はてなブックマーク

HSI and HSO (in and out) are from the perspective of the host controller. Where host HSO/TX will connect to device RX and host HSI/RX to device TX. Man, this is really confusing with TX, RX, device, host, passing through USB, which side is which... 😕 There’s also a small hole near the centre, this allows any leftover solder from the large ground pad to have somewhere to go when placing the chip,