MC68181 Datasheet, PDF(84/119 Page) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

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MC68181 Datasheet, PDF (84/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

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MC68181

Freescale Semiconductor, Inc.

Host-to-Decoder Packet Descriptions

Frame Assignment Packets

The FLEX protocol defines that each address of a FLEX pager is assigned a home

frame and a battery cycle (see FLEX CAPCODES on page A-24). This information

is determined by the service provider. The FLEX chip IC must be configured so that a

frame that is assigned by one or more of the addressesâ home frames and battery

cycles has its corresponding configuration bit set. For example, if the FLEX chip IC

has one enabled address and it is assigned to frame 3 with a battery cycle of 4, the AF

bits for frames 3, 19, 35, 51, 67, 83, 99, and 115 should be set and the AF bits for all

other frames should be cleared.

When the FLEX chip IC is configured for manual collapse mode by setting the MCM

bit in the Roaming Control Packet, the FLEX chip IC will not apply the received

system collapse to the AF bits. The host should set the AF bits for all frames that

should be decoded on all channels. For example, if frames 0 and 64 should be

decoded on one channel and frames 4, 36, 68, and 100 should be decoded on another

channel, all six of the corresponding AF bits should be set. The host can then change

the receiverâs carrier frequency after the FLEX chip IC decodes frames 0, 36, 64, and

100.

There are 8 Frame Assignment Packets. The Packet IDs for these packets range from

32 to 39 (decimal)

Byte

Table B-22 Frame Assignment Packet Bit Assignments

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1

AF15

AF14

AF13

AF12

AF11

AF10

AF9

AF7

AF6

AF5

AF4

AF3

AF2

AF1

Bit 0

AF8

AF0

FRAME RANGE (f)

This value determines which sixteen frames correspond to the sixteen AF bits in the

packet according to the following table. At least one of these bits must be set when

the FLEX chip IC is turned on by setting the ON bit in the control packet. The value

after reset = 0.

B-24

MC68181 Technical Data Sheet

For More Information On This Product,

Go to: www.freescale.com

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