2 Introduction
2.2 Features
IPUG781-1.5.1E
4(12)
2.2
Features
The features of GowinUSB 2.0 SoftPHY IP include:
Supports HS (480 Mbps), FS (12 Mbps), and LS (1.5 Mbps).
Supports data serial and parallel conversion.
Supports bit stuffer and unstuffer.
Supports NRZI encoder and decoder.
Supports UTMI interface.
2.3
Using 5V Host Supply to Power USB Device Solution
Many solutions may to provide power to a USB device using the 5V
provided over the cable from the Host without providing a separate power
supply. To support cable powered USB device use cases, designers must
be careful to ensure the total PCB BOM of the device does not exceed the
current limitations of the USB Host as well as voltage drops over the cable.
The USB v2.0 specification, sections 7.1.2 and 7.3.2 provides
information on current and voltage drop requirements expected to be
supplied by a USB Host. If the total PCB BOM cannot meet the current and
minimum voltage requirements of the specified host, the board can be
powered with a separate power supply.
Table 2-2 DC Electrical Characteristics
Parameter
Symbol Condition
Min.
Max.
Unit
Supply voltage
High-power Port
V
BUS
Note 2, Section
7.2.1
4.75
5.25
V
Low-power Port
V
BUS
Note 2, Section
7.2.1
4.40
5.25
V
Supply Current
High-power Hub Port (out)
I
CCPRT
Section 7.2.1
500
mA
Low-power Hub Port (out)
I
CCUPT
Section 7.2.1
100
mA
High-Power Function (in)
I
CCHPF
Section 7.2.1
500
mA
Low-power Function (in)
I
CCLPF
Section 7.2.1
100
mA
Unconfigured
Function/Hub (in)
I
CCINIT
Section 7.2.1.4
100
mA
Suspended High-power
I
CCSH
Note 15, Section
2.5
mA
