GOWIN IPUG781-1.5.1E USB 2.0 SoftPHY IP User Guide

GOWIN IPUG781-1.5.1E USB 2.0 SoftPHY IP

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Disclaimer

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Revision History

10/12/2021

| ****

1.2E

| Chapter 2.3 “Using 5V Host Supply to Power USB Device Solution” added.

12/23/2021

| ****

1.3E

| l  The configuration method of peripheral circuit modified.

l  IO configuration constraints added.

03/29/2022| 1.4E| The description of resource utilization added.

06/20/2022

| ****

1.5E

| l  The speed grade modified.

l  The description of pin constraints updated.

07/20/2022| 1.5.1E| A note added in Table 2-1.

Purpose

The purpose of Gowin USB 2.0 SoftPHY IP User Guide is to help you learn the features and usage of this IP by providing descriptions of functions, signals, and interface configuration.

Related Documents

The latest user guides are available on the GOWINSEMI Website. You can find the related documents at: www.gowinsemi.com.

•  DS100, GW1N series of FPGA Products Data Sheet
•  DS117, GW1NR series of FPGA Products Data Sheet
•  DS821, GW1NS series of FPGA Products Data Sheet
•  DS871, GW1NSE series of FPGA Products Data Sheet
•  DS861, GW1NSR series of FPGA Products Data Sheet
• DS891, GW1NRF series of FPGA Products Data Sheet
•  DS881, GW1NSER series of Bluetooth FPGA Products Data Sheet
•  DS102, GW2A series of FPGA Products Data Sheet
•  DS226, GW2AR series of FPGA Products Data Sheet
•  DS961, GW2ANR series of FPGA Products Data Sheet
•  DS976, GW2AN-55 Data Sheet
•  DS971, GW2AN-18X & 9X Data Sheet
•  SUG100, Gowin Software User Guide

Terminology and Abbreviations

The terminology and abbreviations used in this manual are as shown in Table 1-1.

Support and Feedback
Gowin Semiconductor provides customers with comprehensive technical support. If you have any questions, comments, or suggestions, please feel free to contact us directly by the following ways.

• Website: www.gowinsemi.com E-mail: support@gowinsemi.com

Introduction

Gowin USB 2.0 SoftPHY IP is a USB physical layer transceiver that can support data reception and transmission at high speed (480Mbps), full speed (12Mbps), and low speed (1.5Mbps). Table 2-1 Gowin USB 2.0 SoftPHY IP Overview

Gowin USB 2.0 SoftPHY IP

IP Core Application

Supported Devices[1]

| l  Arora family

l  LittleBee family, excluding

GW1N-1/GW1N-1S/GW1NZ-1/GW1N-1P5

devices..

Logic Resource| Please refer to Table 2-3 and Table 2-4.
Delivered Doc.
Design Files| Verilog (encrypted)
Reference Design| Verilog
TestBench| Verilog
Test and Design Flow
Synthesis Software| GowinSynthesis
Application Software| Gowin Software (V1.9.8.05 and above)

Note!
[1] Only part number with speed grade C7 and above support USB 2.0 SoftPHY IP

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 unstuffed.
•  Supports NRZI encoder and decoder.
•  Supports UTMI interface.

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

Supply voltage

High-power Port

| ****

VBUS

| Note 2, Section

7.2.1

| ****

4.75

| ****

5.25

| ****

V

Low-power Port

| ****

VBUS

| Note 2, Section

7.2.1

| ****

4.40

| ****

5.25

| ****

V

Supply Current
High-power Hub Port (out)| ICCPRT| Section 7.2.1| 500| | mA
Low-power Hub Port (out)| ICCUPT| Section 7.2.1| 100| | mA
High-Power Function (in)| ICCHPF| Section 7.2.1| | 500| mA
Low-power Function (in)| ICCLPF| Section 7.2.1| | 100| mA
Unconfigured Function/Hub (in)| ****

