PCD5008 datasheet(38/64 Pages) PHILIPS

38 / 64 page

1998 Jun 17

Philips Semiconductors

Product speciﬁcation

FLEX

™ Pager Decoder

PCD5008

8.7.8

MESSAGE PACKETS (ID = 03H TO 57H)

8.7.8.1

General

The message field follows the vector field in the FLEX

™

protocol. It contains the message data, checksum

information, and may contain fragment and message

numbers (Sections 8.8.7 and 8.8.5). If the error bit of a

vector word is not set and the vector word indicates that

there are message words associated with the page, the

message words are sent in message packets to the host.

The ID of the message packet is the word number where

the message word was received in the frame.

WN: word number of message word (3 to 87 decimal)

(Table 40). WN describes the location of the message

word in the frame.

e: error (Table 40). Set if more than 2 bit errors are

detected in the word.

p: phase (Table 40). This is the phase on which the vector

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

i: these are the information bits of the message word

(Table 40). The definition of these i bits depends on the

vector type and which word of the message is being

received.

8.7.8.2

Numeric Message

FLEX

™ numeric messages are encoded using the

4-bit BCD encoded characters sets described in Table 39.

Characters are placed in codewords along with additional

information about the message as described in

Tables 41 and 42 and the following definitions. The 4-bit

numeric characters of the message are designated as

letters a, b, c, d, ... z, A, B etc.

Only codewords containing the numeric message are to

be transmitted. The space character CH is used to fill any

unused 4-bit characters in the last word and zeros to fill

any remaining partial characters. The checksum includes

only the codewords comprising the shortened message,

along with the space and fill characters used to fill in the

last word.

Table 39 Standard and alternate numeric character sets;

Peoples Republic of China (ROC) option ‘on’

and ‘off’

CHARACTER

ROC ‘on’

ROC ‘off’

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

Spare

1011

1100

Space

1101

−

1110

]

1111

[

Table 40 Message packet bit assignments

BYTE

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

WN6

WN5

WN4

WN3

WN2

WN1

WN0

i20

i19

i18

i17

i16

1i15

i14

i13

i12

i11

i10

0i7

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