saa6703h NXP Semiconductors, saa6703h Datasheet - Page 80

• Manufacturer Part Number: saa6703h
• Description: Xga Dual Input Flat Panel Controller.
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.17.4
There are 5 configurable signal generators available.
For operation with hsync, vsync and data enable three
generators are needed.
All CSGs have the same basic structure (see Fig.28).
There are two programmable action points: the start point
(a) and the end point (b). The start point describes the
upper left corner of the operation window. The end point
the lower right corner. When the row and line counter
values of the output interface are equal to the action point
values, the output becomes HIGH or LOW according to the
set-up. The possible actions for the start point are set or
toggle and for the end point reset or toggle. The output
signal can be inverted additionally.
Two modes are available: frame or line based. In frame
based mode the signal only changes in the upper, left and
the lower, right corner of each frame. In line based mode
the signal changes every line at the beginning and at the
end of the operation window. It is also possible to use just
one action point, e.g. to toggle the output each line or just
once in a frame. To disable an action point a logic 0 has to
be programmed to the y-value.
CSG0 and CSG1 are driven by two separate signal
generators (CSG0A or CSG0B and CSG1A or CSG1B
respectively) allowing a more complex signal to be
generated.
2004 Apr 01
handbook, full pagewidth
XGA dual input flat panel controller
C
last_line
ONFIGURABLE SIGNAL GENERATORS
1,1
main frame
a
operation window
Fig.28 Output frame set-up.
b
in line mode
the signal will
be repeated
in every line in the
operation window
80
The operation window upper left corner (a) is defined by
the OI_GxSX and OI_GxSY registers and the lower right
corner (b) is described by the OI_GxEX and OI_GxEY
registers (x out of 0 to 4). The action is defined by
programming the configuration register OI_GxC. The
corners (a and b) of the operation window are the action
points. In each action point the output signal is modified as
described in the configuration register. At the first action
point (a) the output will be set or toggled. At the second
action point the output signal will be reset or toggled again.
Example: In order to define a DE signal, the CSG window
is set to the active area. Bit frame or bit line of the
concerned CSG control register is set to line mode and the
CSG signal is set to logic 1 at point 1 and set to logic 0 at
point 2 (see Figs 29 and 30).
Important programming hint: The horizontal start values
(x-values) of the action points describe the offset from the
beginning of the line. If you want to start e.g. CSG0 at (2,3)
you have to program the values (1,3). If you want to stop
the signal after (12,14) you have to program the values
(12,14) so the signal changes its value at the end of
position 12 (edge to position 13). An offset of 0 is not
allowed. Avoid using the same column as wait column.
There are 3 groups of CSGs. The CSGs of each group
have some other additional features.
MHC235
blank_line_length
action point in frame and line mode
additional action points in line mode
Product specification
SAA6703H