I have one 4470 processor board in hand.the ddr chip is B8164B3PF-1D-F .i want to double check ddr size and frequence.
this ddr Is 4G bit and max freq is 466Mhz ,is correct?
As per the OMAP4470 TRM, the maximum size for each DDR supported is 1 GB.
The two EMIFs allow:• Connection between the device and LPDDR2-SDRAM memories. Support two CSs per EMIFcontroller.• PHY is the DDR physical interface, which implements data-rate conversion in compliance withLPDDR2 JEDEC requirements.• Memory density up to 8 Gbits supported per CS. Total address space is limited to 2GB = 16 Gbits
Also, OMAP4470 supports dual 466MHz LPDDR2 memory type compatible with previous chip sets namely OMAP4430/OMAP4460.
Please refer to the TI Website for OMAP4470 TRM at the following link:
In your case, the OMAP4470 is using 512MB DDR (implies 4G Bit) at 466MHz of LPDDR2 memory type.
Thanks & Best Regards,
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In addition to the good information provided by Venkat, I wanted to point you to the DDR configuration which is done in the x-loader:
In these files, you can see the specific parameters, including size and speed, used for the 4470 SOMs on Blaze:
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thank for your great point out the config file.
one more question i have B8164B3PF-1D-F data sheet about this DDR and this DDR is 8G bit size.
why you only config this DDR to 4G bit .
There is 4Gb (512MB) on each EMIF, for a total of 8Gb (1GB). You can see in the code, in sdram_elpida.c and sdram.c:
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