Micronas SDA 6000, User Manual

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SDA 6000
PRELIMINARY DATA SHEET
Version 2.1
Display Generator
10 - 41 Micronas
10.7.7 Contents of CLUT (CLR)
CLR instruction allows the contents of the CLUT1 and CLUT2 to be set.
CLR
10.7.8 Clipping Coordinates (CUR and CBR)
These GAIs are used to set clipping coordinates for memory transfers. The clipping
coordinates describe a rectangle area in the destination memory area. During a memory
transfer these ‘clipped’ memory areas are excluded from the transfer. The CUR
instruction is used to set the clipping start address. The CBR instruction is used to set
the width and height of the clipping area in amounts of pixels. A width of ‘0’ means that
no clipping is processed, a width of ‘1’ means the clipping area has the width of 1
pixel, …. A height of ‘0’ means, that no clipping is processed, a height of ‘1’ means the
clipping area has the height of 1 line, … . Next to the start address, height and width a
clipping offset must be given for clipping. For a rectangle clipping area the sum of this
clipping offset and the clipping width must be the same as the sum of the destination area
width and the destination offset. Otherwise the clipping area will be a parallelogram, not
a rectangle.
Within instruction TAR it is decided whether the clipping area is inverted or non inverted.
Thus the outside region of the defined rectangle can be used for clipping as well as the
inside region. Please also refer to
Chapter 10.5.2 .
Bit Function
CLUT_
ADDR
(8 … 0) CLUT address
Bits 7 … 0 are CLUT vectors of either CLUT1 or CLUT2. Bit 8 selects the
CLUT:
0:
CLUT1 (256
⌠
16 bit)
1: CLUT2 (256
⌠
14 bit)
CLUT_
CONTENT
(15 … 0) Contents to be written
to one of the look up tables addressed by the CLUT vector defined
above. For CLUT1 all the 16 bits are used, for CLUT2 only bits 13 … 0
are used.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CLUT_CONTENT(15..0)
0 - - CLUT_ADDR(8..0) 1 1 1 -