MC68181 Datasheet, PDF (98/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

MC68181
Freescale Semiconductor, Inc.
Decoder-to-Host Packet Descriptions
MISSED ADDRESS WORD (MAW)
This bit is set when any address words in the address field is received with an
uncorrectable number of errors and FLEX chip was configured to report missed
frame information via the MFC bit in the roaming control packet. This bit is set no
more than once per frame regardless of the number of address words in the frame.
This bit is cleared when read.
NETWORK BIT UPDATE (NBU)
This bit is set when the NBC bit in the roaming control packet is set and a frame
information word is received with a correctable number of errors. This bit will not be
set when the frame information word is not received due to missing the first
synchronization pattern (A / A). This bit is cleared when read.
NETWORK BIT VALUE (n)
When NBU is set, this is the value of the n bit in the last received frame information
word.
NOISE DETECT RESULT (NDR)
These bits indicate the result of a noise detect. The results of noise detects initiated by
setting the SND bit in the roaming control packet will always be reported. The results
of the automatic noise detects performed in asynchronous mode will only be
reported if the RND bit is set in the roaming control packet. When continuous noise
detects during block data are enabled by setting the CND bit in the roaming control
packet, only the “No FLEX signal detected” result will be reported. These bits are
cleared when read.
Table 2-41 Noise Detect Result Bit Settings
NDR
Noise Detect Result
00
No Information
01
Noise Detect was abandoned
10
FLEX signal detected
11
FLEX signal not detected
SYSTEM COLLAPSE UPDATE (SCU)
This bit is set when the FLEX chip IC is configured for manual collapse mode by
setting the MCM bit in the roaming control packet and the system collapse of a frame
is received. This bit is set no more than once per frame regardless of the number of
phases in the frame. This bit will not be set in frames in which no block information
word ones is received properly. This bit is cleared when read.
B-38
MC68181 Technical Data Sheet
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