IRCC SMSC Corporation, IRCC Datasheet - Page 64

• Manufacturer Part Number: IRCC
• Description: INFRARED COMMUNICATIONS CONTROLLER
• Manufacturer: SMSC Corporation

The FIFO must be loaded with the appropriate
transmit data while the Block Control bits in SCE
Configuration Register A are set to the required
transfer mode with the SCE MODES bits set to
Transmit/Receive Disabled. Enough room must
remain in the FIFO for receive data.
Loopback Transmit CRC bit (D6) in SCE
Configuration Register B must be initialized for
the appropriate CRC response during loopback
testing.
properly initialized to constrain the loopback
function so that received data is not re-
transmitted. The Rx Data Size register is
required for Consumer IR Loopback tests and
the Tx Data Size register is required for IrDA FIR
Loopback tests. The RX Data Size register must
The Data Size registers must be
The
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number of bytes in the CIR loopback test; i.e.,
Test_byte_count_1. Proper programming of the
Tx Data Size register depends upon the state of
the CRC Select and Loopback Tx CRC bits. The
FIFO Threshold is not used for loopback tests.
The Tx Polarity and Rx Polarity bits must be the
same state for loopback tests. Set the Loopback
bit in SCE Configuration Register B to begin the
loopback test.
Retrieving Results
The loopback test data can be read from the
FIFO immediately following the End-of-Message;
i.e., the Loopback bit does not need to be reset,
nor does the FIFO need to be explicitly re-
configured for ISA bus access.