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Alexander Chemeris alexander.chemeris at gmail.comAndrey, On Sun, May 20, 2012 at 6:46 PM, Andrey Sviyazov <andreysviyaz at gmail.com> wrote: > 1) Is it used somewhere? In the datasheet there is probable errors, for > example, 1PPS is specified as input. Use this datasheet, here it's marked as output: http://www.transystem.com.tw/product/66/EB-570%20Data%20Sheet%20V1.4.pdf Probably you have an older version of the datasheet. > 2) There are inputs Reset and Standby. The first can be left open, and the > second is possible need to be connected to to FPGA. Yes. > 3) There Is RTC_CLK_O we don't need him? And that there may be, 32768? Could you route it to a test-point or a 2-pin IDC? I don't think we need this, but it's better to have an ability to access it. > 4) Which of two UART's better to use or are they equivalent? There are no > any words in datasheet about it. Use TX0/RX0 (pins 13/14), which is default to NMEA - see the datasheet above. > 5) Unfortunately no place for both on PCB and we can use either EB-230 or > EB-570. Then we have to use EB-570. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru