PCD5008 datasheet(48/64 Pages) PHILIPS

48 / 64 page

1998 Jun 17

Philips Semiconductors

Product speciﬁcation

FLEX

™ Pager Decoder

PCD5008

8.8.2

MESSAGE BUILDING

The PCD5008 sends data from the FLEX

™ signal to the

host in packets. Data is transmitted one block at a time,

and one phase at a time. For a 2 phase transmission,

information in block 0 phase-A is converted into packets

and sent to the host, then information in block 0 phase-C

is sent to the host followed by information in

block 1 phase-A and then information in block 1 phase-C

etc. Codewords for different calls may therefore be

interleaved, so the host must use the phase and word

number embedded in each packet to associate that packet

with a particular call.

The phase and word number of the vector packet provides

a unique key which allows the host to associate all the data

for a particular call within a frame. The host must then use

information embedded in the vector word to calculate what

message word locations are associated with the vector.

Tables 54 and 55 show an example of receiving three

messages (possibly portions of fragmented or group

messages), and two BIW packets in the first two blocks of

a 2 phase 3200 bps FLEX

™ frame in case of an

any-phase pager. Table 54 shows the block number, word

number and word content of both phase-A and phase-C

(subscripts indicate the call number). In a 6400 bps

FLEX

™ frame, there would be four phases: A, B, C and D;

in a 1600 bps signal there would be only phase-A.

Table 55 shows the sequence of packets transmitted to

the host.

Table 54 FLEX

™ transmission sequence

Notes

1. Phases begin with BIW1, which is not sent to the host.

2. Codewords not addressed to the pager.

3. Vector for long address indicates the location of the

second and third message words.

4. For long addresses, the first message word

immediately follows the vector.

BLOCK

WORD

PHASE-A

PHASE-C

BIW1; note 1

addr; note 2

BIW

addr; note 2

BIW

addr1

addr; note 2

addr2

addr; note 2

vect; note 2

long addr3 (cw 1)

vect; note 2

long addr3 (cw 2)

vect1

addr; note 2

vect2

vect; note 2

mess1 (cw 1)

vect; note 2

mess1 (cw 2)

vect3; note 3

mess1 (cw 3)

mess3 (cw 1);

note 4

mess2 (cw 1)

mess; note 2

mess2 (cw 2)

mess; note 2

mess2 (cw 3)

mess3 (cw 2)

mess2 (cw 4)

mess3 (cw 3)

Table 55 PCD5008 packet sequence

Notes

1. Word number in an address is that of the

corresponding vector.

2. BIW sent if BIW reception enabled by SBI bit in the

control packet.

PACKET PHASE

PACKET

TYPE

WORD

NO.

COMMENT

address

note 1

address

note 1

vector

pointer to

phase-A

word 9

BIW

n.a.

note 2

BIW

n.a.

note 2

long

address

note 1

vector

pointer to

phase-A

word 12

message

mess1 (cw 1)

message

mess1 (cw 2)

message

mess1 (cw 3)

message

mess2 (cw 1)

message

mess2 (cw 2)

message

mess2 (cw 3)

message

mess2 (cw 4)

vector

pointer to

phase-A

word 14

message

mess3 (cw 1)

message

mess3 (cw 2)

message

mess3 (cw 3)

PCD5008 Datasheet(PDF) 48 Page - NXP Semiconductors

PCD5008 Datasheet(HTML) 48 Page - NXP Semiconductors

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