LPC47N237-MD datasheet(71/138 Pages) SMSC

Part #	LPC47N237-MD

Description	3.3V I/O CONTROLLER FOR PORT REPLICATORS AND DOCKING STATIONS

PDF	138 Pages

Scroll/Zoom	100%

Manufacturer	SMSC [SMSC Corporation]

Direct Link	http://www.smsc.com

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71 / 138 page

3.3v I/O Controller for Port Replicators and Docking Stations

SMSC DS – LPC47N237

Page 71

Revision 0.3 (10-26-04)

DATASHEET

11.1.7 Reset and Initialization

The SER_IRQ bus uses nPCI_RESET as its reset signal. The SER_IRQ pin is tri-stated by all agents while

nPCI_RESET is active. With reset, SER_IRQ Slaves are put into the (continuous) IDLE mode. The Host

Controller is responsible for starting the initial SER_IRQ Cycle to collect system’s IRQ/Data default values.

The system then follows with the Continuous/Quiet mode protocol (Stop Frame pulse width) for

subsequent SER_IRQ Cycles. It is Host Controller’s responsibility to provide the default values to 8259’s

and other system logic before the first SER_IRQ Cycle is performed. For SER_IRQ system suspend,

insertion, or removal application, the Host controller should be programmed into Continuous (IDLE) mode

first. This is to guarantee SER_IRQ bus is in IDLE state before the system configuration changes.

LPC47N237-MD Datasheet(PDF) 71 Page - SMSC Corporation