ICCINIT

| ****

Section 7.2.1.4

| | ****

100

| ****

mA

Suspended High-power| ICCSH| Note 15, Section| | 2.5| mA
Device| | 7.2.3| | |
---|---|---|---|---|---
Suspended Low-power Device| ****

ICCSL

| ****

Section 7.2.3

| | ****

500

| ****

µA

Resource Utilization

Gowin USB 2.0 SoftPHY IP can be implemented by Verilog. Its resource utilization may vary when the design is employed in different devices, or at different densities, speeds, or grades. Taking Gowin GW1NSR-4 and GW2AR-18 series of FPGA products as an instance, the resource utilization is as shown in Table 2-3 and Table 2-4. Table 2-3 Resource Utilization (І)

GW1NSR-4

| ****

C7/I6

| LUT| 384| ****

–

REG| 1109
ALU| 13
BSRAM| 1
SSRAM| 0
IO| 7
Device| Speed Grade| Resource| Utilization| Notes
---|---|---|---|---

GW2AR-18

| ****

C7/I6

| LUT| 384| ****

–

REG| 1109
ALU| 13
BSRAM| 1
SSRAM| 4
IO| 7

Note!
GW2A series and GW1NSR-4 can choose the chip with speed grade C6/I5; for other part numbers, please choose the chip with speed grade C7/I6.

Functional Description

In the RX, after USB serial data goes through IDES8, NRZI decoder, bit unstuffer, shift Reg modules in turn, USB RX data is received, and then the data transmits to the upper module through UTMI interface. In the TX, after receiving the data transmitted by UTMI and then going through shift Reg, bit stuffer, NRZI encoder to generate the serial TX data stream, which then is sent to the USB interface via OSER8.Figure 3-1 USB 2.0 SoftPHY Block Diagram

USB 2.0 SoftPHY External Circuit Connection
USB 2.0 SoftPHY supports high speed mode (480Mbps) . When the USB 2.0 SoftPHY is used as a USB slave device, the external circuit connection is as follows. Figure 3-2 USB Slave Device Interface Implementation

1.  You can see the followings for the IO port attribute constraints of GW2A series of FPGA.
   •  usb_dxp_io: IO_TYPE= LVCMOS33D PULL_MODE= NONE DRIVE=4;
   •  usb_term_dn_o: IO_TYPE=LVCMOS33 PULL_MODE= NONE DRIVE=8;
   •  usb_term_dp_o: IO_TYPE=LVCMOS33 PULL_MODE=NONE DRIVE=8;
   •  usb_pullup_en_o: IO_TYPE=LVCMOS33 PULL_MODE=NONE DRIVE=8;
   •  usb_rxdn_i: IO_TYPE=LVDS25 PULL_MODE=NONE;
   •  usb_rxdp_i: IO_TYPE=LVDS25 PULL_MODE=NONE.
2.  You can see the followings for the IO port attribute constraints of GW1N series of FPGA.
   •  usb_dxp_io: IO_TYPE= LVCMOS33D PULL_MODE= NONE DRIVE=8;
   •  usb_term_dn_o: IO_TYPE=LVCMOS33 PULL_MODE= NONE DRIVE=16;
   •  usb_term_dp_o: IO_TYPE=LVCMOS33 PULL_MODE= NONE DRIVE=16;
   •  usb_pullup_en_o: IO_TYPE=LVCMOS33 PULL_MODE= NONE DRIVE=8;
   •  usb_rxdn_i: IO_TYPE=LVDS25 PULL_MODE=NONE;
   •  usb_rxdp_i: IO_TYPE=LVDS25 PULL_MODE=NONE.
3.  All signals related to the USB interface on the FPGA are recommended to be placed in one Bank, using adjacent assignment, and powering the I/O Bank at 3.3V
4.  It is required that the adjacent differential pair pins in the same Bank where the usb_dxp_io differential pair is located exist and are not used. Taking GW1NSR-4 as an example, Figure 3-3 shows the GW1NSR-4 Pinout. If the usb_dxp_io differential pair is located at G5, H5 (i.e. IOR11A/IOR11B) in the diagram, it will cause the project to report an error when implementing synthesis and placement with Gowin Software, as the adjacent differential pair pins IOR10A/IOR10B do not exist. If usb_dxp_io differential pair is located at G6/H6 (i.e. IOR13A/IOR13B), the project will synthesize and place successfully with Gowin Software, as the adjacent differential pair pins IOR12A/IOR12B exists.

