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FT230XQ-R Datasheet(PDF) 34 Page - Future Technology Devices International Ltd. |
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FT230XQ-R Datasheet(HTML) 34 Page - Future Technology Devices International Ltd. |
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34 / 44 page  Copyright © Future Technology Devices International Limited 34 FT230X USB TO BASIC UART IC Version 1.4 Document No.: FT_000566 Clearance No.: FTDI# 260 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 FT230X. 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. Configuration Memory Area (writable) This area stores the configuration data for the device, including the data which is returned to the host in the configuration descriptors (e.g. the VID, PID and string descriptions) and also values which set the hardware configuration (the signal assigned to each CBUS pin for example). These values can have a significant effect on the behaviour of the device. Steps must be taken to ensure that these locations are not written to un-intentionally by an application which is intended to access only the user area. This area is included in a checksum which covers configuration areas of the memory, and so changing any value can also cause this checksum to fail. Configuration Memory Area (non-writable) This is a reserved area and the application should not write to this area of memory. Any attempt to write these locations will fail |
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