Digital Signal Processing Reference
In-Depth Information
Table 20.1
Calculating the memory bandwidth for the deinterlacer
and the framebuffer
Worst Case Input
Format
Worst Case Output
Format
Worst Case Motion
Format
Function
Deinterlacer
(1080i60)
1920
1080
21.3 bits
60 / 2 fps
(1080p60)
1920
1080
21.3 bits
60 fps
(1 motion value per sample)
1920
1080
10.24 bits
60 / 2 fps
1.327 GBit/s
2.654 GBit/s
0.637 Gbit/s
Frame buffer
(1080p60)
1920
1080
21.3 bits
60 fps
(1080p60)
1920
1080
21.3 bits
60 fps
N/A
2.654 Gbit/s
2.654 GBit/s
Function
Memory Access
Bandwidth (GBit/s)
Deinterlacer
One read at input rate
One read at motion rate
One write at motion rate
Two accesses at output rate
1
1.327
¼
1.327
1
0.637
¼
0.637
1
0.637
¼
0.637
2
2.654
¼
5.308
Total bandwidth
7.909
Frame buffer
One write at input rate
One read at output rate
1
2.654
¼
2.654
1
2.654
¼
2.654
Total bandwidth
5.308
Table 20.2
The total worst-case system memory bandwidth
requirement
Function
Bandwidth (Gbit/s)
2
deinterlacer
2
7.909
¼
15.818
2
frame buffer
2
5.308
¼
10.616
Total
26.434
