MC68181 Datasheet, PDF (72/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

MC68181
Freescale Semiconductor, Inc.
Host-to-Decoder Packet Descriptions
Table B-8 Phase Select Bit Definition
PS Value
Phase Decoded
(based on FLEX Data Rate)
PS₁ PS_{0 1600 bps 3200 bps 6400 bps}
0
0
a
a
a
0
1
a
a
b
1
0
a
c
c
1
1
a
c
d
SEND BLOCK INFORMATION (SBI) WORDS 2–4
When this bit is set, any errored or time-related block information words 2–4 will be
sent to the host. The value after reset = 0.
MINUTE TIMER CLEAR (MTC)
Setting this bit will cause the one minute timer to restart from 0.
END OF ADDRESSES ENABLE (EAE)
When this bit is set, the EA bit in the Status Packet will be set immediately after FLEX
chip decodes the last address word in the frame if there was any address detected in
the frame. When this bit is cleared, the EA bit will never be set.
TURN ON DECODER (ON)
Set if the FLEX chip IC should be decoding FLEX signals. Clear if signal processing
should be off (very low power mode). If the ON bit is changed twice and the control
packets making the changes are received within 2 ms of each other, FLEX chip may
ignore the double change and stay in its original state (e.g. if it is turned off then on
again within 2 ms it may stay on and ignore the off pulse). Therefore it is
recommended that the host insures a minimum of 2 ms between changes in the ON
bit. The value after reset = 0.
Note: In order to properly turn off the decoder, the following steps must occur:
1. Turn off the FLEX chip by sending a Control Packet with the ON bit cleared.
2. Turn on the FLEX chip by sending a Control Packet with the ON bit set.
3. Turn off the FLEX chip by sending a Control Packet with the ON bit cleared.
Timing between these steps is specified below and is measured from the positive
edge of the last clock of one packet to the positive edge of the last clock of the next
packet:
B-12
MC68181 Technical Data Sheet
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