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AD9545 Datasheet(PDF) 110 Page - Analog Devices |
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AD9545 Datasheet(HTML) 110 Page - Analog Devices |
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110 / 157 page  AD9545 Data Sheet Rev. A | Page 110 of 157 TIMESTAMPS TIMESTAMPS OVERVIEW The AD9545 has 11 time stamp sources: • REFA TDC • REFAA TDC • REFB TDC • REFBB TDC • DPLL0 feedback TDC • DPLL1 feedback TDC • Auxiliary TDC 0 • Auxiliary TDC 1 • Ping pong TDC • Auxiliary NCO 0 • Auxiliary NCO 1 Most of the time stamp sources in the AD9545 are TDCs. The ping pong TDC, however, is an indirect time stamp source (see the Ping Pong TDC section of the Auxiliary TDCs section). The Auxiliary NCOs also generate timestamps (see the Auxiliary NCOs section), but without using a TDC. In general, the timestamp 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. The exception to this rule is the ping pong TDC (see the Ping Pong TDC section). 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 Access to Time Stamps 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 AD9545. However, not every time stamp source can connect to every time stamp destination. Table 51 summarizes the interconnections of the various time stamp sources to potential destinations. X means valid connection. Table 51. Time Stamp Source/Destination Matrix Time Stamp Destination Time Stamp Source DPLL0 Reference input DPLL1 Reference input SYSCLK Compensation PLLReference input Time Skew Measurement input User Time Stamp Processor Input REFA TDC X X X X X REFAA TDC X X X X X REFB TDC X X X X X REFBB TDC X X X X X DPLL0 Feedback TDC X X X DPLL1 Feedback TDC X X X Auxiliary TDC0 X X X Auxiliary TDC1 X X X Ping Pong TDC X X Auxiliary NCO 0 X X X X Auxiliary NCO 1 X X X X |
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