SH7205 Datasheet, PDF (1485/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 26 2D Graphics Engine (2DG)
Table 26.10 Examples of Determining Subject Lines (duplicate-lines)
Example 1:
Vertical enlargement ratio = 3/2
SV = 100, DV = 150, OFS = 0
Example 2:
Vertical enlargement ratio = 5/4
SV = 80, DV = 100, OFS = 0
Example 3:
Vertical enlargement ratio = 2/1
SV = 100, DV = 200, OFS = 0
Computational
Computational
Computational
SL
Result
SL
Result
SL
Result
0
1
0
1
0
1
1
2
1
2
1
2
2
2
2
1
2
2
3
1
3
1
3
2
4
2
4
2
4
2
5
1
5
1
5
2
6
2
6
1
6
2
:
:
:
:
:
:
:
:
78
2
:
:
:
:
79
1
:
:
:
:
:
99
1
99
2
Note: Since SL = 0 lines leads to exception handling, always set the transfer of a line at least
once regardless of the multiplier.
An example shows to judge whether or not duplicate-line settings are required in the following
case.
• Condition
Number of source pixels (SV): 100
Number of destination pixels (DV): 150
Fractional part of the result of calculating phase of vertical starting position (V1PHS_DCML):
H'500 = 1365
Line number (SL): 78
Rev. 1.00 Mar. 25, 2008 Page 1453 of 1868
REJ09B0372-0100