GC5316 datasheet(31/75 Pages) TI

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GC5316

SLWS154A − JANUARY 2004 − REVISED MARCH 2004

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Table 4. Programming

VARIABLE

DESCRIPTION

pilot_psc(15:0)

Lower 16 bits of the 18-bit pilot LFSR initial sequence.

pilot_psc(17:16)

Upper 2 bits of the 18-bit pilot LFSR initial sequence.

pilot_diversity

Sets main or diversity pilot generation. 0 = main, 1 = diversity

pilot_delay(15:0)

Unsigned delay value (in chips) from sync event. 0 to 38399 chips.

pilot_gain_0(15:0)

Gain value. pilot_gain_0 and pilot_gain_1 must be set to the same value for proper operation.

Must be set to 0 for CDMA operation.

pilot_gain_1(15:0)

Gain value. pilot_gain_0 and pilot_gain_1 must be set to the same value for proper operation.

Must be set to 0 for CDMA operation.

ssel_pilot(2:0)

Sync source

3.1.4 Transmit Channel RMS Power Meter

Sync

Event

Sync Delay

Integration

Start

Integration Time

Integration

Start

Integration Time

Interval Time

Integration

Start

Interval Time

Interrupt

Time

Integrate

50 bits

Clear

Transfer

13 Bits

(in increments of 4 samples)

Sync

RMS Power

Interrupt

Sync D elay

C ounter

7Bits

(in samples)

I nterval

Counter

9Bits

(in increments of

64 samples)

pmeter_sync_delay_duc

Top

pmeter_integration_duc

Integration Period Counter

pmeter_interval_duc

Power Measurement Time Line

Figure 26. Transmit Channel RMS Power Meter

Each transmit channel includes an RMS power meter used to measure the RMS power within the channel.

Functionally, the power meter block is identical to the RMS power meter blocks used in the receive chain.

The power meter samples the I and Q data stream before the PFIR filter. Both 18-bit I and Q data are squared,

summed, and then integrated over a time determined by pmeter_integration_duc (13 bits). Integration time = 4 x

pmeter_integration_duc + 1 (in units of a sample period or generally a chip period).

There is a programmable 9-bit interval counter which sets the interval over which power measurements are repeated.

The timer counts in increments of 64 samples. The interval time = 64(pmeter_interval_duc+1) The interval time must

be greater than (not equal to) the integration time.

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