TLK6002 datasheet(31/96 Pages) TI

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TLK6002

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SLLSE34 – MAY 2010

In full rate mode, the latency measurement function runs off of an internal clock which is equal to the

frequency of the transmit serial bit rate divided by four. In half rate mode, the latency measurement

function runs off of an internal clock which is equal to the serial bit rate divided by two. In quarter rate

mode, the latency measurement function runs off of an internal clock which is equal to the serial bit rate.

In eighth rate mode, the latency measurement function runs off of a clock which is equal to twice the serial

bit rate. The latency measurement accuracy in all cases is equal to plus or minus one latency

measurement clock period. The measurement clock can be divided down if a longer duration

measurement is required, in which case the accuracy of the measurement is accordingly reduced. The

high speed latency measurement clock is divided by either 1, 2, 4, or 8 via register 16.5:4. The

measurement clock used is always selected by the channel under test. The high speed latency

measurement clock may only be used when operating at one of the eight serial rates specified in the

CPRI/OBSAI specifications. It is also possible to run the latency measurement function off of the

recovered byte clock for the channel under test (and gives a latency measurement clock frequency equal

to the serial bit rate divided by 10) via register bit 16.2 (where the 16.5:4 divider value setting is ignored).

The accuracy for the standard based CPRI/OBSAI application rates is shown in Table 2-6, and assumes

the latency measurement clock is not divided down per user selection (division is required to measure a

duration greater than 682 µs). For each division of 2 in the measurement clock, the accuracy is also

reduced by a factor of two.

Table 2-6. CPRI/OBSAI Latency Measurement Function Accuracy

(Undivided Measurement Clock)

Clock Frequency

Accuracy

Gbps

Rate

(GHz)

(± ns)

0.6144

Eighth

1.2288

0.8138

0.768

Eighth

1.536

0.6510

1.2288

Quarter

1.2288

0.8138

1.536

Quarter

1.536

0.6510

2.4576

Half

1.2288

0.8138

3.072

Half

1.536

0.6510

4.9152

Full

1.2288

0.8138

6.144

Full

1.536

0.6510

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