PCF5083HSLASHF2 datasheet(67/136 Pages) PHILIPS

67 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

CM_convert_TCHFS_data

This routine is used for the TCH/FS loop-back. It converts the output data of

CM_decoder_TCHFS into a format which is required for

CM_encoder_TCHS.

If bfi_sig_flag is set to logic 1, then the decoded speech parameters are set

to zero if a bad frame has been detected.

bﬁ_sig_ﬂag

−

CM_decoder_CCH

Channel decoder for control channels. In accordance with

“GSM Rec. 05.03” this procedure can be used for the following channels:

BCCH: Broadcast Control Channel

PCH: Paging Channel

SACCH: Slow Associated Control Channel

AGCH: Access Grant Channel

SDCCH: Stand-alone Dedicated Control Channel.

The four bursts containing CCH information which are stored in

CCH_CMI_BUFF are decoded

rxqual_ber reﬂects the estimated bit error rate at the input of the channel

decoder (hard decision assumed) multiplied by 4096.

bﬁ_cch bad frame indication:

bﬁ_cch = 0; the decoded CCH message is OK

bﬁ_cch = 1; a parity error has been detected

bﬁ_cch = 2; a bad metric error has been detected

bﬁ_cch = 3; both parity and bad metric errors have been detected.

cch_msg[12] contains the CCH message consisting of 184 bits. The bits

are stored in a packed format with 16-bits per word and LSB first order.

Unused MSBs are set to zero.

−

rxqual_ber

bﬁ_cch

cch_msg[12]

CM_decoder_SCH

Channel decoder synchronization channel.

bﬁ_sch is the bad frame indication:

bﬁ_sch = 0; the decoded SCH message is OK

bﬁ_sch = 1; a parity error has been detected

bﬁ_sch = 2; a bad metric error has been detected

bﬁ_sch = 3; both parity and bad metric errors have been detected.

sch_msg[2] contains the decoded SCH message consisting of 25 bits. The

bits are stored in a packed format with 16-bits per word and LSB ﬁrst order.

Unused bits are set to zero.

−

bﬁ_sch

sch_msg[2]

DESCRIPTION

PARAMETERS

RETURN

VALUES

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