PCD5008 datasheet(33/64 Pages) PHILIPS

33 / 64 page

1998 Jun 17

Philips Semiconductors

Product speciﬁcation

FLEX

™ Pager Decoder

PCD5008

8.7

Call data packets

8.7.1

GENERAL

The PCD5008 sends data extracted from the

FLEX

™ signal to the host in SPI packets using the

following packet types:

• BIW packets which contain data transmitted in BIWs

• Address packets which indicate that a call has been

detected and give additional information about call

attributes

• Vector packets which indicate the call type and indicate

which message word numbers (WN) are associated

with the call

• Message packets which contain the information

contained within the message codewords of a call.

For more information about the function of these packets

within the FLEX

™ datastream see Section 8.8.

8.7.2

ADDRESS PACKET (ID = 01H)

Information from address codewords in received calls is

sent to the host in address packets. If less than 3 bit errors

are detected in a received address word and it matches an

enabled address assigned to the PCD5008, the address

packet is sent to the host processor. The address packet

contains the call address, the location in the datastream of

the associated vector, and other miscellaneous call data.

PA: priority address (Table 30). This bit is set if the

address was received as a priority address.

p: phase (Table 30). This is the phase on which the

address was detected (0 = A,1=B,2=Cand3=D).

LA: long address (Table 30). This bit is set if the address

was programmed in the PCD5008 as a LA.

AI: address index (Table 30). This index identifies which

address was detected. Valid values are 00H to 0FH,

corresponding to the 16 programmable address words

and 80H to 8FH, corresponding to the 16 temporary

addresses (Section 8.8.4). For long addresses, the

address packet is only sent once with AI referring to the

second word of the address.

TOA: tone-only address (Table 30). Set this bit if the

address was programmed in the PCD5008 as a tone-only

address. No vector word is sent for tone-only addresses.

WN: word number of vector (2 to 87 decimal) (Table 30).

The location of the vector within this frame for the detected

address. This value is invalid for this packet if the TOA bit

is set.

x: unused bits (Table 30). The value of these bits is not

guaranteed.

8.7.3

VECTOR PACKETS (ID = 02H TO 57H)

Information from vector codewords in received calls is sent

to the host in vector packets. For any address packet sent

to the host (except tone-only addresses), a corresponding

vector packet is always sent.

The ID of the vector packet is the word number where the

vector word was received in the frame. The host must

associate vector packets with a call by searching for an

address packet previously received on the same phase

and with WN bits which match the ID of the vector packet.

The vector type of a vector packet indicates the format of

a call as one of:

• Numeric (3 types)

• Short message/tone-only

• Hex/binary

• Alphanumeric

• Secure message

• Short instruction.

The numeric, hex/binary, alphanumeric, and secure

message vector packets indicate the location and number

of message word packets in the message field. If more

than two bit errors are detected in the vector word (via

BCH calculations, parity calculations, check character

calculations, or value validation) the e bit is set and the

message words are not sent.

Table 30 Address packet bit assignments

BYTE

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

300000001

2PA

xxxx

1AI7

AI6

AI5

AI4

AI3

AI2

AI1

AI0

TOA

WN6

WN5

WN4

WN3

WN2

WN1

WN0

PCD5008 Datasheet(PDF) 33 Page - NXP Semiconductors

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