PCF5083 datasheet(69/136 Pages) PHILIPS

69 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

CM_decoder_TCHFS

Channel decoder and de-interleaver for the full-rate speech trafﬁc channel

and FACCH in accordance with

“GSM Rec. 05.03”. The CMI values located

in TCH_CMI_BUFF are decoded. The decoded bits are stored in

SCRATCH_BUFF.

rxqual_ber (format 16-bit integer) reﬂects the estimated bit error rate at the

input of the channel decoder (hard decision assumed) multiplied by 4096.

bﬁ_facch is the bad frame indication:

bﬁ_facch = 0; the decoded FACCH message is OK

bﬁ_facch = 1; a parity error has been detected

bﬁ_facch = 2; a bad metric error has been detected

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

The facch_ﬂag indications:

facch_ﬂag = 0; indicates that no FACCH message has been received. In

this event facch_msg[12] contains zeros

facch_ﬂag = 1; indicates that a FACCH message has been decoded and is

returned into facch_msg[12].

The facch_msg[12] contains the 184 bits of the decoded FACCH message.

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

order. Unused MSB’s are set to zero.

−

rxqual_ber

bﬁ_facch

facch_ﬂag

facch_msg[12]

CM_decoder_TCHFS_init

Initialization of CM_decoder_TCHFS.

−−

CM_encoder_CCH

Channel decoder for control channels. In accordance with

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

SACCH: Slow Associated Control Channel

SDCCH: Stand-alone Dedicated Control Channel.

The encoded data is stored in CCH_INFO_BUFF.

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

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

Unused MSB’s are set to zero.

cch_msg[12]

−

DESCRIPTION

PARAMETERS

RETURN

VALUES

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