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To use SIR or ASK transfer protocol, the data flow is from host to UART, and to HP-SIR
MODEM:
1. Host sets SIR Register (ISIRR) to HP-SIR MODEM (see FIR Controller registers description
in section 11.2.2 on the next page.)
2. Host writes the data to the UART for transmission. (host reads data from UART for data
receiving)
3. UART converts parallel data into serial data for transmission. (UART converts serial data into
parallel data for data receiving)
4. HP-SIR and SHARP-ASK MODEM implements encoding serial data into bit stream for
transmission (decoding bit stream into serial data for data receiving)
For FIR transfer protocol, the data flow is from host to FIR TX/RV FIFO, and to FIR MODEM:
1. Host sets SIR Register (ISIRR) to FIR-MODEM (see FIR Controller registers description in
section11.2.2 on the next page.)
2. Host writes data into TX FIFO for transmission. (host reads data from RX FIFO for data
receiving)
3. FIR MODEM converts parallel data into serial data and implements encoding into bit stream
for transmission. (decoding the bit stream from optical medium and translates from serial data
to parallel data for data receiving)
Summary of Contents for HD64465
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