PCD5008 datasheet(30/64 Pages) PHILIPS

30 / 64 page

1998 Jun 17

Philips Semiconductors

Product speciﬁcation

FLEX

™ Pager Decoder

PCD5008

8.6.5

PHASE AND FRAME CALCULATION

The method for specifying the phase and base frame of a

pager is specified in the CAPCODE type:

• The phase, base frame are extracted by standard rules

from the user address field in the CAPCODE

(CAPCODE types A to L).

• The phase is indicated by the CAPCODE type

(Table 25) and the base frame is specified in the frame

field of the CAPCODE (CAPCODE types U to Z).

For easy allocation of (up to 4) consecutive CAPCODEs

having the same phase and frame, an offset in the

range 0 to 3 is subtracted from the user address for the

purposes of phase and frame extraction. The offset is

determined by the CAPCODE type.

The standard rules for extracting phase and base frame

from the user address are (phase numbers 0 to 3

correspond to phases A to D):

Phase number = ((Address

− Offset) DIV 4) MOD 4

Frame = ((Address

− Offset) DIV 16) MOD 128

where DIV is the integer division and MOD is the

remainder of an integer division.

For a CAPCODE which does not use the standard rules for

extracting phase and base frame

(CAPCODE types U to Z) the 3-digit frame

field 000 to 127 and a single digit decimal pager

collapse 0 to 5 can precede the CAPCODE type. When

these fields are not included, the paging device or the

subscriber database must be accessed to determine the

assigned frame and collapse value.

Table 25 Frame and phase extraction for different CAPCODE types

Note

1. All-phase decoding is not defined in FLEX

™ G1.8 and, therefore, is not supported by the PCD5008.

CAPCODE TYPE

PAGER TYPE

FRAME/PHASE EXTRACTION

single-phase

standard rules; Offset: 0

single-phase

standard rules; Offset: 1

single-phase

standard rules; Offset: 2

single-phase

standard rules; Offset: 3

any-phase

standard rules; Offset: 0

any-phase

standard rules; Offset: 1

any-phase

standard rules; Offset: 2

any-phase

standard rules; Offset: 3

all-phase; note 1

standard rules; Offset: 0

all-phase; note 1

standard rules; Offset: 1

all-phase; note 1

standard rules; Offset: 2

all-phase; note 1

standard rules; Offset: 3

single-phase

no frame extraction rules, phase-A

single-phase

no frame extraction rules, phase-B

single-phase

no frame extraction rules, phase-C

single-phase

no frame extraction rules, phase-D

any-phase

no frame extraction rules, any-phase

all-phase; note 1

no frame extraction rules, all-phase

PCD5008 Datasheet(PDF) 30 Page - NXP Semiconductors

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