FT4232HL datasheet(13/55 Pages) FTDI

13 / 55 page

FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC

Datasheet

Version 2.4

Document No.: FT_000060 Clearance No.: FTDI#78

3.1.4.3

FT4232H pins used in an MPSSE

The FT4232H 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 FT4232H’s channels (e.g. channel A) 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 MPSSE channel (e.g. channel B) would be available for another serial interface function while channel

C and channel D can be configured as UART or bit-bang mode. 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 in Table 3.7

Channel A

Pin No.

Channel B

Pin No.

Name

Type

MPSSE Configuration Description

TCK/SK

OUTPUT

Clock Signal Output. For example:

JTAG – TCK, Test interface clock

SPI – SK, Serial Clock

TDI/DO

OUTPUT

Serial Data Output. For example:

JTAG – TDI, Test Data Input

SPI – DO, serial data output

TDO/DI

INPUT

Serial Data Input. For example:

JTAG – TDO, Test Data output

SPI – DI, Serial Data Input

TMS/CS

OUTPUT

Output Signal Select. For example:

JTAG – TMS, Test Mode Select

SPI – CS, Serial Chip Select

GPIOL0

I/O

General Purpose input/output

GPIOL1

I/O

General Purpose input/output

GPIOL2

I/O

General Purpose input/output

GPIOL3

I/O

General Purpose input/output

Table 3.7 Channel A and Channel B MPSSE Configured Pin Descriptions

For a functional description of this mode, please refer to section 4.4.

When either Channel A or Channel B or both channels are used in MPSSE mode, Channel C and Channel D

can be configured as asynchronous serial interface (RS232/422/485) or Bit-Bang mode or a combination of

both.

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