SDA9410
Preliminary Data Sheet
Application modes and memory concept
32 * (IPOSXM)/8
64
32
0
x/pixels
IPOSYM
0
1
2
3
4
block
y/lines
0
4
8
24 28 32
4 * (IPOSXM modulo 8)
Figure 31
Explanation of memory management I
The Figure 32 shows a picture (boat, number 1), which is located with the left upper
corner at the position (x1,y1). The picture will be compressed in vertical and horizontal
direction and stored at the position (x2,y2). The vertical and horizontal compression
mechanism of the input signal was explained before (compare "Vertical and horizontal
compression (VHCOMM/VHCOMS)" on page 32). This result could look like as
showed in the picture number 2b. Parts of the original boat are still visible. Therefore in
addition the I²C Bus parameters LEBORDM/LEBORDS, RIBORDM/RIBORDS,
UPBORDM/UPBORDS and LWBORDM/LWBORDS exist. These I²C Bus parameters
specify the amount of pixels at the left side and the right side and the amount of lines at
the top and the bottom which has to be written in addition into the memory with coloured
border values (I²C Bus parameters YBORDERM, YBORDERS, UBORDERM,
UBORDERS, VBORDERM, VBORDERS). Then the result could look like as showed in
the picture number 2a (white border colour). The amount of pixels at the left side can be
defined by the I²C Bus parameters LEBORDM/LEBORDS (amount of border pixels = 4
* LEBORDM/LEBORDS) and the amount of pixels at the right side can be defined by the
I²C Bus parameter RIBORDM/RIBORDS (amount of border pixels = 4 * RIBORDM/
RIBORDS). The maximum amount of pixels, which can be written in addition, is 28 pixels
on each side. The I²C Bus parameters UPBORDM/S and LWBORDM/S specify the
amount of lines which has to be written in addition into the memory at the upper and
lower edge of the picture with coloured border values. The maximum amount of lines,
which can be written in addition, is 15 on each side. But there is a limitation that the sum
of UPBORDM/UPBORDS + LWBORDM/LWBORDS should not exceed 20 (PAL) lines.
In horizontal direction as mentioned before only blocks (32 pixels) can be written into the
memory. That means for instance if the LEBORDM parameter has a value bigger as zero
and the 3 LSBs of IPOSXM parameter are zero (start position at a begin of a block), that
the complete block on the left side of the block specified by IPOSXM will be filled with
border colour.
72
Micronas
MICRONAS [ MICRONAS ]
