CIRCC datasheet(62/70 Pages) SMSC

Part #	CIRCC

Description	Consumer Infrared Communications Controller

PDF	70 Pages

Scroll/Zoom	100%

Manufacturer	SMSC [SMSC Corporation]

Direct Link	http://www.smsc.com

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62 / 70 page

FIFO Interrupt Interface

Transmit

Transmitting messages with Programmed I/O

using FIFO Interrupt requires writing a fixed

number of data bytes, usually related to the

threshold,

whenever

the

FIFO

Interrupt

becomes

active.

appropriate

FIFO

Threshold value allows the host to efficiently satsify

the FIFO service requests until the message

transmission is complete. For slow systems, the

FIFO can be manually filled with transmit data

before the transmitter is enabled.

NOTE: The

FIFO will automatically request service before the

transmitter is activated if the FIFO Threshold is

greater than zero.

DMA Enable

IOR

String Move

FIFO Data READ

Status READ

FIFO NOT EMPTY

FIGURE 29 - PROGRAMMED I/O READ TIMING

DMA Enable

IOW

String Move

FIFO Data WRITE

Status READ

FIFO FULL

FIGURE 30 - PROGRAMMED I/O WRITE TIMING

CIRCC Datasheet(PDF) 62 Page - SMSC Corporation