
TM1100 Preliminary Data Book
Philips Semiconductors
7-16
PRELIMINARY INFORMATION
File: evo.fm5, modified 7/24/99
7.13.4
Frame and Field Timing Control
The frame timing for 525/60 and 625/50 cases is shown
pictorially in
Figure 7-26 for reference. CCIR 656 line
definitions are used.
7.13.5
Timing Registers Recommended
Values
The recommended values for the various fields of the
timing registers are shown in
Table 7-9 for 525/60 and
625/50 timing cases. The FREQUENCY field value
shown is for 27.0 MHz assuming a DSPCPU clock of
100.0 MHz.
7.14
VIDEO OUT OPERATION
The VO operates in either video refresh or data transfer
modes. The DSPCPU starts the VO by setting the Mode
field to the appropriate transfer mode, setting the appro-
priate addresses, address offsets, image timing registers
and the associated control bits in the Control register and
setting the VO Enable bit. The VO transfers the image or
message as commanded. In the video refresh and data-
streaming modes, the VO runs continuously. In the mes-
sage-passing mode, the VO runs only until the message
has been transferred.
VO_VADD
V_BASE_ADR
SIZE1
In video refresh modes, V-component starting byte address.
In data-streaming and message-passing mode, buffer 1 length in bytes. Note: Must be
multiple of 64 in data-streaming mode. SIZE1 is limited to 24bits, giving 16Mbyte maxi-
mum buffer or message length.
VO_OLADD
OL_BASE
SIZE2
In video refresh modes, overlay-image starting byte address. Note: Can be repro-
grammed on a frame by frame basis.
In data-streaming mode, buffer 2 length in bytes. Note: Must be multiple of 64 in data-
streaming mode. SIZE2 is limited to 24bits, giving 16Mbyte maximum buffer size.
Not used in message-passing mode.
VO_VUF
U_OFFSET
Offset in bytes from start of one line to start of next line.
V_OFFSET
Offset in bytes from start of one line to start of next line.
VO_YOLF
Y_OFFSET
Offset in bytes from start of one line to start of next line.
OL_OFFSET
Offset in bytes from start of one line to start of next line.
Table 7-8. Video Out Register FIelds
Register
Field
Description
Blanking: Field 2 Overlap
Blanking: Field 1
Video Image: Field 1
Blanking: Field 1 Overlap
Blanking: Field 2
Video Image: Field 2
525 Line / 60 Hz
4
20
264
266
283
525
Blanking: Field 1
Video Image: Field 1
Blanking: Field 1 Overlap
Blanking: Field 2
Video Image: Field 2
625 Line / 50 Hz
1
23
311
313
336
623
Blanking: Field 2 Overlap
624
625
1
Figure 7-26. Video Out frame timing.