mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 1052

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

Video Controller
19.5.2 PAL Example
The PAL (Phase Alternation Line) broadcast method defines a virtual screen of 625 lines,
which are 864 pixels long. However, you can only see 576 of these lines. Each horizontal
line contains 720 pixels during the active line period (which is visible to you) with the rest of
the line’s pixels presented during digital blanking. Figure 19-7 illustrates how the frame is
divided into six sections that correlate with the behavior of the FIELD and BLANK signals:
• Lines 1-22: Frame 0 blanking
• Lines 23-310: Frame 0 active video for odd lines
• Lines 311-312: Frame 0 for retrace blanking
• Lines 313-335: Frame 1 blanking
• Lines 336-623: Frame 1 active video for even lines
• Lines 624-625: Frame 1 retrace blanking
LINE BLANK FIELD
310
311
312
313
335
336
623
624
625
22
23
1
0/1
0/1
0/1
0/1
0
0
0
0
0
0
0
0
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 19-7. Interlaced PAL Format
0
0
0
0
0
0
1
1
1
1
1
1
MPC823 REFERENCE MANUAL
A B
A B
Go to: www.freescale.com
C
C
RETRACE BLANKING
RETRACE BLANKING
FRAME BUFFER B
FRAME BUFFER A
ACTIVE VIDEO
ACTIVE VIDEO
ODD FIELD
EVEN FIELD
BLANKING
BLANKING
D
D
E
E
FIELD 0
FIELD 1
MOTOROLA