Intel® Stratix® 10 TX Transceiver Signal Integrity Development Kit User Guide
ID
683591
Date
9/27/2019
Public
4.7.1. Transceiver Dedicated Clocks
Dedicated clocking scheme that is implemented on the Intel® Stratix® 10 TX transceiver signal integrity development board allows different protocols to run simultaneously by the Intel® Stratix® 10 TX FPGA.
Differential clock sources are provided from an I2C programmable oscillator or PLL to the dedicated REFCLK input pins of transceiver blocks on both sides of the FPGA. The default frequencies for the oscillator and PLL at startup are:
- 156.25 MHz (Y1 and U3)
- 322.265625 MHz (U3)
- 176.5625 MHz (U3)
- 307.2 MHz (U3)
The default frequencies can be overridden and a different frequency can be programmed into the oscillators and PLLs for support of other protocols.
Note: Programmed frequencies are lost upon a board power down. Oscillator and PLL frequencies return to their default frequency upon power up.
The oscillator or PLL provides a differential LVDS trigger output to SMA connectors for scope or other laboratory equipment triggering purposes.
In addition to the two oscillators and PLLs, each transceiver tile have dedicated differential REFCLK input from a pair of SMA connectors to allow use of laboratory equipment clock generators as the transceiver clock source.
The six inputs below connect directly to the transceiver clock inputs:
- J34/J35 SMA connector direct connection to H-tile block
- J36/J37 SMA connector direct connection to E-tile 8B block
- J38/J39 SMA connector direct connection to E-tile 8C block
- J40/J41 SMA connector direct connection to E-tile 9A block
- J42/J43 SMA connector direct connection to E-tile 9B block
- J44/J45 SMA connector direct connection to E-tile 9C block
The figure below shows the dedicated transceiver clocks that are implemented on the Intel® Stratix® 10 TX FPGA development kit.
Figure 7. Transceiver Clocks