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參數(shù)資料
| 型號(hào)： | CLC021AVGZ-5.0 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SMPTE 259M Digital Video Serializer with EDH Generation and Insertion |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | MERTIC, PLASTIC, QFP-44 |
| 文件頁(yè)數(shù)： | 11/18頁(yè) |
| 文件大?。?/td> | 428K |
| 代理商： | CLC021AVGZ-5.0 |
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Device Operation
(Continued)
TEST PATTERN GENERATOR
The CLC021 includes an on-board
test pattern generator
(TPG)
. Four full-field component video test patterns for both
NTSC and PALstandards, and 4x3 and 16x9 raster sizes are
produced. The test patterns are: flat-field black, PLL patho-
logical, equalizer (EQ) pathological and a modified 75%,
8-colour vertical bar pattern. The pathologicals follow recom-
mendations contained in SMPTE RP 178–1996 regarding
the test data used. The colour bar pattern does not incorpo-
rate bandwidth limiting coding in the chroma and luma data
when transitioning between the bars. For this reason, it may
not be suitable for use as a visual test pattern or for input to
video D-to-A conversion devices unless measures are taken
to restrict the production of out-of-band frequency compo-
nents.
The TPG is operated by applying the code for the desired
test pattern to D0 through D3 (D4 through D9 are 00h). Since
all parallel data inputs are equipped with internal pull-down
devices, only those inputs D0 through D3 which require a
logic-1 need be pulled high. Next, apply a 27 MHz or 36 MHz
signal, appropriate to the raster size desired, at the P
CLK
input and wait until the Lock_Detect output goes true indi-
cating the VCO is locked on frequency. Then, take
TPG_Enable, pin 29, to a logic high. The serial test pattern
data appears on the SDO outputs. The Lock_Detect output
may be temporarily connected to TPG_Enable to automate
TPG operation. The TPG mode is exited by taking TPG_En-
able to a logic low.
Table 1
gives device pin functions for this
mode.
Table 2
gives the available test patterns and selection
codes.
10136806
FIGURE 6. Built-In Self-Test Control Sequence
10136807
FIGURE 7. Test Pattern Generator Control Sequence
C
www.national.com
11
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| CLC030VEC | SMPTE 292M/259M Digital Video Serializer with Video and Ancilliary Data FIFOs and Integrated Cable Driver |
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