188.8.131.52. Active Serial Single-Device Configuration
For single-device AS configurations, connect the Intel® Cyclone® 10 LP device to a serial configuration device.
The Intel® Cyclone® 10 LP device uses the DCLK and DATA pins to send operation commands and read address signals to the serial configuration device. The configuration device provides data on its DATA pin, which connects to the DATA input of the Intel® Cyclone® 10 LP device. All AS configuration pins (DATA, DCLK, nCSO, and DATA) have weak internal pull-up resistors that are always active. After configuration, these pins are set as input tri-stated and driven high by the weak internal pull-up resistors.
Intel® Cyclone® 10 LP generate the serial clock, DCLK, that provides timing to the serial interface. In the AS configuration scheme, Intel® Cyclone® 10 LP devices drive control signals on the falling edge of DCLK and latch the configuration data on the following falling edge of this clock pin.
The recommended DCLK frequency supported by the AS configuration scheme is 40 MHz. You can source DCLK using the internal oscillator. The internal oscillator ensures that its maximum frequency is guaranteed to meet serial configuration device specifications. Intel® Cyclone® 10 LP devices offer the option to select CLKUSR as the external clock source for DCLK. You can change the clock source option in the Intel® Quartus® Prime software in the Configuration tab of the Device and Pin Options dialog box.
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