Reference Boards/ip7500iap
From Ubicom Developer
The Ubicom Internet Audio Player Reference Design provides a reference hardware and software solution enabling the quickest time to market for internet radio and networked audio products. Thousands of radio stations and music services are accessible through the reference design user interface. For quick time-to-market products, Ubicom provides a protocol compliant, tested platform suitable for immediate industrial design and product testing. For those looking to add additional functionality, the reference solution provides a stable base design from which additional features can be added using Ubicom's Linux distribution as well as other open-source code bases.
Known board issues:
Rev 1.0
- Port B SDIO does not work on this board. The appropriate DIP SW4[1:0] must be set to ON,OFF in order to use SDIO on Port F.
- Switches U13 & U14 are incorrectly routed. This is fixed in Rev 1.1.
- The touch controller can get into an unknown state if the IAP is powered down with the Ubicom Programming Dongle connected to the board. There are two workarounds:
- Power down the board, remove the dongle header, wait 10 seconds for the capacitors to discharge. Power on the board, then plug in the dongle header.
- Create an extender for J2 and remove pin 6 (PE0). This will prevent leakage current back into the IAP.
- SDA and SCL for I2C to the Audio DAC is reversed. This is fixed in Rev 1.1.
- R154 and R156 need stronger (2.2k) pull-ups for the I2C bus. This is fixed in Rev 1.1.
- Pin 38 of the Ethernet PHY is not being driven and should be pulled down. This is fixed in Rev 1.1.
- DAT0 of J13 (SDIO_D0) needs to a pull-up.
Rev 1.1
- Clock to Ethernet PHY needs to be delayed to meeting timing margins.
- The touch controller can get into an unknown state if the IAP is powered down with the Ubicom Programming Dongle connected to the board. There are two workarounds:
- Power down the board, remove the dongle header, wait 10 seconds for the capacitors to discharge. Power on the board, then plug in the dongle header.
- Create an extender for J2 and remove pin 6 (PE0). This will prevent leakage current back into the IAP.
- DAT0 of J13 (SDIO_D0) needs to a pull-up.
