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FT81x Block Diagram
FT81x with EVE (Embedded Video Engine) technology simplifies the system architecture for advanced Human Machine
Interfaces (HMIs) by providing support for display, touch, and audio as well as an object oriented architecture approach
that extends from display creation to the rendering of the graphics.
Serial Host Interface
By default the SPI slave operates in the SINGLE channel mode with MOSI as input from the master and MISO as output
to the master. DUAL and QUAD channel modes can be configured through the SPI slave itself. To change the channel
modes, write to register REG_SPI_WIDTH. Please refer to the table below:
REG_SPI_WIDTH[1:0]
Channel Mode
Data Pins
Max Bus Speed
00
SINGLE (default)
MISO, MOSI
30MHz
01
DUAL
IO0, IO1
30MHz
10
QUAD
IO0, IO1, IO2, IO3
25MHz
11
Reserved
-
-
For more details on the FT81x SPI interface, please refer to pages 13-15 of the official FT81x Datasheet:
http://www.ftdichip.com/Support/Documents/DataSheets/ICs/DS_FT81x.pdf
For the REG_SPI_WIDTH register definition, please refer to page 87 of the official FT81x Series Programmers Guide:
http://www.ftdichip.com/Support/Documents/ProgramGuides/FT81X_Series_Programmer_Guide.pdf
