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NXP Semiconductors
PNX15xx/952x Series
Volume 1 of 1
Chapter 12: Video Input Processor
PNX15XX_PNX952X_SER_N_4
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 4.0 — 03 December 2007
12-444
Four sequential ANC preamble bytes, 00, FF, FF and a qualied DID word, enable
ANC data capture. A qualied DID word is dened:
masked AUX_ANC-enabled ID matched (see Figure 13) bit 8 is even parity for bit 7-0(10-bit data mode) / bit 7-2(8-bit data mode)
bit 9 = not bit 8
2 LSBs of both ID_MASK_0 and ID_MASK_1 need to be programmed to 2’b00 in 8-
bit data mode to prevent unexpected results.
In the type 1 case, the data block number (DBN) distinguishes successive data
packets with a common data ID. In the type 2 case, the DID is followed by the
secondary identication (SDID). The captured packed length is taken form the data
count (DC) byte.
A value of DC=0 will capture exactly four data words consisting of DID, DBN (or
SDID), DC and checksum (CS). If DC is not equal to 0, additional user data words
dened by DC are captured. Parity bits for DBN (or SDID) and DC bytes are not
checked.
Auxiliary Data Acquisition Window
The auxiliary data acquisition window can be used to capture either VBI data or an
additional region of video data. It provides yet another capture-window. The eld
identier is compared against
AUX_CFEN bits at the start of the programmed window
to control whether a eld is captured or not. The start and end points of the auxiliary
window are dened by the AUX Window Start and End registers at offsets 00180 and
00184 (
AUX_XWS, AUX_YWS, AUX_XWE, AUX_YWE).
The
AUX_XWS parameter species the number of the rst pixel to be captured after
the HREF reference edge.The
AUX_YWS parameter species the number of the rst
line to be captured after AUX reference edge.
The
AUX_XWE parameter species the number of the last pixel to be captured.The
AUX_YWE parameter species the number of the last line to be captured.
Pixel and lines start counting at 0.
Figure 14: ANC Masked ID Checking
data stream DID word
3
4
1
2
0
8
9
6
7
5
MSB
LSB
3
4
1
2
0
6
7
5
3
4
1
2
0
6
7
5
ID of 10-bit data
ID of 8-bit data
ID_MASK_0/ID_MASK_1
DATA_ID_0/DATA_ID_1
ID_MASK_*[i] bit enables
DATA_ID_*[i] bit checking
on bit i of a data stream
DID word