saa6712e NXP Semiconductors, saa6712e Datasheet - Page 53

• Manufacturer Part Number: saa6712e
• Description: Xga Rgb To Tft Graphics Engine
• Manufacturer: NXP Semiconductors

Philips Semiconductors
8.12.2
The output frame contains three main regions:
The blanking region contains all front and back porch as
well as the synchronization intervals. The border region is
visible on the panel and is used for positioning the active
video region inside this visible area. To ensure a great
flexibility in the ‘sync to input’ mode there are 3 different
horizontal length counters (h_len_blank, h_len_border,
h_len_active) with independent length control
(see Fig.17).
1999 Aug 25
handbook, full pagewidth
Blanking region
Border region
Active video region.
XGA RGB to TFT graphics engine
v_vs_end
v_active
v_end
v_start
F
starting point
RAME GENERATION
PVS
h_hs_start
h_de_start
h_hs_end
h_active_start
Fig.17 Output frame and timing.
53
active video
blanking
border
A maximum value must be programmed in h_max_len
which is the upper limit for line lengthening during
activated control mechanism. In free running mode all
3 counters should be programmed with the same
minimum values.
If no border is needed, because the active video region
covers the visible area of the panel, the active video length
counters should point to the same positions as the border
length counters. Then the active video length counters
have a higher priority.
The border colour inserted by the output interface is the
same as the blank colour in the memory interface;
blank_colour_red, blank_colour_green,
blank_colour_blue.
PHS
h_de_end
h_len_active
h_len_border
Preliminary specification
SAA6712E
h_len_blank
h_max_len
MHB262