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Version 1.09
Figure 6: Flash configuration multiplexer
The control signals SPI_SEL, SPI_JTAG_EN# and SPI_CONFIG_EN# are connected to the Cypress FX3
USB 3.0 controller. For details refer to section 2.9.9.
2.9.3
Fifo Mode Multiplexer
The slave fifo interface between the FPGA module and the Cypress FX3 USB 3.0 controller can be
operated either in 16 or 32 Bit mode. The FX3_PMODE0 signal allows selecting between those two
modes. If 32 Bit mode is chosen, the usable differential signals on the FMC connector are reduced. In
16 Bit mode, the Cypress FX3 controller can access the USB 2.0 UART controller using its RS232
interface and four of its GPIO pins are routed to the FX3 connector (J801).