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XRT94L31 Datasheet(PDF) 11 Page - Exar Corporation |
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XRT94L31 Datasheet(HTML) 11 Page - Exar Corporation |
11 / 133 page XRT94L31 11 REV. 1.0.1 3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC P1 REFTTL I TTL 19.44MHz or 77.76MHz Clock Synthesizer Reference Clock Input Pin: The function of this input pin depends upon whether or not the Clock Synthesizer block is enabled. If Clock Synthesizer is Enabled. If the Clock Synthesizer block is enabled, then it will be used to generate the 155.52MHz, 19.44MHz and/or 77.76MHz clock signal for the Trans- mit STS-3/STM-1 circuitry. In this mode, the user should apply a clock signal of any of the following frequencies to this input pin. • 19.44 MHz • 38.88 MHz • 51.84 MHz • 77.76 MHz Afterwards, the user needs to write the appropriate data into the Trans- mit Line Interface Control Register (Address Location = 0x0383) in order to (1) configure the Clock Synthesizer Block to accept any of the above- mentioned signals and generate a 155.52MHz, 19.44MHz or 77.76MHz clock signal, (2) to configure the Clock Synthesizer to function as the Clock Source for the STS-3/STM-1 block. If Clock Synthesizer is NOT Enabled: If the Clock Synthesizer block is NOT enabled, then it will NOT be used to generate the 19.44MHz and/or 77.76MHz clock signal, for the STS-3/ STM-1 block. In this configuration seting, the user MUST apply a 19.44MHz clock signal to this input pin. NOTE: The user must place a clock signal to this input pin in order to perform READ and WRITE operations to much of the SONET/ SDH-related registers via the Microprocessor Interface. PIN DESCRIPTION OF THE XRT94L31 (REV. B) PIN # SIGNAL NAME I/O TYPE DESCRIPTION |
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