ACTiSYS ACT IR100SLM - Manual (Page 8)

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ACT-IR100SL and IR100SL-M User’s Manual
Version 1.20
May 27, 2002
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.
t
t
NRZ
RZI
NRZ
RZI