Allwinner A20 - USB Host Special Requirement

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 696 / 812
6.8.8. USB Host Special Requirement
6.8.8.1. USB HOST CLOCK REQUIRMENT
Name
Description
HCLK
System clock (provided by AHB bus clock). This clock needs to be >30MHz.
CLK60M
Clock from PHY for HS SIE, is constant to be 60MHz.