STV3550B STMicroelectronics, STV3550B Datasheet - Page 44

• Manufacturer Part Number: STV3550B
• Manufacturer: STMicroelectronics

Specifications of STV3550B

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

Graphics functional description
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Note:
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An OSD region must be at the same position (same TV line) in both interlaced and
The Palettep[31:0] value is not the address of the first byte of the first color in the palette. It
is the address of the first byte of the first color loaded in the OSD CLUT.
The address of the first byte (first pixel) in the Top Field block which will be displayed in the
OSD region is defined in bits Topp[31:0].
The address of the first byte (first pixel) in the Bottom Field block which will be displayed in
the OSD region is defined in bits Bottomp[31:0].
Using pointers Topp[31:0] and Bottomp[31:0], the top field block and the bottom field block
can be the same (e.g. it can be used for Simple Character mode).
The address of the next OSD specification in the SDRAM is defined in bits OSDp[31:0]. If
the current OSD specification is the last one displayed on the TV screen, the Stop Linked
List (SLL) bit must be set.
OSD region positions
The top position of the current OSD region is specified in bits
vertical start of the OSD region on the screen. This value is given as a number of TV lines.
The top line specified in the first word of an OSD region specification must be greater than
or equal to 3.
The bottom position of the current OSD region is specified in bits
define the vertical end of the OSD region on the screen. This value is given as a number of
TV lines.
The left position of the current OSD region is specified in bits
horizontal start of the OSD region on the screen. This value is given as a number of pixel
clock periods.
The right position of the current OSD region is specified in bits
the horizontal end of the OSD region on the screen. This value is given as a number of pixel
clock periods.
progressive mode. In progressive or non-interlaced mode, the Y_top and Y_bottom
positions are programmed the same way. This means that the number of TV lines displayed
for an OSD region in progressive mode is never an odd number. An OSD region will always
have (Y_bottom -Y_top)*2 TV lines displayed.
In Interlaced mode, the same number of TV lines is displayed in both fields. Value
“Y_bottom - Y_top” is field-based.
OSD region characteristics
The total number of pixels to be displayed in the top or bottom field for the current OSD
region is given in bits TPND[21:0]. The number of pixels in the top field block is the same as
in the bottom field block. This is not the number of pixels programmed in the top and bottom
field blocks.
The pitch value which will be added to the Topp[31:0] or Bottomp[31:0] pointers in order to
load the next pixels is defined in bits Pitch[12:0]. This value represents the maximum
number of pixels which will be displayed in a TV line.
The number of pixels displayed in a single TV scan line is given in bits PNDL[11:0]. This
value is the same for all TV scan lines in a given OSD region.
X_left[11:0]
Y_top[10:0]
X_right[11:0]
Y_bottom[10:0]
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STV3550