I've searched this forum for "FT245RL" and found a bunch of posts that I don't understand.
But this webpage gives some basic hint how the FTDI chips work:
https://www.ecstaticlyrics.com/electronics/USB/FT240X/This describes the FT240X but might be similar enough to the 245R that some info can be gleaned about how to control the data stream.
Quote:
Power is applied to (or received from, if USB-powered) the top left pin (positive) and the bottom-right pin (ground). The eight pins on the bottom are the data bus, delightfully sorted into numerical order unlike the chip itself. At the top right, the sequence FTRWR represents these signals, all of which are active-low.
F: The "SIWU#" pin, which flushes data in the FIFO to the PC immediately.
T: The "TXE#" pin, which indicates when data may be written to the FIFO.
R: The "RXE#" pin, which indicates when data is available to be read from the FIFO.
W: The "WR#" pin, which writes data into the FIFO to be sent to the PC.
R: The "RD#" pin, which reads data from the FIFO which came from the PC.
The other pins labeled 5 & 6 are the "CBUS5" and "CBUS6" pins, the exact function of which is configurable via USB using a utility from FTDI, but by default you can simply ignore them. The SIWU# pin (the one labeled "F") may also be ignored if you don't care to utilize it.
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