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11.1.2
Functional Block Diagram of FIR
Internal Bus Interface
FIR TX/RV FIFO FIR
related register
FIR MODEM
FIR Flow
SIR Flow
HP-SIR / Sharp-ASK
MODEM
UART
(16550 compatible)
Figure 11.1 Functional Block Diagram of FIR
The FIR module contains five blocks. The Internal Bus Interface block implements the logic
between FIR core and internal bus. The FIR TX/RV FIFO and FIR related register block
implements data flow control from host to FIR MODEM. It contains transmitting FIFO, receiving
FIFO and some registers to manage the FIFO operations. The related registers will be described in
the later section. The FIR MODEM block contains the parallel data to/from serial data logic. This
block also implements encoding the serial data to 4M mode bit stream. The UART block is
designed to be compatible with 16550. This block is for parallel to/from serial data transfer. The
function of baud rate generation is also featured in this block. HP-SIR and Sharp-ASK MODEM
block is encoding and decoding from/to serial data to/from SIR data bit stream.
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