SingMai Electronics SM06. Advanced Composite Video Interface: HD-SDI to acvi converter module. User Manual. Revision 0.
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1 SM06 Advanced Composite Video Interface: HD-SDI to acvi converter module User Manual Revision st May 2017 Page 1 of 26
2 Revision History Date Revisions Version First Draft Added support for NTSC/PAL encoding Updates for Revision 2 PCB DVI inputs removed. NTSC/PAL inputs removed. Minor schematic changes. Auto standard detection of 29/59Hz standards. 0.4 Page 2 of 26
3 Contents Revision History... 2 Contents... 3 Tables... 3 Figures Introduction acvi Overview Connecting up the module Automatic Cable length compensation Circuit description Specification Power Supply Specification Tables Table 1 acvi supported video formats... 5 Figures Figure 1 SM06 module...4 Figure 2 acvi Spectrum....6 Figure 3 SM06 Interconnections Figure 4 UTP connector pin assignments...8 Figure 5 SM06 Data slicing selection - J Figure 6 acvi cable length compensation (lines 7,8 and 9 of the VBI) Figure 7 Original HD-SDI image (screen capture) Figure 8 acvi image after transmission through 300m of RG59 cable (screen capture) Figure 9 SM06 Schematics - Sheet Figure 10 SM06 Schematics - Sheet Figure 11 SM06 Schematics - Sheet Figure 12 SM06 Schematics - Sheet Figure 13 SM06 Schematics - Sheet Figure 14 SM06 Schematics - Sheet Figure 15 SM06 Schematics - Sheet Figure 16 SM06 Schematics - Sheet Figure 17 SM06 Schematics - Sheet Figure 18 SM06 Schematics - Sheet Figure 19 Power supply specification, Page Figure 20 Power supply specification, Page Page 3 of 26
4 1. Introduction SM06 is a transmitter module compatible with the acvi Advanced Composite Video Interface format. SM06 accepts HD-SDI input format which it converts to analogue acvi encoded video for driving both twisted pair and coaxial cable. acvi is a method to transmit HD video over long distances of existing coaxial or twisted-pair cable networks or allow the use of less expensive RG-59/UTP cable in long distance installations. SM06 supports the following HD standards: 720p-25/30/50/59.94/60Hz, 1080p-24/25/29.97/30Hz and 1080i-50/59.94/60Hz. Switching between standards is automatic. Figure 1 SM06 module. Page 4 of 26
5 2. acvi Overview The following is a brief overview of the acvi interface. The basic concept of the acvi interface is to build on the proven and reliable transport method of NTSC. NTSC is capable of transmitting more than 1km across RG-59 cable but the bandwidth is limited to 5MHz. Because the cable system is a closed system, it is only necessary for the transmitter and receiver to understand each other and we can modify the basic NTSC method to suit HD transmissions. According to the SMPTE-296M specification, HD (74.25MHz sampling) video transmission requires a luma bandwidth of 30MHz and chroma bandwidth of 15MHz. To save on system costs acvi supports the 30MHz luma bandwidth but constrains the chroma bandwidth to 7.5MHz (4:1:1 sampling). The colour difference signals are modulated onto a carrier in quadrature so they effectively use the same bandwidth: the chroma subcarrier is ~24.75MHz.. The high frequency luma and the modulated chroma overlap above 12.4MHz but because of the line to line phase relationship of the chroma, may be separated using a line comb filter (and also because of the use of single chip image sensors, there is usually little high frequency content to cause image artifacts). The effective bandwidth of the complete signal is therefore approximately 12.3MHz (chroma upper sideband + filter roll off) MHz or about 37MHz, setting a minimum sampling frequency of 2 x 37MHz or 74MHz. For convenience we choose 74.25MHz as a sampling frequency as this is related to the SMPTE272M standard; (see Figure 2). For transmission over 300m of RG-59 cable we can expect 18dB loss at higher frequencies 50MHz). However the synchronizing signals are at a much lower frequency where the loss is only about 1-2dB so reliable rastering of the received signal should always be assured. The peak to peak video level of acvi is 1.8V (75% colour bars) which maintains compatibility with any legacy SD equipment on the network and also allows common low-power 5V drivers to be used. Table 1 lists the currently supported video formats for acvi. Format Pixels/line Line F SC /F H Subcarrier frequency ratio 720p/25Hz kHz MHz 720p/30Hz kHz MHz 720p/50Hz kHz MHz 720p/59.94Hz kHz MHz 720p/60Hz kHz MHz 1080p/24Hz kHz MHz 1080p/25Hz kHz MHz 1080p/29.97Hz kHz MHz 1080p/30Hz kHz MHz 1080i/50Hz kHz MHz 1080i/59.94Hz kHz MHz 1080i/60Hz kHz MHz 1 Input clock is MHz (else 148.5MHz). Table 1 acvi supported video formats. Page 5 of 26
6 Figure 2 acvi Spectrum. Page 6 of 26
