Driving IFCLK on the CY7C68013 | Cypress Semiconductor
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Driving IFCLK on the CY7C68013
Does IFCLK need to be driven continuously, or only when the SLxx pin is set LOW?
If the FX2 is configured to use an external clock source, the IFCLK pin can be driven at any frequency between 5 MHz and 48 MHz. For proper operation, however, IFCLK must be continuously driven while the FX2 is functioning.
Before switching to external IFCLK please make sure that the IFCLK at the pin from external source is stable, otherwise the FIFO Flags will get stuck.