Document No.: FT_000061
FT2232H DUAL HIGH SPEED USB TO MULTIPURPOSE UART/FIFO IC
Datasheet Version 2.09
Clearance No.: FTDI#77
3.4.5 FT2232H pins used in an MPSSE
The FT2232H channel A and channel B each have a Multi-Protocol Synchronous Serial Engine (MPSSE).
Each MPSSE can be independently configured to a number of industry standard serial interface protocols
such as JTAG, I2C or SPI, or it can be used to implement a proprietary bus protocol. For example, it is
possible to use one of the FT2232H‟s channels to connect to an SRAM configurable FPGA such as supplied
by Altera or Xilinx. The FPGA device would normally be un-configured (i.e. have no defined function) at
power-up. Application software on the PC could use the MPSSE to download configuration data to the
FPGA over USB. This data would define the hardware function on power up. The other FT2232H channel
would be available for another function. Alternatively each MPSSE can be used to control a number of
GPIO pins. When configured in this mode, the pins used and the descriptions of the signals are shown
Channel A
Pin No.
Channel B
Pin No.
Name
Type
MPSSE Configuration Description
Clock Signal Output. For example:
16
38
TCK/SK
OUTPUT
JTAG – TCK, Test interface clock
SPI – SK, Serial Clock
Serial Data Output. For example:
17
39
TDI/DO
OUTPUT
JTAG – TDI, Test Data Input
SPI – DO
Serial Data Input. For example:
18
40
TDO/DI
INPUT
JTAG – TDO, Test Data output
SPI – DI, Serial Data Input
Output Signal Select. For example:
19
41
TMS/CS
OUTPUT
JTAG – TMS, Test Mode Select
SPI – CS, Serial Chip Select
21
22
23
24
26
27
28
29
30
32
33
34
43
44
45
46
48
52
53
54
55
57
58
59
GPIOL0
GPIOL1
GPIOL2
GPIOL3
GPIOH0
GPIOH1
GPIOH2
GPIOH3
GPIOH4
GPIOH5
GPIOH6
GPIOH7
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
General Purpose input/output
General Purpose input/output
General Purpose input/output
General Purpose input/output
General Purpose input/output
General Purpose input/output
General Purpose input/output
General Purpose input/output
General Purpose input/output
General Purpose input/output
General Purpose input/output
General Purpose input/output
Table 3.8 Channel A and Channel B MPSSE Configured Pin Descriptions
For a functional description of this mode, please refer to section 4.6 MPSSE Interface Mode Description.
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