MC68181 Datasheet, PDF(99/119 Page) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

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MC68181 Datasheet, PDF (99/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

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Freescale Semiconductor, Inc.

MC68181

Decoder-to-Host Packet Descriptions

RECEIVED SYSTEM COLLAPSE (RSC)

When SCU is set, this value represents the system collapse value that was received in

the frame.

Receiver Shutdown Packet

The Shutdown Packet is sent in both synchronous and asynchronous mode. It is

designed to indicate to the host that the receiver is turned off and how much time

there is until the FLEX chip will automatically turn it back on.

Byte

Table 2-42 Receiver Shut Down Packet Bit Assignments

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

FNV

TNF7

FCO

CF6

TNF6

NAF6

CF5

TNF5

NAF5

CF4

TNF4

NAF4

CF3

TNF3

NAF3

CF2

TNF2

NAF2

CF1

TNF1

NAF1

Bit 0

CF0

TNF0

NAF0

FRAME NUMBER VALID (FNV)

This bit is set if the last frame info word was correctable and the frame number was

the expected value. When in asynchronous mode, this value will be 0.

CURRENT FRAME (CF)

When in synchronous mode, this is the current frame number. This value is latched

on the negative edge of the READY line when this packet is sent to the host. The

value of this field is valid only if the FLEX chip IC is in synchronous mode and the

FIV bit in the status packet is set. When in asynchronous mode, this value will be 0.

TIME TO NEXT FRAME (TNF)

When in synchronous mode TNF indicates the time to the start of the A-word check if

the FLEX chip IC were to warm up for the next frame. When in asynchronous mode

TNF indicates the time to the start of the next automatic noise detect. See Using the

Receiver Shutdown Packet on page C-12 for an explanation on how to use this

value. This value is latched on the negative edge of the READY line when this packet

is sent to the host.

FRAME CARRIED ON FCO)

This bit is set if the FLEX chip IC is decoding the next frame due to the reception of a

non-zero carry-on value in a previous frame. When in asynchronous mode, this value

will be 0.

MOTOROLA

MC68181 Technical Data Sheet

For More Information On This Product,

Go to: www.freescale.com

B-39

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