SIO1007 datasheet(18/108 Pages) MICROCHIP

18 / 108 page

SIO1007

DS00002020A-page 18

 2005 - 2015 Microchip Technology Inc.

8.0

LPC PORTSWITCH

The SIO1007 Portswitch

Interface provides a hot-switchable Docking LPC interface available to an external Super

I/O device contained within a docking station. The Docking LPC bus signals, when enabled, will be routed through low

impedance (

10), bi-directional switches contained in the SIO1007. The SIO1007 controls the enabling of the LPC

docking interface. When the SIO1007 LPC Docking interface is enabled, the SIO1007 autonomously blocks all trusted

LPC cycles while forwarding all standard LPC cycles to the LPC Docking interface.

A switchable PCICLK is available to be supplied to an external devices contained within a docking station. The SIO1007

Docking PCICLK output is a low skewed switched version of the input. which, when enabled, is routed through low

impedance (

10), bi-directional switch contained in the SIO1007. The SIO1007 controls the enabling of the Docking

PCICLK output.

A switchable 14.318MHz clock is available to external devices contained within a docking station. The SIO1007 Docking

14.318MHz clock output is a buffered version of the input. The SIO1007 controls the enabling of the Docking 14MHz

clock output.

See Figure 8-1.for an illustration of a System level docking solution using the LPC PortSwitch

Interface.

8.1

LPC PortSwitch Interface

The signals to be switched in the LPC PortSwitch interface are shown in Table 8-1. All signals except SIO_14M and

DSIO_14M are 3.3V only. SIO_14M and DSIO_14M are 5 Volt tolerant.

FIGURE 8-1:

DOCKING SOLUTION USING THE LPC PORTSWTICH

 INTERFACE

LPC Host

LPC

Peripheral

LPC

Docking

Switch

Docking

Connector

System

LPC

Master

Notebook

Ports

Dock

Ports

Notebook

Docking Station

Primary Super I/O

Docking Super I/O

Control

LPC BUS

(LAD{3:0], LFRAME#,

LDRQ0#, LDRQ1#,

SERIRQ, CLKRUN#,

LRESET#)

SWITCHED

LPC BUS

(DLAD[3:0],

DLFRAME#,

DLDRQ1#,

DSERIRQ,

DCLKRUN#)

Clock

Driver

ENB

14Mhz

33MHz

Switch

14MHz

Buffer

LPC_CLK_33

SIO_14M

DLPC_CLK_33

DSIO_14M

PCICLK

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