GC5316 datasheet(61/75 Pages) TI

61 / 75 page

GC5316

SLWS154A − JANUARY 2004 − REVISED MARCH 2004

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5.1.9 DUC Channel Controls

These controls are used by the DUC channels. These follow the duc <channel_number> keyword in the cmd5316

configuration file.

VARIABLE NAME

TYPE

PAGE

ADDRESS

LSB

POSITION

BIT

WIDTH

DEFAULT

DESCRIPTION

symmetric_pfir

0100

When asserted the block’s PFIR is

symmetric. DUC only

symmetric_cfir

0100

When asserted the block’s CFIR is

symmetric. DUC only

pmeter_integration_duc

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_duc

0100

The delay from selected sync source to when

the power calculation starts.

pmeter_interval_duc

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 64

sample units.

pilot_gain_0

0100

Pilot channel gain word, aligned with MSB of

the input data. 0xFFFF generates a full scale

complex pilot signal added to the user signal.

Setting the gain to 0x0000 causes no pilot

signal to be added. Only valid for UMTS,

should be set to 0x0000 for CDMA.

pilot_gain_1

0100

This value MUST be set to the same value as

pilot_gain_0.

pilot_psc_lsb

0100

The lower 16 bits of the 18-bit pilot X LFSR

initial value. This 18b word is loaded on pilot

sync event. The value loaded here that

corresponds to 3gpp primary scrambling code

(PSC) 0 is 0x00001. Users must calculate the

correct initial value to implement the other 511

PSCs.

pilot_psc_msb

0100

The upper 2 bits of the 18-bit pilot X LFSR

initial value. This 18b word is loaded on pilot

sync events. The value loaded here that

corresponds to 3gpp primary scrambling code

(PSC) 0 is 0x00001. Users must calculate the

correct initial value to implement the other 511

PSCs.

pilot_diversity

0100

Select between main and diversity pilot

symbol generation. (0=main, 1=diversity)

pilot_delay

0100

Unsigned delay value in chips from the pilot

sync event, from 0 to 38399 chips.

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