Activity
From 10/11/2014 to 11/09/2014
10/28/2014
- JC 11:48 AM PCB Development: RE: RTC Crystal Specifications
- Theres a 24MHz crystal between XTALOUT and XTALIN on the ARM. Its frequency tolerance at 25C is +/- 25ppm.
Note these numbers are based on a 3359-GX-226-RL RevD. - CL 11:42 AM PCB Development: RE: RTC Crystal Specifications
- Great, thank you for the information. Is it a similar specification for the other oscillator on the board, connected to the ARM?
- JC 11:31 AM PCB Development: RE: RTC Crystal Specifications
- For the 32khz crystal attached between the OSC32KOUT and OSC32KIN pins, according to its datasheet, the frequency tolerance at 25C is +-10ppm.
- What are the ppm drift specifications for the TPS65910 RTC crystal?
10/27/2014
- AB 04:10 PM Software Development: RE: Communicating with an 8-bit parallel interface (GPIO, SPI or GPMC)
- Updated question(s) from the customer:
I've been looking into using GPMC. The Technical Reference Manual for the AM335x says that GPMC has a 512MB address space. Since the module I have has a 512MB NAND flash on GPMC, configuring anot...
10/21/2014
- JC 10:28 AM Software Development: RE: Communicating with an 8-bit parallel interface (GPIO, SPI or GPMC)
- SPI:
I'm not sure what you mean by using the spi bus to handle the 8-bit data bus.
If you want raw access to the spi device then you need to modify the baseboard file. The 3.2 kernel we are using doesn't use device tree, instead the... - JC 10:16 AM Software Development: RE: Communicating with an 8-bit parallel interface (GPIO, SPI or GPMC)
- As Alex mentioned the GPMC bus is used for an on-SOM nand memory. The GPMC bus allows multiple devices to use the bus as long as they only communicate when their chip select is high. Does your device have someway to ignore communicatio...
10/20/2014
- Posting this on behalf of a customer:
The interface to their networking chip and other peripheral boards on their current motherboard is through memory mapped I/O. The customer would like to recreate this with the MitySOM-335x and is ...