FT231XQ-R datasheet(34/45 Pages) FTDI

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FT231X USB TO FULL HANDSHAKE UART IC

Datasheet

Version 1.2

Document No.: FT_000565 Clearance No.:

FTDI# 261

8.2 Methods of Programming the MTP Memory

8.2.1 Programming the MTP memory over USB

The MTP memory on all FT-X devices can be programmed over USB. This method is the same as for the

EEPROM on other FTDI devices such as the FT232R. No additional hardware, connections or programming

voltages are required. The device is simply connected to the host computer in the same way that it would

be for normal applications, and the FT_Prog utility is used to set the required options and program the

device.

The FT_Prog utility is provided free-of-charge from the FTDI website, and can be found at the link below.

The user guide is also available at this link.

http://www.ftdichip.com/Support/Utilities.htm#FT_Prog

Additionally, D2XX commands can be used to program the MTP memory from within user applications.

For more information on the commands available, please see the D2XX Programmers Guide below.

http://www.ftdichip.com/Support/Documents/ProgramGuides/D2XX_Programmer’s_Guide(FT_000071).p

8.3 Memory Map

The FT-X family MTP memory has various areas which come under three main categories:



User Memory Area



Configuration Memory Area (writable)



Configuration Memory Area (non-writable)

Memory Area Description

Word Address

User Memory Area 2

Accessible via USB

0x3FF – 0x80

Configuration Memory Area

Accessible via USB

0x7E – 0x50

Configuration Memory Area

Cannot be written

0x4E – 0x40

User Memory Area 1

Accessible via USB

0x3E – 0x12

Configuration Memory Area

Accessible via USB

0x10 – 0x00

Figure 8.1: Simplified memory map for the FT-X

User Memory Area

The User Memory Areas are highlighted in Green on the memory map. They can be read and written via

USB on the FT231X. All locations within this range are freely programmable; no areas have special

functions and there is no checksum for the user area.

Note that the application should take into account the specification for the number of write cycles in

Section 5.4 if it will be writing to the MTP memory multiple times.

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