I don't know about DM6446, but on DM355 the limiting factor is DDR
memory bandwidth. I tried to capture two sync locked 8-bit BT.656
streams side-by-side as 16-bit input and use DMA to separate them for
display. It worked, but there was not enough DDR memory bandwidth to do
this and output the imag
Jon Povey wrote:
I don't know about DM6446, but on DM355 the limiting factor is DDR
memory bandwidth.
same for the 6441/6446, the limiting factor is DDR bandwidth, not CPU/DSP/DMA
speed.
I tried to capture two sync locked 8-bit BT.656
streams side-by-side as 16-bit input and use DMA to sepa
ddr2 theorical bandwidth = 297M * 4 * 32bit/8 = 4752MBytes/s
because of delay ,bandwidth = 4752*0.4 = 1900MBytes/s
4 channels D1(720x480) data = 720 * 480 * 2 * 30frames/s * 4 channels =
82944000Mbytes/s = 81MBytes
the data save to DDR2 and load to cpu to process,meanwhile,send to OSD to
displa
I am wrong,
the bandwidth = 166M*4*32bit/8 = 2656MBytes/s
huahua5
2008-08-01
发件人： huahua5
发送时间： 2008-07-31 10:22:38
收件人： Panchy Rivas; [EMAIL PROTECTED]
抄送：
主题： Re: 4 video capture and SMP-linux support
ddr2 theorical bandwidth = 297M * 4 * 32bit/8 = 4752MBytes/s
because of delay
