Hello-
I’m having trouble getting my PC to recognize/enumerate with the TUSB2077A in my design (with no downstream devices connected). The schematic is below.
From reading the forums, for each unused downstream port I’ve tied the pins together and pulled to ground via 15k resistor (not reflected in schematic below). That hasn’t solved the problem
I’ve been focusing on the reset circuit timing at power up. Below is a scope capture (yellow: 3.3V, blue: reset, pink: crystal). I'm assuming the problem might be that the crystal we are using takes a few millisecond to stabilize. The below scope capture is based on an RC filter of 80k and 0.1uF on the Reset line to hold it low longer so the clock was more stable before RESET going back HI. That hasn't solved the issue though. The crystal we are using is ABC2-6.000MHZ-4-T from Abracon. I thought I saw in some other forum posts that the ABC2 series was acceptable as a crystal for this IC. Is there another crystal that is recommended, as the one in the datasheet is obsolete.
Any help would be appreciated. I'm stumped. Thanks.
