FT4222HQ-C-R Datasheet, PDF (14/49 Pages) Future Technology Devices International Ltd. – USB2.0 to QuadSPI/I2C Bridge IC

FT4222H USB2.0 TO QUADSPI/I2C BRIDGE IC
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Document No.: FT_001011 Clearance No.: FTDI#405
5 FT4222H Chip Mode Configuration and SPI/I²C Interface
5.1 Chip Mode Configuration
The FT4222H has 4 configuration modes selected by {DCNF1, DCNF0}. The chip configuration mode will
determine the number of USB interfaces for data streams and for GPIO control. The data stream interface
is for data transfer between the USB2.0 host and the SPI/ I²C device. The purpose of the GPIO interface
is for fully controlling the GPIOs. The following table shows the pin functions corresponding to the chip
configuration mode.
Table 5.1 FT4222H Pin Functions on Chip Configuration Mode
*One of the SPIM, SPIS, I²C function is selected, the other 2 functions will be disabled
Note that GPIOx pins cannot be controlled by the software driver when GPIOx pins play the role as SPIM
SSxO, I²C SCL/SDA, SUSP or WAKE.
Chip Configuration only determines the number of interface/functions supported but do not decide which
bus interface (SPI/ I²C /GPIO) or which role (master/slave) that the FT4222H will take. The user can use
the initialisation APIs provided by the support library, LibFT4222, to configure which interface and role
will be taken.
The support library for FT4222H, LibFT4222, which is based on D2XX, provides high-level and convenient
APIs (Application Programming Interface) to speed up user application development. For further details
refer to the User Guide For LibFT4222.
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