I am looking at the USB 1.1 core and the testbench. The testbench
instantiates two modules, usb_phy and usb1_core. The usb1_core
instantiates several modules, one of which is the usb_phy. Is this
duplication an oversight, or am I missing something?

Regards,
Dalton

Hi,

I have not looked at the core that you are referring to.
Still, my understanding is the phy in the core should be of the device dut
and the one in the testbench i suppose is of the USBhost (testbench).
Hope you are aware that there are PHYs at both ends of the usb cable.

I am not sure if that is what u r looking for?

Anyways,

Bye,

Regards,
Gayathri Seshadri

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Gayathri, Thank you very much! I was aware that there are PHYs at both ends and now I realize why there are two here. I am new to USB and seem to stumble over the easy things right now... Regards, Dalton ----- Original Message ----- From: gayathri seshadrigaysesh@h...> To: Date: Fri Oct 8 14:43:30 CEST 2004 Subject: [usb] Duplicate PHY in testbench?

hi dalton, That was a good question. As far as i know, the USB_PHY can be said as a saperate module that needs to be tested. It is such that, the USB block needs to be considered with core as one part and Usb Phy as other part (i.e like the Logical and Physical Parts). Now the TestBench needs to check both the modules by instatiating. so when the Core is tested the Phy is tested and saperately the Phy needs to be tested. Note: USB core has Phy module which is like a physical part helping the Logical Core part. Therefore the Testbench calls the USB_PHY. I am giving this answer not looking at the Opencores USB core, but rather in a generalised USB core implimentation. wishes Pranav Dalton Marris dmarris@charter.net> wrote: I am looking at the USB 1.1 core and the testbench. The testbench instantiates two modules, usb_phy and usb1_core. The usb1_core instantiates several modules, one of which is the usb_phy. Is this duplication an oversight, or am I missing something? Regards, Dalton _______________________________________________ http://www.opencores.org/mailman/listinfo/usb __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.opencores.org/forums/usb/attachments/20041008/d869c83c/attachment.htm