KB3910 Просмотр технического описания (PDF) - Unspecified

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Компоненты Описание

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KB3910

Keyboard Controller

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3. Pin Descriptions

KB3920 Keyboard Controller Datasheet

3.1 Hardware Strap

Hardware strap pins are used to latch the external signal levels at the rising edge of ECRST#.

Either a High or Low value will be stored internally to serve as control signals as described below.

For normal application, there is no application component required for selecting the normal

mode because KB3920 has built-in internal pull-up resistor for selecting the right operation mode.

Pin Name Pin No. HW Strap Value

TP_TEST*

(GPIO20, KSO0)

47

TP_PLL*

(GPIO21, KSO1)

48

TP_SPI*

(GPIO22, KSO2)

49

TP_ISP*

(GPIO23, KSO3)

50

TP_TEST: Clock Test Mode

LOW: Test Mode.

HIGH: 32KHz clock in normal running (MUST, Power-On Default)

TP_PLL: DPLL Test Mode

LOW: Test Mode.

HIGH: Normal operation (MUST, Power-On Default)

TP_SPI : Default flash access

LOW : Boot from SPI flash part.

HIGH : Boot from ISA flash part (Power-On Default)

TP_ISP : In system programming mode

LOW : ISP mode.

HIGH : Normal Mode (Power-On Default)

* For these hardware straps, there is a pull-up resistor embedded in the chip. For hardware

strap value at high, no pull-up resistor is needed. Pull-low resistor is only required if hardware

strap value is at low.

3.2 Pin Descriptions by Functionality

3.2.1 Low Pin Count Interface Pin Descriptions

Pin Name Pin No Direction Description

LAD[3:0] 6,9,10,

12

LFRAME# 5

PCIRST# 15

PCICLK 14

SERIRQ 3

CLKRUN# 44

I/O

I

I

I

I/OD

I/OD

LPC LAD[3:0]

LPC: The LFRAME# signal

The PCIRST# signal used to reset the embedded LPC module

The 33MHz PCI Clock Input

SERIRQ#

CLKRUN#

3.2.2 X-BUS Interface Pin Descriptions

Pin Name Pin Direction

No

RD# 135

O

WR# 136

O

SELMEM# 144

O

SELIO# 97

O

SELIO2# 84

O

D[7:0]

I/O

Description

Read pulse

Write pulse

Memory cycle chip select pulse

I/O cycle chip select pulse

I/O cycle chip select pulse. This is a derivative of SELIO#

Data Bus

Copyright©2006, ENE Technology Inc.

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