FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC
Datasheet
Version 2.4
Document No.: FT_000060 Clearance No.: FTDI#78
4.5 Synchronous & Asynchronous Bit-Bang Interface Mode Desc.
The FT4232H channel A, B, C or channel D can be configured as a bit-bang interface. There are two types
of bit-bang modes: synchronous and asynchronous.
4.5.1
Asynchronous Bit-Bang Mode
Asynchronous Bit-Bang mode is the same as BM-style Bit-Bang mode. On any channel configured in
asynchronous bit-bang mode, data written to the device in the normal manner will be self-clocked onto the
parallel I/O data pins (those which have been configured as outputs). Each I/O pin can be independently
set as an input or an output. The rate that the data is clocked out at is controlled by the baud rate
generator.
For the data to change there has to be new data written, and the baud rate clock has to tick. If no new
data is written to the channel, the pins will hold the last value written.
4.5.2
Synchronous Bit-Bang Mode
The synchronous Bit-Bang mode will only update the output parallel I/O port pins whenever data is sent
from the USB interface to the parallel interface. When this is done, data is read from the USB Rx FIFO
buffer and written out on the pins. Data can only be received from the parallel pins (to the USB Tx FIFO
interface) when the parallel interface has been written to.
With Synchronous Bit-Bang mode, data will only be sent out by the FT4232H if there is space in the
FT4232H USB TXFIFO for data to be read from the parallel interface pins. This Synchronous Bit-Bang mode
will read the data bus parallel I/O pins first, before it transmits data from the USB RxFIFO. It is therefore 1
byte behind the output, and so to read the inputs for the byte that you have just sent, another byte must
be sent.
For example:-
(1) Pins start at 0xFF
Send 0x55,0xAA
Pins go to 0x55 and then to 0xAA
Data read = 0xFF,0x55
(2) Pins start at 0xFF
Send 0x55,0xAA,0xAA
(repeat the last byte sent)
Pins go to 0x55 and then to 0xAA
Data read = 0xFF,0x55,0xAA
Synchronous Bit-Bang Mode differs from Asynchronous Bit-Bang mode in that the device parallel output is
only read when the parallel output is written to by the USB interface. This makes it easier for the
controlling program to measure the response to a USB output stimulus as the data returned to the USB
interface is synchronous to the output data.
Asynchronous Bit-Bang mode is enabled using Set Bit Bang Mode driver command. A hex value of 1 will
enable Asynchronous Bit-Bang mode.
Synchronous Bit-Bang mode is enabled using Set Bit Bang Mode driver command. A hex value of 4 will
enable Synchronous Bit-Bang mode.
See application note AN2232-02, “Bit Mode Functions for the FT2232” for more details and examples of
using the bit-bang modes.
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