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USB speed is capped to Full Speed when using a custom UTMI PHY #276

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jeanthom opened this issue Sep 11, 2024 · 0 comments · May be fixed by #277
Open

USB speed is capped to Full Speed when using a custom UTMI PHY #276

jeanthom opened this issue Sep 11, 2024 · 0 comments · May be fixed by #277
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@jeanthom
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Hi,

I recently noticed that when using Luna with a custom UTMI PHY, it would limit itself to USB FS. The limit is a hardcoded value:

luna/luna/gateware/usb/usb2/device.py

Lines 118 to 123 in 6a8d1e5

else:
self.utmi = bus
self.bus_busy = Const(0)
self.translator = None
self.always_fs = True
self.data_clock = 12e6

There is no technical limitation preventing us from doing USB HS: we tested a modification of these constants successfully with a ULPI-UTMI translator.

Jean
jeanthom added a commit to lambdaconcept/luna that referenced this issue Sep 11, 2024
@jeanthom
gateware.usb.usb2.device: Enable HS transfer with custom UTMI
24e3a0a 
Removes Full Speed limitation when using custom UTMI PHY. Bump the
associated to 60 MHz (required for achieving 480Mbps throughput).

Fixes greatscottgadgets#276
@jeanthom jeanthom linked a pull request Sep 11, 2024 that will close this issue
Open
jeanthom added a commit to lambdaconcept/luna that referenced this issue Sep 11, 2024
@jeanthom
gateware.usb.usb2.device: Enable HS transfer with custom UTMI
428b796 
Removes Full Speed limitation when using custom UTMI PHY. Bump the
associated clock to 60 MHz (required for achieving 480Mbps throughput).

Fixes greatscottgadgets#276
povauboin pushed a commit to lambdaconcept/luna that referenced this issue Sep 26, 2024
@jeanthom @povauboin
gateware.usb.usb2.device: Enable HS transfer with custom UTMI
72e3b32 
Removes Full Speed limitation when using custom UTMI PHY. Bump the
associated clock to 60 MHz (required for achieving 480Mbps throughput).

Fixes greatscottgadgets#276
@martinling martinling added the bug label Oct 17, 2024
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gateware.usb.usb2.device: Enable HS transfer with custom UTMI lambdaconcept/luna
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@martinling @jeanthom