IRCC datasheet(39/79 Pages) SMSC

39 / 79 page

to 1) constrain the transmitter to a valid IrDA

frame size, 2) simplify multi-frame windowing for

transmit data blocks that are larger than the

maximum packet size and, 3) constrain the SCE

transmitter during loopback testing. NOTE: only

the Tx Data Size register is used for IrDA FIR

loopback testing; only the Rx Data Size register

is required for Consumer IR loopback tests. If

the Tx Data Size register is zero, the IrDA

transmit message size is unlimited; i.e., the

transmitter will operate until the FIFO is empty.

The Tx Data Size High register is the Tx Data

Size high nibble.

Tx Data Size Low (Address 4)

The Tx Data Size Low register is the Tx Data

Size low byte.

Rx Data Size High (Address 5)

Rx Data Size High, bits 0 - 3

The Rx Data Size register specifies the IrLAP-

negotiated maximum number of payload data

bytes per IrDA receive message frame.

This

frame for valid data size and to constrain the

SCE receiver during Consumer IR loopback

testing. NOTE: only the Rx Data Size register is

required for Consumer IR loopback tests; only

the Tx Data Size register is required for IrDA FIR

loopback tests.

For Consumer IR loopback

tests, program the Rx Data Size register with

Test_byte_count_1. If the Rx Data Size register

is zero the IrDA receive message size is

unlimited; i.e., a size error cannot occur because

frame size checking is disabled. The Rx Data

Size High register is the Rx Data Size high

nibble.

Rx Data Size Low (Address 6)

The Rx Data Size Low register is the RxData

Size low byte.

IRCC Folha de dados(PDF) 39 Page - SMSC Corporation