Why does the F-Tile Serial Lite IV Toolkit fail to enable Internal Serial Loopback during Link Initialization?

Description

There is a problem with the F-Tile Serial Lite IV Toolkit. Internal serial loopback enablement is unsuccessful and outputs an incorrect register value when performing Link Initialization. It's because we internally changed to demo_jtag when checking the tx_pll_locked and rx_cdr_locked status during the system-reset proc, but didn't change it back to phy_jtag when completed. 

Resolution

To work around this problem, you need to follow the steps below:

1. Click "Assert system Reset"
2. Click "Deassert system Reset"
3. Go to GUI Configuration tab and set JTAG to phy_jtag_m.master
4. Click "Link Initialization"

This has been fixed in Quartus® Prime Pro 24.3.