Article Details

ID: 2043
Case Type: faq
Category: Architecture
Related To: Configuration/Programming
Family: LatticeXP2

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Can the CSSPIN pin be used as a GPIO in dual-boot mode on the LatticeXP2 device?

When using the LatticeXP2 device in dual boot mode, the FPGA continuously drives the CSSPIN high.

The CSSPIN is considered a dual-purpose pin. However while the CFG0 pin = 0, controlling the dual-boot function, it will cause CSSPIN to be a dedicated configuration pin. CSSPIN will then drive high anytime it isn't trying to access the external SPI Flash device. Users desiring to use CSSPIN as a GPIO can make the CFG0 pin = 1 after configuration, this will return the CSSPIN pin to its default I/O behavior allowing GPIO use of the pin.