Pixel Unpacker; Vom Cropper - Analog Devices ADV8003 Hardware Manual

•
Pixel unpacker: reads field/frame from external memory and unpacks memory word to video pixel information
• VOM cropper: reads cropped images from external memory
•
Output port: generates output timing and output video
Register update protection is provided in the ADV8003. Refer to
registers.
svsp_lock_vom, Secondary VSP Map, Address 0xE610[4]
This bit is used to lock the Video Output Module (VOM). If the Secondary VSP is running and this bit is set to 1, the VOM will be
locked to the current register setting to display the last frame. The Secondary 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
svsp_lock_vom
0 
1
Note: This register should be used only as part of the gentle reboot protocol. Refer to
svsp_update_vom, Secondary VSP Map, Address 0xE610[3]
Registers related to the VOM can be updated only when this bit is set to 0. All new register settings will be updated by VOM in next
frame after this bit is set back to 1.
Function
svsp_update_vom
0 
1

3.3.3.1. Pixel Unpacker

The pixel unpacker in the VOM of the SVSP is similar to that in the VOM of the PVSP. The pixel unpacker is used to convert external
memory words (128 bits) into video pixel (YCbCr-8-8-8-bit) data. Pixels in external memory can have the following two different data
formats which are the same as those set by the VIM. This is configured in the same way as the VIM.
• 24-bit YCbCr
• 16-bit YCbCr 4:2:2
Data format details are described in svsp_ex_mem_data_format[1:0].

3.3.3.2. VOM Cropper

The VOM cropper is also very similar to the cropper in the VOM of the PVSP. The following registers are used to configure the VOM
cropper.
• svsp_vom_crop_enable
• svsp_vom_crop_h_start[10:0]
• svsp_vom_crop_v_start[10:0]
• svsp_vom_crop_width[10:0]
•
svsp_vom_crop_height[10:0]
The function of the VOM cropper can be seen in
asserted.
Rev. B, August 2013
Description
Unlock VOM
Lock VOM
Description
Do not update VOM
Update VOM
Figure 65. To enable the cropper in the SVSP VOM,
Section 3.4 for more details regarding the update of the various VSP
Section
195
ADV8003 Hardware Manual
3.4.3 for more details.
svsp_vom_crop_enable should be