AD9546SLASHPCBZ datasheet(155/205 Pages) AD

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

REFAA TDC

Yes

REFB TDC

Yes

REFBB TDC

Yes

DPLL0 Feedback TDC

Yes

DPLL1 Feedback TDC

Yes

Auxiliary REF0 TDC

Yes

Auxiliary REF1 TDC

Yes

Auxiliary REF2 TDC

Yes

Auxiliary REF3 TDC

Yes

Auxiliary NCO 0

Yes

Auxiliary NCO 1

Yes

IUTS 0

Yes

IUTS 1

Yes

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