PCD5008 datasheet(29/64 Pages) PHILIPS

29 / 64 page

1998 Jun 17

Philips Semiconductors

Product speciﬁcation

FLEX

™ Pager Decoder

PCD5008

8.6.4

ADDRESS CALCULATION

Address codeword values generally do not coincide with

(part of) the user address as specified in the CAPCODE.

To find the address codewords corresponding to a user

address a conversion has to be done (Table 24). The type

of conversion depends on the CAPCODE range in which

the user address is located. Note that addresses are

transmitted LSB first (differently to POCSAG).

Short addresses, are transmitted in a single address

codeword where as long addresses are transmitted in two

consecutive address codewords. The first codeword of a

long address contains the lower part of the address, the

second codeword the upper part. By combining two long

address codewords from different banks 6 long address

ranges are created: 1 to 2, 1 to 3, 1 to 4, 2 to 3, 2 to 4 and

3 to 4. Ranges 2 to 4 and 3 to 4 are as yet undefined and

reserved.

Table 24 describes how to calculate the 21 bit address

codeword which is transmitted over the air.

Table 23 Address word range deﬁnitions

TYPE

HEX VALUE

Idle word (illegal address)

000000

Long address 1

000001 to 008000

Short address

008001 to 1E0000

Long address 3

1E0001 to 1E8000

Long address 4

1E8001 to 1F0000

Short address (reserved)

1F0001 to 1F27FF

Information service address

1F2800 to 1F67FF

Network address

1F6800 to 1F77FF

Temporary address

1F7800 to 1F780F

Operator messaging address 1F7810 to 1F781F

Short address (reserved)

1F7820 to 1F7FFE

Long address 2

1F7FFF to 1FFFFE

Idle word (illegal address)

1FFFFF

Table 24 Address word calculation

Notes

1. All numbers are in hexadecimal format.

2. The MOD operator gives the remainder of an integer division.

3. CAPCODE refers to the value of the address field in a FLEX

™ CAPCODE.

4. The DIV operator is the integer division.

5. A short address consists of a single codeword.

6. The upper codeword range in bank 2 is used from the highest address downwards, i.e. the lowest value of the

CAPCODE produces a codeword value of 1FFFFEH.

TYPE

LOWER ADDRESS CODEWORD;

notes 1, 2 and 3

UPPER ADDRESS CODEWORD;

notes 1, 3 and 4

Short address

CAPCODE + 8000

note 5

Long address,

range 1 to 2; note 6

1 + ((CAPCODE

− 1F9001) MOD 8000)

1FFFFF

− ((CAPCODE − 1F9001) DIV 8000)

Long address,

ranges 1 to 3 and

1to4

1 + ((CAPCODE

− 1F9001) MOD 8000)

1D8000 + ((CAPCODE

− 1F9001) DIV 8000)

Long address,

range 2 to 3

1F7FFF + ((CAPCODE

− 1F8FFF) MOD 8000) 1C8000 + ((CAPCODE − 1F8FFF) DIV 8000)

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