PCF5083HSLASHF2 datasheet(53/136 Pages) PHILIPS

53 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

9.1.5.3

Format of uplink data frames

The uplink data frame format is described in Table 43. Each word consists of four ﬁelds; these are described in Table 41.

Table 41 Field descriptions

Table 42 Classiﬁcation of the 16-bit samples

Note

1. The external terminal adaptor may insert at any position an arbitrary number of fill words with CMD = 11111.

Table 43 Uplink data frame format

Notes

1. X = don’t care.

FIELD

DESCRIPTION

DATA

This ﬁeld contains the data bytes of user data block and control data block. Only words with

CMD = 00001 contain valid data ﬁelds (see Table 42).

CMD

This ﬁeld classiﬁes the 16-bit samples as described in the Table 42.

SYNC, INFO

In uplink direction, these ﬁelds are without meaning.

CMD FIELD

DESCRIPTION

76543

00001

The data ﬁeld contains a valid data byte belonging to either a user or a control data block.

00010

The data ﬁeld contains auxiliary control information that may be used by the terminal

adaptor for synchronization purposes; note 1.

11111

Indicates that the data ﬁeld contains invalid data, which should be ignored.

Other combinations

Reserved for future expansion. Not used by the DSP.

OFFSET

DATA FIELD(1)

CMD FIELD

INFO FIELD

SYNC

FIELD

DESCRIPTION

15 14 13 12 11 10

User data block; this block

contains modiﬁed CCITT

frame in accordance with

“GSM Rec. 05.03”. It is

used as input data for the

channel encoder. LU is the

block length

Valid range: 0

≤ LU ≤ 33

1111

00001

U[0]

U[1]

U(LU

− 2)

00001

U(LU

− 1)

00001

Control data block; the

ﬁrst byte LC is the block

length. LC may also be

zero. This block is

forwarded to the System

Controller.

Valid range: 0

≤ LC ≤ 10.

C[0]

C[1]

C(LC

− 2)

00001

C(LC

− 1)

00001

159

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