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

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

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

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"