Part 3.3: Usb 2.0 Host Interface - Alinx ZYNQ7000 FPGA User Manual

Part 3.3: USB 2.0 Host Interface

There are 4 USB2.0 HOST interfaces on the AX7015 expansion board. The
USB2.0 transceiver uses a 1.8V, high-speed USB3320C-EZK chip that supports
the ULPI standard interface, and then expands the 4-port USB HOST interface
through a USB HUB chip USB2514. ZYNQ's USB bus interface is connected to the
USB3320C-EZK transceiver to achieve high-speed USB2.0 Host mode data
communication. The USB3320C's USB data and control signals are connected to
the IO port of the BANK501 on the PS side of the ZYNQ chip. The USB interface
differential signal (DP/DM) is connected to the USB2514 chip to extend the four
USB ports. Two 24MHz crystal oscillators provide system clocks for the USB3320C
and USB2514 chips, respectively.
4 USB HOST interfaces are provided on the expansion board. The USB
interface is a flat USB interface (USB Type A), which allows users to connect
different USB Slave peripherals (such as USB mouse and USB keyboard) at the
same time. In addition, the expansion board provides a +5V power supply for each
USB interface.
The schematic diagram of the ZYNQ processor, USB3320C-EZK chip and
USB2514 chip connection is shown as 3-3-1:
U1
ZYNQ
Figure 3-3-1: The connection between Zynq7000 and USB chip
Figure 3-3-2 shows the USB2.0 interface on the expansion board, where the
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ZYNQ FPGA Development Platform AX7015 User Manual
OTG_CLK
OTG_STP
BANK
OTG_NXT
501
OTG_DIR
OTG_DATA0~OTG_DATA7
OTG_RESET
BANK
500
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U7
USB PHY
DP/DM
(USB3320C)
U18
USB Hub
(USB2514)