ACTiSYS IR100SLM user manual Applications Embedded IrDA protocol stack, SIR IrPHY encoder-decoder

ACT-IR100SL and IR100SL-M User’s Manual

3. Applications

3.1 Embedded IrDA protocol stack

The mandatory IrDA protocol layers, IrLAP (comply with TEST frame capability requirement) and IrLMP (including IAS) are handled by ACT-IR100S-L/LM, In addition, TinyTP, IrCOMM, IrLPT, IrOBEX transport are all included.

The incoming/outgoing IrDA user data payload are buffered and then transferred to/from the host. The baud rates of IrDA traffic and host interface are independent of each other. The flow controls of IrDA traffic and host interface are also independent of each other.

3.2 SIR IrPHY encoder-decoder

The ACT-IR220VACF chip use in this adapter is an IrPHY encoder-decoder. It translates UART or RS232 NRZ signals to/from IrPHY SIR code (RZI modulation).

The ACT-IR220VACF is a half-duplex infrared communication processor for exchanging data from IR and RS232, ACT-IR220VACF cover data baud rate between 9.6kbps and 115.2kbps.

The IrPHY specification allows two kinds of modulations: 3/16 of a bit duration pulse, or minimum pulse duration of 1.63 us, we use minimum pulse duration of 1.63 us to modulation bit data.