ADV8003 Hardware Manual
Rev. B, August 2013
161
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Scaler: scales video to target resolution
•
Output port: generates output timing and output video
Register update protection is provided in the ADV8003. Refer to
3.4 for more details regarding how to update the various VSP
registers.
pvsp_lock_vom
, Primary VSP Map,
Address 0xE828[3]
This bit is used to lock the Video Output Module (VOM). If the Primary VSP is running and this bit is set to 1, the VOM will be locked
to a current register setting to display the last frame. The Primary VSP registers can be configured safely in this state. All new register
settings will be updated after this bit is set back to 0.
Function
pvsp_lock_vom
Description
0
Unlock VOM
1
Lock VOM
Note:
This register should be used only as part of the gentle reboot protocol. Refer to Section
3.4.3 for more details.
pvsp_update_vom
, Primary VSP Map,
Address 0xE828[4]
This bit is used to control the updating of the VOM. Registers in the VOM can be updated only when pvsp_update_vom is asserted. To
modify registers in the VOM, pvsp_update_vom should be de-asserted. The registers can then be modified. pvsp_update_vom should
then be asserted to let the VOM use the updated register value in the next frame. This procedure will guarantee the correctness of the
VOM configuration.
Function
pvsp_update_vom
Description
0
Do not update VOM
1
Update VOM
Note:
3.4 for more details on configuring the PVSP registers.
3.2.3.1.
Pixel Unpacker
The pixel unpacker in the VOM is very similar to that in the VIM. It is used to convert external memory words into video pixel (YCbCr)
data. Pixels in external memory have the following four different data formats (the same as those set by the VIM). The VOM pixel
unpacker is configured in the same way as the VIM pixel unpacker.
•
12-bit 4:4:4 YCbCr
•
10-bit 4:4:4 YCbCr
•
12-bit 4:2:2 YCbCr
•
8-bit 4:2:2 YCbCr
Data format details are described in
3.2.3.2.
VOM Cropper
The VOM cropper is similar to the VIM cropper with the exception that it uses the VOM set protocol while the VIM cropper uses the
gentle reboot protocol (refer to Section
3.4). Using the VIM cropper can reduce the external memory bandwidth required for scaling in
cases where bandwidth is a concern. If not, the VOM cropper should be used. The following registers are used to configure the VOM
cropper:
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Summary of Contents for ADV8003
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