>> On the other hand these codecs seem to be jz4750+ only, because they >> make use of some acceleration hardware not present on jz4740 at all... >> > > > The NN use the Jz4720, see de DataSheet (Sec. 1.2.1 CPU core, pag 8): > http://www.amebasystems.com/downloads/hardware/datasheets/ben-nanonote/Ingenic-SOC-JZ4720/SOC-U1-Jz4720_ds.pdf > > The Jz4720 have Xburst SIMD instruction set to support multimedia > acceleration. > > Sadly, those instructions are not documented but the mplayer modified by > Ingenic works very well (thanks to HW SIMD acceleration). >
No, basic MXU set is documented pretty well in both written english and equivalent C code. Look at Dingoo site for former and libjpeg sources for later. The hardware acceleration I was talking about is not SIMD extenstion set, but graphical hardware in the form of SoC peripheral. jz4740 has none, but it appears that jz4755+ have at least IDCT and motion compensation in silicon. Check the block diagram at http://www.ingenic.cn/eng/productServ/AppPro/JZ4755/pfCustomPage.aspx Regards, Sergey _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
