ADV601LCJST Analog Devices Inc, ADV601LCJST Datasheet - Page 13

• Manufacturer Part Number: ADV601LCJST
• Description: IC CODEC VIDEO DSP/SRL 120LQFP
• Manufacturer: Analog Devices Inc
• Type: Video Codecr

Specifications of ADV601LCJST

• Rohs Status: RoHS non-compliant
• Data Interface: DSP, Serial
• Resolution (bits): 8 b
• Sigma Delta: No
• Voltage - Supply, Analog: 4.5 V ~ 5.5 V
• Voltage - Supply, Digital: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 120-LQFP

Some comments on how these registers work are as follows:
• The vertical numbers include the blanking areas of the video.
• The default cropping mode is set for the entire frame. Specifi-
VIDEO AREA REGISTERS
The area defined by the HSTART, HEND, VSTART and VEND registers is the active area that the wavelet kernel processes. Video
data outside the active video area is set to minimum luminance and zero chrominance (black) by the ADV601LC. These registers
allow cropping of the input video during compression (encode only), but do not change the image size. Figure 10 shows how the
video area registers work together.
HSTART Register
Indirect (Write Only) Register Index 0x02
This register holds the setting for the horizontal start of the ADV601LC’s active video area. The value in this register is usually set to
zero, but in cases where you wish to crop incoming video it is possible to do so by changing HST.
[9:0]
[15:10] Reserved (always write zero)
HEND Register
Indirect (Write Only) Register Index 0x03
This register holds the setting for the horizontal end of the ADV601LC’s active video area. If the value is larger than the max size of
the selected video mode, the ADV601LC uses the max size of the selected mode for HEND.
[9:0]
[15:10] Reserved (always write zero)
VSTART Register
Indirect (Write Only) Register Index 0x04
This register holds the setting for the vertical start of the ADV601LC’s active video area. The value in this register is usually set to
zero unless you want to crop the active video.
To vertically crop video while encoding, program the VSTART and VEND registers with actual video line numbers, which differ for
each field. The VSTART and VEND contents must be updated on each field. Perform this updating as part of the field-by-field BW regis-
ter update process. To perform this dynamic update correctly, the update software must keep track of which field is being processed next.
[9:0]
[15:10] Reserved (always write zero)
VEND Register
Indirect (Write Only) Register Index 0x05
This register holds the setting for the vertical end of the ADV601LC’s active video area. If the value is larger than the max size of the
selected video mode, the ADV601LC uses the max size of the selected mode for VEND.
To vertically crop video while encoding, program the VSTART and VEND registers with actual video line numbers, which differ for each
field. The VSTART and VEND contents must be updated on each field. Perform this updating as part of the field-by-field BW register
update process. To perform this dynamic update correctly, the update software must keep track of which field is being processed next.
[9:0]
[15:10] Reserved (always write zero)
REV. 0
Specifically, a VSTART value of 21 will include the first line
of active video, and the first pixel in a line corresponds to a
value HSTART of 0 (for NTSC regular).
Note that the vertical coordinates start with 1, whereas the
horizontal coordinates start with 0.
cally, Field 2 starts at a VSTART value of 283 (for NTSC
regular).
Horizontal Start, HST[9:0]. 10-bit value defining the start of the active video region. (0 at reset)
Horizontal End, HEN[9:0].10-bit value defining the end of the active video region. (0x3FF at reset this value is larger than
the max size of the largest video mode)
Vertical Start, VST[9:0]. 10-bit value defining the starting line of the active video region, with line numbers from 1-to-625
in PAL and 1-to-525 in NTSC. (0 at reset)
Vertical End, VEN[9:0]. 10-bit value defining the ending line of the active video region, with line numbers from 1-to-625
in PAL and 1-to-525 in NTSC. (0x3FF at reset—this value is larger than the max size of the largest video mode)
–13–
VSTART
VEND
Figure 10. Video Area and Video Area Registers
0, 0
ZERO
ZERO
ZERO
HSTART
ACTIVE VIDEO AREA
ZERO
ZERO
MAX FOR SELECTED VIDEO MODE
ADV601LC
HEND
ZERO
ZERO
ZERO
X, Y