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R61509V Target Spec
Rev. 0.11 April 25, 2008, page 114 of 181
RAM
write
Display
operation
0
16.67
(60 Hz)
Back porch
(14 lines)
Main panel
Moving picture
display
(432 lines)
Front porch (2 lines)
Blank period
RC oscillation
±7%
Display
operation
VSYNCX
[line]
432
VSYNCX
BP = 14H
RAM write
7.4 MHz
FP = 2H
[ms]
Line processing
Figure 35 Write/Display Operation Timing via VSYNC Interface
Notes to VSYNC Interface Operation
1. The above example of calculation gives a theoretical value. Possible causes of variances of internal
oscillator should be taken into consideration. Make enough margins in setting RAM write speed for
VSYNC interface operation.
2. The above example shows the values when writing over the full screen. Extra margin will be created if
the moving picture display area is smaller than that.
0
16.67
(60 Hz)
Display
operation
16
Back porch (14 lines)
Base image
Moving picture
display
(360 lines)
Front porch (2 lines)
(16 lines)
(56 lines)
RAM
write
[line]
[ms]
432
376
BP = 14H
VS
YN
C
VSYNCX
FP = 2H
RC oscillation
±7%
Display
operation
RAM write
7.4MHz
Line processing
Figure 36 RAM Write Speed Margins