PCD5008 datasheet(24/64 Pages) PHILIPS

24 / 64 page

1998 Jun 17

Philips Semiconductors

Product speciﬁcation

FLEX

™ Pager Decoder

PCD5008

8.5.6

ACTIVE RECEIVER STATES

8.5.6.1

General

In addition to the warm-up and shut-down states, the PCD5008 has four active receiver states. When these settings are

applied to the receiver control lines, the PCD5008 is decoding the EXTS1 and EXTS0 input signals. The timing of these

signals and their duration depends on the FLEX

™ data stream. Because of this, there is no time setting associated with

these settings (with the exception of the 3200 sps sync setting).

The four settings are as follows:

1600 sps sync setting: applied when the PCD5008 searches for a 1600 sps signal.

3200 sps sync setting: applied when the PCD5008 searches for a 3200 sps signal.

1600 sps data setting: applied after the PCD5008 has found the C or C sync word in the sync 2 section of a

1600 sps frame.

3200 sps data setting: applied after the PCD5008 has found the C or C sync word in the sync 2 section of a

3200 sps frame.

Figure 14 shows some examples of how these settings are used in the PCD5008.

Fig.14 Examples of receiver control transitions.

handbook, full pagewidth

MGK268

receiver

control

line setting

example #1

frame

info

block 10

block 0

possible

LOBAT

check

possible

LOBAT

check

possible

LOBAT

check

1600 sps data or 3200 sps data

or last used warm up setting

1600 sps

sync setting

sync 1

sync 2

3200 sps

data setting

3200 sps

sync setting

receiver

control

line setting

example #2

possible

LOBAT

check

possible

LOBAT

check

1600 sps data or 3200 sps data

or last used warm up setting

1600 sps

sync setting

1600 sps

data setting

FLEXTM

signal

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