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BF547 and Mobile DDR Spec

Question asked by HaiN on Apr 11, 2011

Hi everyone,

 

According to the BF547 specification, the DSP supports mobile DDR memory with SCLK frequency from 120 MHz to 133 MHz (page 35).  I have some questions:

 

1. What is the issue if we run it slower than 120 MHz?

2. By default, the BF547 powers up with PLL Mult = 8 and SCLK Div = 4.  This yields a SCLK of 26 MHz with 13MHz input clock (my case).  Must I program the OTP for the DSP to even boot to the mobile DDR?

 

Thank you in advance!

Regards,

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