Hi.
For initial bring-up of our B4860 we have selected the hard-coded RCW (cfg_rcw_src[0:8]=0b0_1000_0110).
Using a USB TAP we can get to a point where DCFG_CCSR_BRR = 0x00000001 (release core 0 for boot) but core 0 is in a doze state. How do we avoid this or recover from it?
We don't see the same behaviour with a B4860QDS with hard-coded RCW.
Our SYSCLK = 66.667MHz and DDRn_CLKs = 133.333 MHz.
In case it's related, we also see another difference between our system and B4860QDS: When looking at registers with USB TAP, reading I2C registers seems to crash something and registers become unreadable, needing a restart to recover.
I'm a B4860 rookie, so any help with where to start looking for the cause would be appreciated.
Thanks.
Solved! Go to Solution.
1) Please refer to the B4860 Data Sheet Table 1. Pinout list by bus, Note 8 and confirm (after checking with a digital scope) that all relevant signals are not low during POR.
2) Please provide the schematics for inspection as searchable PDF.
It will be more convenient to create a Technical Case:
1) Please refer to the B4860 Data Sheet Table 1. Pinout list by bus, Note 8 and confirm (after checking with a digital scope) that all relevant signals are not low during POR.
2) Please provide the schematics for inspection as searchable PDF.
It will be more convenient to create a Technical Case:
Which exactly pin caused the issue?