PCD5008 Datasheet, PDF (30/64 Pages) NXP Semiconductors – FLEX Pager Decoder

Philips Semiconductors
FLEX™ Pager Decoder
Product specification
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
CAPCODE TYPE
A
B
C
D
E
F
G
H
I
J
K
L
U
V
W
X
Y
Z
PAGER TYPE
single-phase
single-phase
single-phase
single-phase
any-phase
any-phase
any-phase
any-phase
all-phase; note 1
all-phase; note 1
all-phase; note 1
all-phase; note 1
single-phase
single-phase
single-phase
single-phase
any-phase
all-phase; note 1
FRAME/PHASE EXTRACTION
standard rules; Offset: 0
standard rules; Offset: 1
standard rules; Offset: 2
standard rules; Offset: 3
standard rules; Offset: 0
standard rules; Offset: 1
standard rules; Offset: 2
standard rules; Offset: 3
standard rules; Offset: 0
standard rules; Offset: 1
standard rules; Offset: 2
standard rules; Offset: 3
no frame extraction rules, phase-A
no frame extraction rules, phase-B
no frame extraction rules, phase-C
no frame extraction rules, phase-D
no frame extraction rules, any-phase
no frame extraction rules, all-phase
Note
1. All-phase decoding is not defined in FLEX™ G1.8 and, therefore, is not supported by the PCD5008.
1998 Jun 17
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