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mitydsp-L138F datasheet typo? MII_RXD or MII_DXD?

Added by Mike Costa about 11 years ago

Hi, I am confused with the terminology used in the mitydsp-l138f datasheet (july 12 2011)

Pins 79, 81, & 83 are labeled MII_*DXD*[1,2,3]. Is this a typo? should they be labeled MII_*RXD*[1,2,3]?

75 I/O MII_RXDV 76 I/O MII_TXD3
77 I/O MII_RXD0 78 I/O MII_TXD2
79 I/O MII_DXD1 80 I/O MII_TXD1
81 I/O MII_DXD2 82 I/O MII_TXD0
83 I/O MII_DXD3 84 I/O MII_TXEX

And if it is a typo is there any reason I could not use pins 81 and 83 for UART 0?

Thanks,
Mike


Replies (3)

RE: mitydsp-L138F datasheet typo? MII_RXD or MII_DXD? - Added by Michael Williamson about 11 years ago

Hi Mike,

You are correct, there is a typo in the datasheet. We'll update the sheet, thanks for pointing it out. In the meantime, the signals you are concerned about should be:

Pin Function Pin Function
75 I/O MII_RXDV 76 I/O MII_TXD3
77 I/O MII_RXD0 78 I/O MII_TXD2
79 I/O MII_RXD1 80 I/O MII_TXD1
81 I/O MII_RXD2 82 I/O MII_TXD0
83 I/O MII_RXD3 84 I/O MII_TXEX

If you do not require ethernet access, you could configure these pins for UART0. Please make sure you update your pinmux configuration to select the right functions for the pins in question. This will be needed in your low level setup file of whatever OS you are running.

-Mike

RE: mitydsp-L138F datasheet typo? MII_RXD or MII_DXD? - Added by Mike Costa about 11 years ago

Hi Mike, thanks for the verify, and pointing out that those pins are used for the Ethernet control. I do need ethernet (mainly for gdb debugging) so i will keep looking around for other options.

RE: mitydsp-L138F datasheet typo? MII_RXD or MII_DXD? - Added by Michael Williamson about 11 years ago

If you are not using all the UPP pins, you might be able to use RMII (routed through the FPGA) to free up these pins. Also we do have an FPGA UART core that could be used for UART I/O.

-Mike

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