Mir Encoder/Decoder; Sip Generation - Texas Instruments OMAP5912 Reference Manual

Multimedia processor device overview and architecture

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MIR Encoder/Decoder

MIR Baud-Rate Adjustment Mechanism

In order to meet MIR baud-rate tolerance of ±0.1% with a 48-Mhz clock input,

a 42−41−42 encoding/decoding adjustment is performed. The reference start

start flag, and the 42−41−42 cyclic pattern is repeated until the stop

flag is sent or detected. The jitter created this way is within MIR tolerances. The

pulse width is not exactly 1/4 but within tolerances defined by the IrDA

specifications.

baud adjustment cyclic pattern (3 MIR periods)

In MIR and FIR operation modes, the transmitter needs to send a serial

infrared interaction pulse (SIP) at least once every 500 ms. The purpose of the

SIP is to let slow devices (operating in SIR mode) know that the medium is

currently occupied.

The SIP pulse is shown below in Figure 68.

Serial infrared

interaction pulse

Serial Interfaces

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