7 3. Connecting up the module The SM06 module is powered by a universal input (90-260VAC) AC-DC adaptor (see Chapter 7 for the power supply specification). The 5VDC, 12W output of this adaptor should be connected to the jack input, +5V IN, of the SM06. Once connected, the yellow LED, FPGA OK should light, indicating the FPGA has been correctly configured and the module is running. Figure 3 shows the SM06 interconnections. Figure 3 SM06 Interconnections. SM06 accepts HD-SDI inputs: switching between the input standards is automatic. If a valid HD-SDI clock is detected on the input, the SDI LOCK LED will light. If the HD-SDI input has valid TRS timing pulses and is one of the supported acvi video standards shown in Table 1 the acvi encoder will convert the HD-SDI signal to an acvi output. SM06 provides simultaneous single ended coaxial and differential twisted-pair (UTP) outputs. The UTP outputs are connected via a RJ45 style connector. Figure 4 shows the pin assignments for the connector: acvi assumes the UTP cable connections are straight so both the transmitter and receiver use pin 1 for the VIDEO+ (non-inverted) signal, and pin 2 VIDEO- (inverted) signal. Page 7 of 26
8 Figure 4 UTP connector pin assignments. Should the input to the SM06 be removed or fail, the SM06 will switch to an internal colour bar generator. The output video standard will be whatever was last detected on the inputs (e.g. if the last detected input was 1080p/30Hz, the output will be 75% colour bars at 1080p/30Hz standard). If no valid input has previously been detected, the colour bar output will default to 720p/60Hz. Note that the colour bar generator will not operate if the input standard is 720p/59.94Hz, 1080p/29.97Hz or 1080i/59.94Hz. The SM06 will be shipped set for your requested cable choice (i.e. coaxial or UTP) and is indicated in the serial number label on the bottom of the module (COAX or UTP). For the automatic cable compensation and data transfer to operate correctly it is necessary to select the cable input to extract the data from. To do this, remove the end panel with the HD-SDI input and RS232 connector from the SM06 by removing the four screws in the corners of the panel and pulling off the panel and black bezel. The top panel can then be slid off (see Figure 5). Figure 5 SM06 Data slicing selection - J9. Page 8 of 26
9 Data from the receiver to the transmitter in acvi mode is selected by J9. J9 pins 1-2 should be connected to select the coaxial acvi input, or J9 pins 2-3 connected for the UTP acvi input: Pull off the small pin header and place over the pins you require for your cable type. The panels can then be refitted. Page 9 of 26
10 4. Automatic Cable length compensation. acvi automatically compensates for the cable length. It does this using a special test signal that is inserted into the acvi video source signal. The acvi transmitter inserts a video test signal into line 9 of the vertical blanking interval (VBI). This test signal comprises a reference white and black bar and a high frequency sinewave burst signal. The amplitude difference between the white and black references and the peak to peak frequency burst are measured by the acvi receiver (SM08) the difference indicates the high frequency loss of the cable. To compensate for the high frequency loss the acvi transmitter uses a pre-emphasis filter which attenuates the lower frequencies with a frequency response characteristic similar to that of the cable. The acvi receiver transmits data to the transmitter (on line 8 of VBI) which the transmitter decodes and uses to control the amount of pre-emphasis. The pre-emphasis is increased until the high frequency amplitude and the DC amplitude are equal. The transmitter also echoes back the pre-emphasis value to the receiver to check the transmission is working correctly (on line 7 of the VBI). Figure 6 shows lines 7, 8 and 9 of the VBI. Figure 6 acvi cable length compensation (lines 7,8 and 9 of the VBI). Adjusting the pre-emphasis reduces the amplitude of the lower frequencies, which includes the synchronizing pulses. This is compensated for by an analogue automatic gain control (AGC) at the receiver. Up to 18dB of analogue gain can be applied on the SM08, allowing full compensation beyond 300m of RG-59 type coaxial cable. Beyond this distance, or with cable that attenuates high frequencies more, the SM08 can apply automatic chroma gain to maintain saturation of the colours. At these extreme distances the luma frequency response will be reduced below the specification and the transmission may switch to monochrome. Figure 7 shows a screen capture of a camera test pattern image (HD-SDI) and Figure 8 shows that same image after acvi transmission through 300m of RG-59 coaxial cable. Page 10 of 26
11 Figure 7 Original HD-SDI image (screen capture). Figure 8 acvi image after transmission through 300m of RG59 cable (screen capture). Page 11 of 26
