PNX1300 Philips, PNX1300 Datasheet - Page 128

• Manufacturer Part Number: PNX1300
• Description: Media Processors
• Manufacturer: Philips

PNX1300/01/02/11 Data Book
Table 7-7. VO_CTL register fields
7.16.3
The VO-related registers and their fields are shown in
Table
Table 7-8. VO register fIelds
7-18
YTR_ACK
BFR1_INTEN
BFR2_INTEN
HBE_INTEN
URUN_INTEN
YTR_INTEN
LTL_END
VO_ENABLE
VO_CLOCK
VO_FRAME
VO_FIELD
VO_LINE
Register
Field
7-8. Their fields are unchanged from the TM-1000,
VO-Related Registers
FREQUENCY
FRAME_LENGTH
FIELD_2_START
FRAME_PRESET
F1_VIDEO_LINE
F2_VIDEO_LINE
F1_OLAP
F2_OLAP
FRAME_WIDTH
VIDEO
Acknowledge Y threshold.
Writing a ’1’ to this bit clears the YTR flag and resets its interrupt condition. YTR signals the CPU to set new point-
ers for the next field. If YTR_ACK is not received by the time the active image area for the next field starts, the
URUN flag is set. Data transfer continues with the old pointer values.
Enable interrupt conditions.
Enable corresponding interrupts to be generated when the BFR1_EMPTY, BFR2_EMPTY, HBE, URUN (under-
run/end of transfer), and YTR (end of field/buffer) flags are set, respectively.
Note: BFR2_INTEN, URUN_INTEN, YTR_INTEN must be 0 in message passing mode.
Little-endian.
Specifies that data in SDRAM is stored in little-endian format. This only affects the overlay packed-image format
interpretation in video-refresh modes. Refer to
Enable the EVO to send image data or message data to its output.
Note: This bit should not be simultaneously asserted with the RESET bit. The correct sequence to reset and
enable the EVO is as follows.
• Set all VO_CTL control fields as desired, writing VO_CTL with RESET = 1, VO_ENABLE = 0.
• Retain all desired values of control fields, but rewrite VO_CTL with RESE T =0, VO_ENABL E =0.
• Finally, still retaining all desired control fields, rewrite VO_CTL with RESET = 0, VO_ENABLE = 1.
Setting VO_ENABLE in video-refresh modes starts the EVO sending image data beginning with the first pixel in
the image. Setting VO_ENABLE in data-streaming and message-passing modes starts the EVO sending data
beginning with the first byte in Buffer 1. In video-refresh and data-streaming modes, VO_ENABLE remains set until
cleared by the CPU. In message-passing mode, VO_ENABLE is cleared when BFR1_EMPTY is set, indicating the
end of message transfer.
Note: De-asserting VO_ENABLE in video-refresh modes causes SDRAM reads to stop, but sync framing and
BFR1_EMPTY generation and interrupts remain fully operational. The transmitted active image data is undefined
in this case. To fully halt video output, a software reset is required.
_
PRELIMINARY SPECIFICATION
PIXEL
Field
_
START Pixel number in Frame Pixel Counter of starting pixel of active video area within the line.
VO_CLK frequency. See DDS equation in
Total number of lines per frame; the ending value of the Frame Line Counter; typically 525
or 625. Note: the Frame Line Counter counts from 1 to 525 or 625, consistent with
CCIR 656 line numbering.
Start line number in the Frame Line Counter; where the second field of the frame begins .
If non-interlaced pictures are desired, then the same value is programmed for Field 1 and
Field 2. Field 1 becomes Fram e1 and Field2 becomes Fr ame2 .
Value loaded into the Frame Line Counter when frame timing edge is received on VO_IO2.
Line number in the Frame Line Counter of the first active video line of Field1 of the frame .
Line number in the Frame Line Counter of the first active video line of Fiel d2 of the frame .
If non-interlaced pictures are desired, this is programmed to the same value as
F1_VIDEO_LINE
Overlap of the SAV and EAV codes from Field 1 to Field 2. Overlap is defined as the delay
in lines from start of blanking for Field 2 until SAV and EAV codes for Fiel d2 are emitted .
Typical values are +2 for 525/60 and +2 for 625/50.
Overlap in lines of the SAV and EAV code from Fiel d2 to Fiel d1. Overlap is defined as the
delay in lines from start of blanking for Field 1 until the SAV and EAV codes for Field 1 are
emitted. Typical values are +3 for 525/60 and –2 for 625/50. The negative value means
Field 1 blanking actually starts two lines before end of Fi eld2 of previous frame . This over-
lap is described in
Total line length in pixels including blanking. Also the ending value for the Frame Pixel
Counter. Lines always begin with a horizontal blanking interval, and the image starts after
the blanking interval and runs to the end of the line.
Note: Must be even.
Table 7-4 on page7-6
Appendix C, “Endian-ness,”
however their function may vary depending upon the
PNX1300 features that are selectively enabled by
EVO_CTL (see
Description
Description
, and illustrated in
Figure
Section
7-6, and PLL description in
for details on byte ordering.
7.16.4).
Philips Semiconductors
Figure
7-31.
Section
7.19.