt Type. Bits 1,0 are read/write; other bits are read only.

R/W

VDD3

02h

74h

Report no DMA assignment

VDD3

04h

75h

Report no DMA assignment

VDD3

04h

Table 21. Keyboard Conﬁguration Registers

Index

Keyboard Conﬁguration Register or Action

Type

Power Well

Reset

30h

Activate (see Section 3.2.3 on page 32). When the Keyboard of the KBC is

inactive, the IRQ selected by the Keyboard Interrupt Number and Wake-Up on

IRQ Enable register (index 70h) are not asserted.

R/W

VDD3

00h

60h

Base Address MSB register. Bits 7-3 (for A15-11) are read only, ‘00000’.

R/W

VDD3

00h

61h

Base Address LSB register. Bits 2-0 (for A2-0) are read-only, ‘000’.

R/W

VDD3

60h

62h

Command Base Address MSB register. Bits 7-3 (for A15-11) are read only,

‘00000’.

R/W

VDD3

00h

63h

Command Base Address LSB. Bits 2-0 (for A2-0) are read-only, ‘100’.

R/W

VDD3

64h

70h

KBD Interrupt Number and Wake-Up on IRQ Enable register

R/W

VDD3

01h

71h

KBD Interrupt Type. Bits 1,0 are read/write; others are read only.

R/W

VDD3

02h

74h

Report no DMA assignment

VDD3

04h

75h

Report no DMA assignment

VDD3

04h

F0h

KBC Conﬁguration register

R/W

VDD3/VSB3

40h

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