12 5. Circuit description Figures 9-18 show the schematics for the SM06. Below is a brief technical description of the module. Sheet 1. J3 is the 5VDC power input connector to the SM06 module. The 5VDC is protected from reverse polarity and over-range inputs by D1, D2 and the resettable fuse, F1. The input is then filtered by L1 and C2 to provide the clean 5VDC for the analogue output stage and also linearly regulated by U1 and U20 to provide the 3.3VDC and 2.5VDC supply voltages. Sheet 2. U2 provides the 1.2VDC for the internal voltage of the FPGA. U3 provides the 2.5VDC for the analogue PLL circuity of the FPGA and L2 and C25 filter the VCCINT for the FPGA PLL digital blocks. U12 provides the 1.8V for the HDMI receiver with LC networks providing isolation for the various individual rails. Sheet 3. J1 is the DVI/HDMI input connector. U13 and U14 protect the HDMI receiver from overshoots on the TMDS signals and U15 does the same for the control signals. The hot plug detect signal, indicating the presence of a HDMI source, is shown by LED, D5. Sheet 4. U16 is the HDMI receiver IC, an Analog Devices ADV7611. The output from this IC is Y,Cb,Cr in 4:2:2 format. In free-run mode this IC provides the fixed 74.25MHz clock. The video input standard is read from the ADV7611 status registers. Sheet 5. U4 is the cable equalizer for the HD-SDI input. U18 deserialises the 1.485GHz input to five LVDS inputs and a DDR clock. Further demuxing, extraction of the TRS timing signals and the video formatting is performed by the FPGA. LED D9 lights if U18 is able to lock to incoming HD-SDI signal. The input standard is also determined by the FPGA. Sheet 6. U19 is the FPGA. The FPGA is an Altera EP4CE15 device in a 144 pin 0.5mm TQFP package. The FPGA contains the PT55 acvi encoder, a SingMai PT13 control microprocessor, a colour bar generator and the HD-SDI input decoder. Sheet 7. The FPGA is a volatile device and needs configuring on switch on, which it does using U5, a 4Mb EEPROM. The device is automatically configured on switch on, and successful configuration is indicated by LED, FPGA OK. The EEPROM may also be reprogrammed via J4, which is compatible with the Altera USB-Blaster and the Quartus Programmer. Sheet 8. X1 is a 27MHz crystal oscillator, and is used to clock the PT13 microprocessor and also as a fixed time-base to determine the HD-SDI input standard. U7 is a proprietary copy-protection IC. U7 calculates a checksum from a PT13 generated data stream, and the calculated checksum from U7 is compared with an FPGA internally generated checksum. If the two do not match the SM06 module is shut down. This means that even if the bit stream of the FPGA/EEPROM is captured the PT55 IP core will not run without U7 being fitted. U17 is an RS232 level translator. Page 12 of 26
13 Sheet 9. U8 is a 10 bit digital to analogue converter (DAC). The DAC converts the acvi encoded digital data to an analogue signal of 0-1.0V amplitude. The DAC is clocked at 148.5MHz. U6 provides a clean 3.3V for the DAC. U21 amplifies the DAC output to provide a 1.8V pk-pk output for driving the outputs and U9 provides a programmable low pass filter to remove the clock from output video and reconstitute the waveform. Sheet 10. U10-A buffers the coaxial acvi video while U23 converts the differential acvi to a single ended output. J9 selects the input from either the coaxial connector (connect J9 pins 1-2) or the UTP connector (connect J9 pins 2-3). U10-B filters the input signal and C50 and D3 form a sync tip clamp to ensure stable DC levels into the data slicer. The data slicer is formed by comparator U10-D and buffered by U11 before being decoded by the PT55 acvi encoder IP core. Page 13 of 26
14 Figure 9 SM06 Schematics - Sheet 1. Page 14 of 26
15 Figure 10 SM06 Schematics - Sheet 2. Page 15 of 26
16 Figure 11 SM06 Schematics - Sheet 3. Page 16 of 26
17 Figure 12 SM06 Schematics - Sheet 4. Page 17 of 26
18 Figure 13 SM06 Schematics - Sheet 5. Page 18 of 26
19 Figure 14 SM06 Schematics - Sheet 6. Page 19 of 26
20 Figure 15 SM06 Schematics - Sheet 7. Page 20 of 26
21 Figure 16 SM06 Schematics - Sheet 8. Page 21 of 26
22 Figure 17 SM06 Schematics - Sheet 9. Page 22 of 26
23 Figure 18 SM06 Schematics - Sheet 10. Page 23 of 26
24 6. Specification Power: +5VDC ± ~450mA. Dimensions: 120mm x 78mm x 27mm. HD-SDI input: SMPTE-292M, 20 bit 4:2:2 YCbCr format. Video standards: 720p/25Hz,720p/30Hz, 720p/50Hz, 720p/59.94Hz, 720p/60Hz 1080p/25Hz, 1080p/29.97Hz, 1080p/30Hz, 1080i/50Hz, 1080i/59.94Hz, 1080i/60Hz. Luma bandwidth: 29.7MHz ± 1dB MHz. Chroma bandwidth: 7.5MHz ± 1dB. 12.3MHz. Transmission distance: >300m of RG-59 coaxial cable. >500m RG-59 cable with reduced luma bandwidth. Latency: <100µs (transmitter HD-SDI input to receiver HD-SDI output). Operating temperature: 0 40 degc. Page 24 of 26
25 7. Power Supply Specification Figure 19 Power supply specification, Page 1. Page 25 of 26
26 Figure 20 Power supply specification, Page 2. Page 26 of 26
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