L64105 LSI Logic Corporation, L64105 Datasheet - Page 328

• Manufacturer Part Number: L64105
• Description: Mpeg-2 Audio/video Decoder
• Manufacturer: LSI Logic Corporation

9.11 Display Freeze
9-36
The host can write to the Freeze Mode bits of Register 275
to select one of the three freeze modes listed in
Table 9.10
When the host issues a freeze, the display freezes in the requested
mode and picture reconstruction is halted to prevent overwriting the
stored image. When the host removes the freeze condition, the Display
Controller displays one more field of the current frame and picture
reconstruction is resumed.
Figure 9.18
a Freeze Frame request, the Display Controller repeats both the first and
last field of the frame store. After the freeze is removed, the Display
Controller displays one more field to restart the reconstruction process.
This freeze mode is recommended only for frame-based pictures since
there is no motion between the fields.
When executing a Freeze Last Field, the Display Controller displays the
first field of the frame store once and then freezes on the last field of the
frame store. After the freeze condition is removed, the Display Controller
displays the last field one more time to restart the reconstruction
process. It then displays the first field of the next frame.
During Freeze First Field and Hold, the Display Controller only displays
the first field of the frame store. After the freeze is removed, the Display
Controller displays the first field once more to restart the reconstruction
process. It then displays the first field of the next frame.
Video Interface
Freeze Mode Bits Freeze Mode
0b00
0b01
0b10
0b11
shows the timing of the freeze modes. When the host issues
Freeze Modes
Normal (no freeze)
Freeze Frame
Freeze Last Field
Freeze First Field and Hold
Table
9.10.
(page
4-62)