Signal Description

A description of Gowin USB 2.0 SoftPHY IP signals is as shown in Table 4-1.

3

| ****

rst_i

| ****

I

| ****

1

| Asynchronous reset signal resets the state machine inside of PHY.
4| pll_locked_i| I| 1| pll lock signal generating fclk_i

5

| ****

utmi_data_out_i

| ****

I

| ****

8

| Data input, 8-bit parallel data transmit bus.

6

| ****

utmi_txvalid_i

| ****

I

| ****

1

| Transmit data valid indicator, active-high.

7

| ****

utmi_txready_o

| ****

O

| ****

1

| Transmit data ready signal, indicating that PHY can receive the data to be transmitted from the

controller end.

8

| ****

utmi_data_in_o

| ****

O

| ****

8

| Data output, 8-bit parallel data receive bus.

9

| ****

utmi_rxactive_o

| ****

O

| ****

1

| Rx data active, indicating that PHY detects the SYNC signal and then

starts receiving data.

10| utmi_rxvalid_o| O| 1| Rx data valid, active-high.

11

| ****

utmi_rxerror_o

| ****

O

| ****

1

| Receive data error, active high indicates receive error.
No.| Signal Name| I/O| Data Width| Description
---|---|---|---|---

12

| ****

utmi_linestate_o

| ****

O

| ****

2

| Line status of receive end: DM DP 2’b00：SE0

2’b01：”J”

2’b10：”K”

2’b11：SE1

13

| ****

utmi_opmode_i

| ****

I

| ****

2

| Operation mode selection signal: 2’b00: Normal

2’b01: No driver

2’b10: Disable bit stuffing and NRZI encoding

2’B11: Reserved

14

| ****

utmi_xcvrselect_i

| ****

I

| ****

2

| Transfer mode selection signal: 2’b00: HS Transfer

2’b01: FS Transfer

2’b10: LS Transfer 2’B11: Reserved

15

| ****

utmi_termselect_i

| ****

I

| ****

1

| Termination Selection:

1’ b0: HS termination enable

1’ b1: FS / LS termination enable

16| usb_dxp_io| I/O| 1| USB data signal Data+
17| usb_dxn_io| I/O| 1| USB data signal Data-
18| usb_rxdp_i| I| 1| USB data signal Data+ input
19| usb_rxdn_i| I| 1| USB data signal Data- input

20

| ****

usb_pullup_en_o

| ****

O

| ****

1

| 1.5K resistor pull-up control on USB data signal Data+

21

| ****

usb_term_dp_o

| ****

I/O

| ****

1

| Termination resistor control of USB data signal Data+

22

| ****

usb_term_dn_o

| ****

I/O

| ****

1

| Termination resistor control of USB data signal Data-

Interface Configuration

Selecting “Tools > IP Core Generator” in Gowin Software, you call and configure USB 2.0 SoftPHY.

1. Open IP Core Generator After creating the project, you can click the “Tools” tab in the upper left, select and open the IP Core Generator via the drop-down list, as shown in Figure 5-1. Figure 5-1 IP Core Generator
2. Open USB 2.0 SoftPHY IP Core Select “Soft IP Core > Interface and Interconnect > USB 2.0 IP”, as shown in Figure 5-2. Double-click to open the configuration interface.
3. USB 2.0 SoftPHY IP Core Configuration Interface Figure 5-3 shows the USB 2.0 SoftPHY IP core configuration interface. The ports diagram is on the left of the configuration interface. Options are on the right.

References

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