IRCC datasheet(63/79 Pages) SMSC

63 / 79 page

The SCE TV Remote receiver will abort on a

FIFO Overrun condition.

When the overrun

occurs the receiver is disabled, an EOM Interrupt

is sent, and the FIFO is flushed.

IRDA MULTI-FRAME WINDOW SUPPORT

The Tx Data Size register can be used with DMA

blocks that are larger than the size of an IrDA

message frame to support Multi-Frame Windows,

i.e. multiple unacknowledged message frames.

MFWs with a single DMA block can occur in both

Brick Walled and non-Brick Walled modes.

Non-Brickwalled MFWs

support

non-Brick

Walled

multi-frame

windows set the SCE Modes bits to zero and

setup the DMA controller with a block-size larger

than a single frame but smaller-than or equal-to

the Tx Data Size

× 8. Choose the appropriate

encoder, start the transmitter, and wait for an

EOM interrupt.

Repeat this procedure by

reseting and then re-enabling the transmitter

DMA block-size

÷ Tx Data Size times, until the

DMA block has been transferred.

Reset the

FIFO Threshold for the last frame, if necessary.

Brickwalled MFWs

To support Brick Walled Multi-Frame Windows

set the SCE Modes bits to zero and setup the

DMA controller with a block-size larger than a

single frame but smaller-than or equal-to the Tx

Data Size

× 8. Choose the appropriate encoder,

initialize the Brick Wall Count, and set the Brick

Wall bit. Start the transmitter and wait for DMA

block-size

÷ Tx Data Size EOF interrupts or poll

the message count bits; i.e., until the DMA block

has been transferred.

LOOPBACK MODE

Loopback mode allows diagnostic testing of the

IrDA FIR and Consumer IR encoders. Loopback

tests require that the SCE FIFO be used for both

transmit and receive modes, simultaneously.

The Data Size registers are used to constrain the

Loopback test. Brick Walled messages are not

supported in Loopback mode.

FIFO Full

EOM Interrupt

Rx Enable

Active Fram e

Active Fram e Int.

Zero Detect

Overrun

FIGURE 33 - TV REMOTE RX ABORT ON OVERRUN

IRCC Datasheet(PDF) 63 Page - SMSC Corporation

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