PCF5083 datasheet(65/136 Pages) PHILIPS

65 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

9.3.1

PROCEDURE DESCRIPTION

In this section all baseband procedures offered by the DSP are listed in alphabetical order. The following naming

conventions are used throughout the description:

• Value: this is a 16-bit integer parameter (call by value) or return value (e.g. training sequence code, dtx flag)

• Value [SIZE]: this is an array consisting of SIZE 16-bit words. The array is transmitted word by word between the

System Controller and the DSP (e.g. FACCH msg[12])

• Parameter names ending with buff_id identify a buffer in the DSP data RAM where input or output data of the

procedure is stored.

Table 58 Procedure description

DESCRIPTION

PARAMETERS

RETURN

VALUES

BB_access_burst

Burst building of a random access burst in accordance with

“

GSM Rec. 05.02”. The burst information bits must be located in

SCRATCH_BUFF. The result is returned in SCRATCH_BUFF.

−−

BB_normal_burst

Burst building of n_bursts normal bursts in accordance with

“GSM Rec. 05.02”. The burst information bits must be located in the buffer

determined by info_buff_id. The result is returned in buffer burst_buff_id.

‘tsc’ is the training sequence code (range: 0 to 7)

info_buff_id

burst_buff_id

tsc

n_bursts

−

CI_decrypt (note 1)

Decryption of the CMI values of n_bursts bursts stored in buffer

cmi_buff_id.

Note that n_bursts may be in the range from 1 to 4. If n_bursts is set to 4,

cmi_buff_id must not be any other than TCH_CMI_BUFF or

CCH_CMI_BUFF

cmi_buff_id

n_bursts

−

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