Renesas R61509V - Manual (Page 116)

R61509V Target Spec
Rev. 0.11 April 25, 2008, page 116 of 181
FMARK Interface
In the FMARK interface operation, data is written to internal RAM via system interface synchronizing with
the frame mark signal (FMARK), realizing tearing less video image while using conventional system
interface. FMARK output position is set in units of line using FMP bit. Set the bit considering data transfer
speed.
RS
WRX
16
R61509V
FMARK
CSX
DB17-10, 8-1
HOST
PROCESSOR
Figure 38 FMARK Interface
In this operation, moving picture display is enabled via system interface by writing data at higher than the
internal display operation frequency to a certain degree, which guarantees rewriting the moving picture
RAM area without causing flicker on the display.
The data is written in the internal RAM. Therefore, when moving picture is displayed, data is written only
to the moving picture display area without using RGB or VSYNC interface, minimizing number of data
transfer required for moving picture display.
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RAM data
write via
system interface
Display operation
synchronized with
internal clock
FMARK
Figure 39 Moving Picture Data Transfers via FMARK Function