What is the max, operationg frequency for DDR2 (max.clock frequ=250MHz) ???
And what max.frequ. for the RAM is relevant ->as i understand DDR2 ram (dual data rate) , is it possible
to use DDR2speeds up to 500MHz ??
Please refer to Table 17. Clock Operating Conditions of the BF60x datasheet (http://www.analog.com/static/imported-files/data_sheets/ADSP-BF606_607_608_609.pdf ). As indicated in Table 1, 250MHz is the maximum supported DDR2 frequency (fDCLK). Thus, maximum achievable throughput is 1 GByte/sec = 250MHz x 16-bits wide port x 2 (dual data rate) / 8 (Byte).
I hope this helps.
Hi - thanks for Information. As i understand this, we can use a DDR2 Ram with
a Speed grad of 500MHz because the double data rate is given in their datasheets.
e.g. the Winbond W9751G6KB-3 is DDR2-667 speedgrade tck=3ns=333MHz
The DMC of the ADSP-BF60x runs at tck=4ns with 250MHz clock speed. This is in the range of 3ns...8ns of the Winbon device you picked. Even 125MHz clock speed on the DDR2 interface would work (tck=8ns).
If you need help calculating the right timings, here is a spread sheet that can support you: BfSdcDmcCalculation_Release.xlsx
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