SIO1007 datasheet(19/108 Pages) MICROCHIP

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DS00002020A-page 19

SIO1007

APPLICATION NOTE: The system design must include weak pullup resistors in the docking station (~100KOhm)

on the DLAD[3:0] and DLFRAME# signals to maintain an inactive docking LPC interface.

8.2

PortSwitch Docking Controls

The SIO1007 provides three programmable bits which independently control the switching of the 14.318MHz clock and

the dedicated docking PCICLK and the remainder of the LPC interface. The switching is provided in the Docking LPC

Switch Register described in Section 8.3.1.

8.3

Registers

8.3.1

LOGICAL DEVICE FOR LPC DOCKING.

The LPC Docking Base Address Registers (CR3B and CR3C) are used to select the base address of LPC Docking run-

time register space. Valid addresses for LPC Docking runtime register space can be set to locations on single-byte

boundaries from 100H - FFFH. To disable LPC Docking runtime register decoding, set the Docking Activate Register

(CR3A)-bit 3 to ‘0’. When writing the LPC Docking Base Address registers (CR3B and CR3A) the set LPC Docking Acti-

vate Register (CR3A) -bit 3 must be set to ‘0’.

For detailed description of the LPC Docking Activate Register (CR3A) and the LPC Docking Base Address Registers

(CR3B and CR3C.) See Section 18.0 for details description of Configuration Registers.

8.3.2

DOCKING LPC SWITCH REGISTER

The Docking LPC Switch Register controls the connection and disconnection of the Docking LPC Interface.

DLPC_SWITCH – D0

When DLPC SWITCH is asserted ‘1’, the bi-directional Docking LPC switches will be switched on and the DLPC pin

connections will be connected to the LPC bus. When DLPC SWITCH is deasserted ‘0’, the DLPC pin connections will

be disconnected from the LPC bus.

TABLE 8-1:

LPC DOCKING INTERFACE

Host Side Interface

Dock Side Interface

Switch Control Bit

LAD[3:0]

DLAD[3:0]

DLPC_SWITCH

LFRAME#

DLFRAME#

DLPC_SWITCH

LDRQ1#

DLDRQ1#

DLPC_SWITCH

NCLKRUN

NDCLKRUN

DLPC_SWITCH

SER_IRQ

DLPC_SWITCH

LPC_CLK_33

DLPC_CLK_33

DCLK_33

SIO_14M

DSIO_14M

DCLK_14

TABLE 8-2:

DOCKING LPC SWITCH REGISTER

Address

DLPC Runtime Registers Base

Address + 0

Power

VCC

DEFAULT

00h

TYPE

RRR

R/W

BIT Name

RESERVED

DCLK_1

DCLK_3

DLPCSWITCH

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