I use ls1046a to design a board, but cannot get the signal of the dial switch(boot source) after powering up.I want to know where something might go wrong?
1.CFG_ENG_USE0 is set 0, use DIFF_SYSCLK (100MHZ,Peak value of waveform is 640mV)
2. I will check PORESET_B again.
3.All supply voltages are correct, and power sequence is the same with frwy-ls1046a-ac .
1.CPU BOOT Source is as the same with frwy-ls1046a-ac
2.I select sdcard to startup, then set CFG_RCW_SRC[0:8] : 0_0100_0000.When i test DIP-10 PIN 18,there is no signal(RCW can not be read). I test the same pin in frwy-ls1046a-ac,there is a high pulse.
I want to know what will affect Boot Source? eg: Power ? RTC_CLK? SYSCLK ? DIFF_SYSCLK? PORESET_B? or others?
It is required to check:
1) SYSCLK or DIFF_SYSCLK is applied and correctly selected by IFC_WE0_B strapping
2) PORESET_B is applied in accordance with the processor's Data Sheet requirements (Table 23. RESET Initialization timing specifications)
3) All supply voltages are correct
> cannot get the signal of the dial switch
What exactly does it mean?
Please provide detailed technical description of the issue including schematics as searchable PDF.