LS1046A Boot Source

[tian_shuliang]

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？

[tian_shuliang]

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 .

[tian_shuliang]

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?

[ufedor]

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

[ufedor]

> 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.