GC5316 datasheet(58/75 Pages) TI

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GC5316

SLWS154A − JANUARY 2004 − REVISED MARCH 2004

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5.1.8 DDC Channel Controls

These controls are used by the DDC channels. These follow the ddc <channel_number> keyword in the cmd5316

configuration file.

VARIABLE NAME

TYPE

PAGE

ADDRESS

LSB

POSITION

BIT

WIDTH

DEFAULT

DESCRIPTION

pmeter_integration_ddc

0100

This is the number of four sample sets to

accumulate for a power measurement. In

CDMA mode, one sample set is the I and Q

of the signal and diversity. Ia and Qa (signal)

are each squared and accumulated and Ib

and Qb (diversity) are squared and

accumulated. In UMTS mode, each I and Q

pair are squared and accumulated. Four

samples are equal to one integration count.

The count is initiated when the sync is

asserted or when the interval start time is

reached. When the integration count is

reached, the accumulated powers are made

available for MPU access and an interrupt is

generated.

pmeter_sync_delay_ddc

0100

The delay from selected sync source to

when the power calculation starts.

pmeter_interval_ddc

0100

The start interval timer is the interval over

which the integration is restarted and must

be greater than the integration count. The

interval start counter and RMS power

accumulation is started at the sync pulse

after the programmed delay and every time

the interval counter reaches its limit. This

value is in 1024 sample units.

cic_gain_ddc

0100

Adds a fixed gain of 12 dB at the CIC output

when asserted.

test_ena

0100

TEST BIT. Set to ’0’ for normal operation.

agc_dbelow

0100

The value to shift the gain that is then added

to the accumulator when the value of the

incoming data x current gain value is below

the Threshold.

agc_dabove

0100

The value to shift the gain that is then

subtracted from the accumulator when the

value of the incoming data x the current gain

value is above the Threshold.

agc_dzero

0100

The value to shift the gain that is then added

to the accumulator when the value of the

incoming data x current gain values

consistently equal to zero.

agc_dsat

0100

The value to shift the gain that is then

subtracted form the accumulator when the

value of the incoming data x the current gain

value is consistently equal to maximum.

agc_zero_msk

0100

Masks the lower 4 bits of the magnitude of

the input signal so that they are counted as

zeros.

agc_rnd

0100

Determines where to round the output of the

AGC. 0000 is 18 bits are out. The number of

bits out of the agc is 18 − agc_rnd.

agc_thres

0100

This is the threshold that the data x gain is

compared to. This value is compared to the

magnitude of the upper eight bits of the agc

output. (Input x gain).

GC5316 Datasheet(PDF) 58 Page - Texas Instruments

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