MC68181 Datasheet, PDF(86/119 Page) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

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MC68181 Datasheet, PDF (86/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

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MC68181

Freescale Semiconductor, Inc.

Host-to-Decoder Packet Descriptions

User Address Assignment Packets

The FLEX chip IC has sixteen user address words. Each word can be programmed to

be a short address, part of a long address, or the ï¬rst part of a network ID. The

addresses are configured using the Address Assignment Packets. Each user address

can be configured as long or short and tone-only or regular. Network IDâs are short

and regular. Although the host is allowed to send these packets while the FLEX chip

IC is on, the host must disable the user address word by clearing the corresponding

UAE bit in the User Address Enable Packet before changing any of the bits in the

corresponding User Address Assignment Packet. This method allows for easy

reprogramming of user addresses without disrupting normal operation. The IDs for

these packets range from 128 to 143 (decimal).

Byte

Table B-25 User Address Assignment Packet Bit Assignments

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

TOA

A20

A19

A18

A17

A15

A14

A13

A12

A11

A10

Bit 0

A16

USER ADDRESS WORD NUMBER (a0âa3)

This specifies which address word is being configured. Having all 0s in this field

corresponds to Address Index zero (AI = 0) in the Address Packet received from the

FLEX chip IC when an address is detected. (See Address Packet on page B-29.)

LONG ADDRESS (LA)

When this bit is set, the address is considered a long address. Both words of a long

address must have this bit set. The first word of a long address must have an even

user address word number and the second word must be in the address index

immediately following the first word. Long addresses of the 2â3 and 2â4 set (See

FLEX CAPCODES on page A-21) must be programmed to higher user address word

numbers than long addresses of the 1â2, 1â3, and 1â4 set.

TONE-ONLY ADDRESS (TOA)

When this bit is set, the FLEX chip IC will consider this address a tone-only address

and will not decode a vector word when the address is received. If the TOA bit of a

long address word is set, the TOA bit of the other word of the long address must also

be set.

ADDRESS WORD (A0âA20)

This is the 21 bit value of the address word. Valid FLEX messaging addresses or

Network IDâs may be used.

B-26

MC68181 Technical Data Sheet

For More Information On This Product,

Go to: www.freescale.com

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