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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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VMV3 датащи(PDF) 101 Page - Microsemi Corporation |
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VMV3 датащи(HTML) 101 Page - Microsemi Corporation |
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101 / 212 page  Military ProASIC3/EL Low Power Flash FPGAs Revision 3 2-87 Differential I/O Characteristics Physical Implementation Configuration of the I/O modules as a differential pair is handled by Designer software when the user instantiates a differential I/O macro in the design. Differential I/Os can also be used in conjunction with the embedded Input Register (InReg), Output Register (OutReg), Enable Register (EnReg), and Double Data Rate (DDR). However, there is no support for bidirectional I/Os or tristates with the LVPECL standards. LVDS Low-Voltage Differential Signaling (ANSI/TIA/EIA-644) is a high-speed, differential I/O standard. It requires that one data bit be carried through two signal lines, so two pins are needed. It also requires external resistor termination. The full implementation of the LVDS transmitter and receiver is shown in an example in Figure 2-26. The building blocks of the LVDS transmitter-receiver are one transmitter macro, one receiver macro, three board resistors at the transmitter end, and one resistor at the receiver end. The values for the three driver resistors are different from those used in the LVPECL implementation because the output standard specifications are different. Along with LVDS I/O, military ProASIC3 also supports Bus LVDS structure and Multipoint LVDS (M- LVDS) configuration (up to 40 nodes). Figure 2-26 • LVDS Circuit Diagram and Board-Level Implementation 140 100 Z0 = 50 Z0 = 50 165 165 + – P N P N INBUF_LVDS OUTBUF_LVDS FPGA FPGA Bourns Part Number: CAT16-LV4F12 |
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