MEC1632 datasheet(191/636 Pages) MICROCHIP

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DS00001592B-page 191

MEC1632

10.1.3

BLOCK DIAGRAM SIGNAL LIST

10.2

Power, Clocks and Reset

10.2.1

POWER DOMAIN

This block is powered by VTR.

See Section 7.1.1, "Power Configuration," on page 95 for details on power domains.

10.2.2

CLOCKS

This block has four clock inputs: LPC Bus Clock, 1MHZ (MCLK_DIV20_EN_HST) clock source. LPC Bus Clock is used

to the accessible and clock the registers in this block. The 1MHz Host Clock Domain is used to clock the counter in the

CPU_RESET circuitry.

See Section 7.4, "Clock Generator," on page 98 for details on clocks.

10.3

Power On Reset

This block is reset on a nSYS_RST and nSIO_RESET. On a reset, all Register are reset to 00h and the state machines

are set to idle.

See Section 7.6, "Reset Interface," on page 124 for details on reset.

10.4

Interrupts

The 8042 Emulated Keyboard Controller can generate a KBD_OBF interrupt when the OBF bit in the Keyboard Status

Read Register is cleared (falling edge sensitive) and a KBD_IBF interrupt when the IBF bit in the Keyboard Status Read

10.4.1

8042 EMULATED KEYBOARD CONTROLLER (LDN 1H) SIRQ ROUTING

The 8042 Emulated Keyboard Controller can generate two SIRQ events for the EC-to-HOST EC events:KIRQ & MIRQ.

For the KIRQ interrupt the Interrupt Configuration Register, SELECT on page 72 is cleared to ‘0’ and for MIRQ the Inter-

rupt Configuration Register, SELECT is set to’1’.

See Logical Device Configuration, Section 5.7, "SERIRQ Interrupts," on page 71.

10.5

Instance Description

There are two blocks defined in this chapter: 8042 MSG Interface and the Port92-Legacy. The MEC1632 has one

instance of each block.

TABLE 10-1:

8042 Emulated Keyboard Controller SIGNAL LIST

Signal Name

Direction

Description

EC_IBF

Output

Interrupt generated by the host writing either data or command to

the data register

EC_OBF

Output

Interrupt generated by the host reading either data or aux data

from the data register

KIRQ

Output

Routed to the Host SIRQ

MIRQ

Output

Routed to the Host SIRQ

KBRST

Output

Routed to Pin Function

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