PCD5013H/F1 데이터 시트보기 (PDF) - Philips Electronics

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PCD5013H/F1

FLEX™roaming decoder II

Philips Electronics 

Philips Semiconductors

FLEX™ roaming decoder II

Product specification

PCD5013

8.5.5 RECEIVER WARM-UP SEQUENCES

8.5.5.1 Normal receiver warm-up sequence

The PCD5013 allows for up to 6 steps associated with

warming-up the receiver. When the PCD5013 turns on the

receiver while decoding, it starts the warm-up sequence

160 ms before it requires valid signals at the EXTS1 and

EXTS0 input pins.

1. The PCD5013 leaves the receiver control lines in the

off state for the programmed warm-up off time.

2. The first warm-up setting, if enabled, is applied to the

receiver control lines for the amount of time

programmed for that setting.

3. Subsequent warm-up settings are applied to the

receiver control lines for their corresponding time until

a disabled warm-up setting is found.

4. At the end of the last used warm-up setting, the

1600 symbols per second (sps) sync setting or the

3200 sps sync setting is applied to the receiver control

lines depending on the PCD5013 current state.

The PCD5013 must be configured such that the sum of all

of the used warm-up times and the warm-up off time does

not exceed 160 ms. If it exceeds 160 ms, the PCD5013

executes the receiver shut-down sequence 160 ms after

the start of the warm-up off time. If the sum of all of the

used warm-up times and the warm-up off times is less than

160 ms, the receiver remains in the 1600 sps sync setting

or the 3200 sps sync setting from the end of the last used

warm-up setting until valid signals are expected (160 ms

after the start of the warm-up off time). Figure 12 shows

the receiver warm-up sequence while decoding, when all

warm-up settings are enabled.

8.5.5.2 Host initiated receiver warm-up sequence

A host can initiate a receiver warm-up sequence is by one

of the following actions:

• Turning on the PCD5013 by setting the ON bit in the

control packet

• Requesting a noise detect by setting the SND bit in the

roaming control packet

• Requesting an A-word search by setting the SAS bit in

the roaming control packet.

A host initiated receiver warm-up sequence (see Fig.13)

differs from the sequence described in Section 8.5.5.1.

No receiver warm-up off time is applied, instead the

PCD5013 immediately begins to apply the receiver

warm-up settings. Once a disabled warm-up setting is

found, the “3200 sps sync setting” (for ON and SND

warm-ups) or the “1600 sps sync setting” (for SAS

warm-ups) is applied to the receiver control lines.

The decoder then expects valid signals after the 3200 sps

sync warm-up time.

handbook, full pagewidth

receiver

control

line setting

warm-up

off time

off

warm-up

time 1

warm-up

setting 1

warm-up

time 2

warm-up

setting 2

160 ms

warm-up

time 3

warm-up

setting 3

warm-up

time 4

warm-up

setting 4

warm-up

time 5

warm-up

setting 5

1600 sps or 3200 sps

sync setting

possible

LOBAT

check

possible

LOBAT

check

possible

LOBAT

check

possible

LOBAT

check

possible

LOBAT

check

possible

LOBAT

check

Fig.12 Receiver warm-up sequence while decoding.

EXTS1 & EXTS0

signals are expected

to be valid here

MGK265

handbook, full pagewidth

receiver

control

line setting

warm-up

time 1

warm-up

time 2

warm-up

time 3

warm-up

time 4

warm-up

time 5

3200 sps sync

warm-up

time

off

warm-up

setting 1

warm-up

setting 2

warm-up

setting 3

warm-up

setting 4

warm-up

setting 5

3200 sps

sync setting

possible

LOBAT

check

possible

LOBAT

check

possible

LOBAT

check

possible

LOBAT

check

possible

LOBAT

check

possible

LOBAT

check

Fig.13 First receiver warm-up sequence after turning decoding on.

EXTS1 & EXTS0

signals are expected

to be valid here

MGK266

1999 Apr 12

29

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