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GS1500-CQR Arkusz danych(PDF) 9 Page - Gennum Corporation |
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GS1500-CQR Arkusz danych(HTML) 9 Page - Gennum Corporation |
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9 / 17 page  GENNUM CORPORATION 522 - 33 - 00 9 3. STANDARDS INDICATION VD_STD[3:0] indicates the standard that the device has detected. The states of VD_STD[3:0] are shown Tables 1 and 2. Note the following in the above Standards Indication Tables: • SMPTE260M is 1125 lines/frame • SMPTE274M is 1125 lines/frame • SMPTE295M is 1250 lines/frame • SMPTE296M is 750 lines/frame See Table 3 for more details on the source format parameters. 4. FLY WHEEL OPERATION The flywheel logic checks the incoming video data for valid video lines. If the incoming data represents a valid line, the flywheel remains in sync with the incoming data. If the incoming data represents an invalid line, the flywheel uses the stored timing information for the past valid line to generate the output HVF timing signals. When three consecutive lines having identical timing are detected, this new timing information is saved and the flywheel operation is updated to this new timing. Mismatches between the HVF information decoded from the data stream and that indicated by the flywheel will trigger the EAV_ERR and SAV_ERR signals as shown in Figure 3. HVF output timing is shown in Figure 2. 5. AUTOMATIC SWITCH LINE LOCK HANDLING The automatic switch line lock is based on the assumption that switching occurs between video sources of the same format. In other words, the switching of video sources causes only the H signal to be out of alignment whereas V and F signals remain in sync. Therefore, when in the automatic switch line lock mode (FAST_LOCK transitions for low to high), the flywheel positive H signal transition aligns with the detected positive H signal transition. Timing for the FAST_LOCK signal is shown in Figure 5. 6. FIFO The device does not flag transmission errors which might exist in the ANC data packages. The internal FIFO is 1024 words deep for each of LUMA and CHROMA channels. For those formats where the HANC region is greater than 1024 words, the user must take steps to ensure the FIFO does not overflow, otherwise data may be lost. The GS1500 provides status signals to indicate the current content level of the internal FIFO buffers, as described in section 6.1. 6.1. FIFO Status Bits The device provides status output signals FF_STA[2:0] that indicate the state of the current content level of the internal FIFO buffers. If the extracted ANC data have completely filled the internal FIFO buffer, FF_STA[2:0] outputs 110. When the internal FIFO is full, any attempt to write data into the FIFO will cause the FIFO to overrun. The device flags this overrun state by setting FF_STA[2:0]=111 and no more data will be extracted from the video stream. If all ANC data in the FIFO is accessed by the user through the FIFO interface and the internal FIFO becomes empty, then FF_STA[2:0] outputs 001. When the internal FIFO is empty, any attempt to read data from the FIFO will cause the FIFO to under run. The device flags this under run state by setting FF_STA[2:0]=000. When ANC_Y/C is high, FF_STA indicates the status of the LUMA FIFO buffer. When ANC_Y/C is low, FF_STA indicates the status of the CHROMA FIFO buffer. The FIFO status flags must be up-to-date. Therefore, certain FIFO status flags are synchronized with respect to R_CLK, and others are synchronized with respect to PCLK_IN. During a write cycle, status flags controlled by R_CLK experience a three-cycle latency with respect to R_CLK. During a read cycle, status flags controlled by PCLK_IN experience a three-cycle latency with respect to PCLK_IN. See Table 4 and Figures 6 to 15. TABLE 1. Progressive Scan Standards Indication (VD_STD[3]=0) VD_STD[3:0] DESCRIPTION 0000 720p (60 & 60/1.001Hz → L/M) [SMPTE296M] 0001 Reserved 0010 1080p (30 & 30/1.001Hz → G/H) [SMPTE274M] 0011 Reserved 0100 1080p (25Hz → I) [SMPTE274M] 0101 Reserved 0110 1080p (24 & 24/1.001Hz → J/K) [SMPTE274M] 0111 Unknown Progressive with F = 0 always. TABLE 2. Interlaced Standards Indication (VD_STD[3]=1) VD_STD[3:0] DESCRIPTION 1000 1080i (30 & 30/1.001Hz → D/E) [SMPTE274M] 1001 Reserved 1010 1080i (25Hz → F) [SMPTE274M] 1011 Reserved 1100 1080i (25Hz → C) [SMPTE295M] 1101 Reserved 1110 1035i (30 & 30/1.001Hz → A/B) [SMPTE260M] 1111 Unknown Interlaced with F switching 0/1 |
Podobny numer części - GS1500-CQR |
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Podobny opis - GS1500-CQR |
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