andres.calderon at emqbit.com
Sat Aug 22 08:34:54 EDT 2009
On Sat, Aug 22, 2009 at 7:15 AM, Wolfgang Spraul
<wolfgang at qi-hardware.com>wrote:
> The Ben NanoNote is using Jz4720 not Jz4725.
> What is the best way to have 64 MB SDRAM with the Jz4720?
> The 4720 has a 16-bit data bus whereas the 4740 has 32 bit, I think
> it's because 4720 has COB instead of BGA, but like you said some
> competitive reasons might be behind this too. Positioning the 4720
> as low-cost and against some other chips.
> I don't know anything about 4725 or 4725b right now.
Can you show us the price of the jz47xx family in volume?
We can benchmark the performance impact of the data bus width soon (Jz4725
> On Sat, Aug 22, 2009 at 02:06:19PM +0200, W.G. van de Hulst wrote:
> > I thought the point of the jz4725 was to be a jz4740-SX (16-bit
> > instead of 32-bit databus) to eliminate one RAM chip and to use LQFP
> > instead of BGA, both measures meant to lower cost and to compete with
> > comparable Rockchip 2706 designs.
> > It seems strange to add it back, but of course there's now the new
> > jz4725b that allows booting from SD, so you can sacrifice the flash
> > chip to avoid requiring more space.
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