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AM7968 датащи(PDF) 11 Page - Advanced Micro Devices |
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AM7968 датащи(HTML) 11 Page - Advanced Micro Devices |
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11 / 127 page ![]() AMD 7 Am7968/Am7969 multiplier is switched out, and the internal logic is clocked directly from the CLK pin. Test Mode 2 is in- cluded to ease Automatic Test Equipment (A.T.E.) test- ing by making the internal logic of the Transmitter synchronous to the external clock instead of the internal PLL. TSERIN Test Serial Input (Pseudo ECL Input) This pin is left unconnected in Local Mode operation. TSERIN can be used to input serial data patterns into the Shifter in Test Mode 1 operation. VCC1, VCC2, VCC3 Power Supply VCC1, VCC2, and VCC3 are +5.0 volt nominal power sup- ply pins. VCC1 powers TTL I/O, VCC2 powers ECL and VCC3 powers internal Logic and Analog circuitry. X1, X2 Crystal Oscillator Inputs (Inputs) The two crystal input pins connect to an internal parallel mode oscillator which operates at the fundamental fre- quency of the external crystal. The byte rate matches the crystal frequency. During normal operation, the byte rate is set by the crystal frequency. Alternatively, X1 can be driven by an external TTL fre- quency source. In multiple TAXI systems this external source could be another Am7968’s CLK output. |
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