2.7. Design Example Interface Signals
The Low Latency E-Tile 40G Ethernet testbench is self-contained and does not require you to drive any input signals.
Signal | Direction | Comments |
---|---|---|
clk50 | Input | This clock is driven by the board oscillator.
The hardware design example routes this clock to the input of an IOPLL on the device and configures the IOPLL to drive a 100 MHz clock internally. |
clk_ref | Input | Drive at 156.25 MHz. |
cpu_resetn | Input | Resets the IP core. Active low. Drives the global hard reset csr_reset_n to the IP core. |
tx_serial[3:0] | Output | Transceiver PHY output serial data. |
rx_serial[3:0] | Input | Transceiver PHY input serial data. |
user_led[7:0] | Output | Status signals. The hardware design example connects these bits to drive LEDs on the target board. Individual bits reflect the following signal values and clock behavior:
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