PCD5008 datasheet(44/64 Pages) PHILIPS

44 / 64 page

1998 Jun 17

Philips Semiconductors

Product speciﬁcation

FLEX

™ Pager Decoder

PCD5008

8.7.9

BLOCK INFORMATION WORD (BIW) PACKET

(ID = 00H)

The FLEX

™ protocol allows systems to transmit time

information using block information words. The information

carried in a BIW depends on the BIW word format

(Table 49). The first BIW of each phase, carrying

information about the frame structure, is used internally by

the PCD5008 and is never transmitted to the host.

The PCD5008 can be configured to send all time and date

BIWs (BIW001, BIW010 and BIW101) to the host by

setting the SBI bit in the control packet, see Section 8.4.7.

When the SBI bit is set and a BIW is received with an

uncorrectable number of bit errors, the PCD5008 sends

the BIW to the host indicating that the codeword was

received in error (regardless of the BIW word format).

The PCD5008 does not support decoding of vector and

message words associated with the data/system

message BIW101.

System providers supporting local time transmissions are

required to transmit at least one time related BIW in each

phase transmitted in frame 0, cycle 0. The time

transmitted is the local time for the transmitted time zone

and refers to the actual time at the leading edge of the first

bit of sync 1 of frame 0 of the current cycle.

See Tables 50, 51, 52 and 53 and the following bit

definitions of the time related BIWs.

e: error (Table 49). Set if more than 2 bit errors are

detected in the word or if the check character calculation

fails after error correction has been performed.

p: phase (Table 49), is the phase on which the BIW was

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

x: unused bits (Table 49). Their value is not guaranteed.

f: word format type (Table 49). The value of these bits

modify the meaning of the s bits in this packet as described

in Tables 50, 51 and 52. If the e bit is not set, this field is

one of 001, 010 or 101.

s: BIW information bits (Table 49). The definition of these

bits depend on the f bits in this packet.

m: month field (Table 50). 0001 to 1100 binary

correspond to January to December in month order.

d: day field (Table 50). 00001 to 11111 binary correspond

to 1 to 31 days in the month.

Table 49 BIW packet bit assignments

Table 50 Month/day/year BIW deﬁnitions

Table 51 Second/minute/hour BIW deﬁnitions

Table 52 Accurate seconds/daylight savings time/time zone; system message BIW deﬁnitions

Note

1. When the s3s2s1s0 field is 0100 or 0101, then s4 to s13 are defined as above, when the s3s2s1s0 field does not have

one of these values, the system message does not contain time related information and is not sent to the host.

BYTE

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

300000000

s13

s12

s11

s10

0s7

s13

s12

s11

s10

001

s13

s12

s11

s10

011

s13 s12 s11 s10

DESCRIPTION

101

xL0

system message; note 1

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