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AD9546/PCBZ 数据表(PDF) 155 Page - Analog Devices |
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AD9546/PCBZ 数据表(HTML) 155 Page - Analog Devices |
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155 / 205 page  Data Sheet AD9546 Rev. 0 | Page 155 of 205 TIME STAMPS TIME STAMPS OVERVIEW The AD9546 has 14 time stamp sources. • REFA TDC • REFAA TDC • REFB TDC • REFBB TDC • DPLL0 feedback TDC • DPLL1 feedback TDC • Auxiliary REF0 TDC • Auxiliary REF1 TDC • Auxiliary REF2 TDC • Auxiliary REF3 TDC • Auxiliary NCO 0 • Auxiliary NCO 1 • IUTS 0 • IUTS 1 Most of the time stamp sources in the AD9546 are TDCs. The Auxiliary NCOs and IUTSs also generate time stamps (see the Auxiliary NCOs and Inverse User Time Stamper (IUTS) sections), but without using a TDC. In general, the time stamp sources require advance knowledge of the period of the applied input signal. For example, the REFA TDC requires the user to enter the nominal period of the REFA input signal. The user programs the nominal input period via the register map. Time stamps produced by the time stamp sources are not readily accessible by the user. Instead, the user accesses time stamps from the various time stamp sources by means of a user time stamp processor (see the User Time Stamp Processor (UTSP) section and User Time Stamper (UTS) section). DIGITAL CROSSPOINT MUX The digital cross point mux is an interconnect matrix allowing an array of time stamp destinations access to the various time stamp sources within the AD9546. However, not every time stamp source can connect to every time stamp destination. Table 92 summarizes the interconnections of the various time stamp sources to potential destinations, where a yes indicates a valid connection and a blank cell means invalid connection. Table 92. Time Stamp Source to Destination Matrix Time Stamp Destination Time Stamp Source DPLL0 Reference Input DPLL1 Reference Input SYSCLK Compensation PLL Reference Input Time Skew Measurement Input User Time Stamp Processor Input User Time Stamper (UTSx) Input REFA TDC Yes Yes Yes Yes Yes Yes REFAA TDC Yes Yes Yes Yes Yes Yes REFB TDC Yes Yes Yes Yes Yes Yes REFBB TDC Yes Yes Yes Yes Yes Yes DPLL0 Feedback TDC Yes Yes Yes Yes DPLL1 Feedback TDC Yes Yes Yes Yes Auxiliary REF0 TDC Yes Yes Yes Yes Yes Yes Auxiliary REF1 TDC Yes Yes Yes Yes Yes Yes Auxiliary REF2 TDC Yes Yes Yes Yes Yes Yes Auxiliary REF3 TDC Yes Yes Yes Yes Yes Yes Auxiliary NCO 0 Yes Yes Yes Yes Yes Auxiliary NCO 1 Yes Yes Yes Yes Yes IUTS 0 Yes Yes Yes Yes Yes IUTS 1 Yes Yes Yes Yes Yes |
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