用Malogic FPGA Board 上的Cy7c68000实现了USB to UART（全速）

dodoee

       这几天用Malogic FPGA Board上的 cy7c68000 高速/全速 PHY 实现 了USB to UART（全速），电路和芯片是正常的。有空了，还要实现 U Disk 枚举，出这个USB Core 的视频课，包括USB 协议。想要学USB 芯片设计的，可以去我的店里看看 Malogic FPGA Board。

我用的USB Core 的链接 及介绍：
### USB CDC Device

Github:   [http://github.com/ultraembedded/core_usb_cdc]
(https://github.com/ultraembedded/core_usb_cdc)

This component is a simple USB Peripheral Interface (Device) implementation which
enumerates as either a high-speed (480Mbit/s) or full-speed (12Mbit/s) CDC-ACM device.

This IP has a simple fifo interface (valid, data, accept) for input and output data,
and an UTMI interface for connection to a USB PHY.

##### Features
* High or Full speed USB CDC device.
* Enumeration in hardware - no SW intervention required.
* UTMI PHY interface (see my UTMI to ULPI Conversion wrapper project to allow
connection to a ULPI PHY e.g. USB3300)
* Simple 8-bit data input / output interface with handshaking
(compliant with a 8-bit wide AXI4-Stream interface).

##### Configuration / Requirements (Full Speed (12Mbit/s))
* Top: usb_cdc_core
* Clock: clk_i - 48MHz or 60MHz
* Reset: rst_i - Asynchronous, active high
* VID/PID can be changed in usb_desc_rom.v
* Param: USB_SPEED_HS = "False"

##### Configuration / Requirements (High Speed (480Mbit/s))
* Top: usb_cdc_core
* Clock: clk_i - 60MHz
* Reset: rst_i - Asynchronous, active high
* VID/PID can be changed in usb_desc_rom.v
* Param: USB_SPEED_HS = "True"

##### Limitations
* Really basic USB-CDC class device implementation, will ignore encap,
line state and line coding change requests!
* USB suspend/resume will not work correctly.

##### Testing
Verified under simulation then tested on FPGA against Linux, Windows and MAC OS-X.

##### References
* [USB 2.0 Specification](https://usb.org/developers/docs/usb20_docs)
* [UTMI Specification](https://www.intel.com/content/da ... e-specification.pdf)
* [ULPI Specification](https://www.sparkfun.com/datasheets/Components/SMD/ULPI_v1_1.pdf)
* [USB Made Simple](http://www.usbmadesimple.co.uk/)
* [UTMI to ULPI Conversion](https://github.com/ultraembedded/cores/tree/master/ulpi_wrapper)
* [USB Full Speed PHY](https://github.com/ultraembedded/core_usb_fs_phy)

dodoee

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