MC145572AE Freescale Semiconductor, MC145572AE Datasheet - Page 116
MC145572AE
Manufacturer Part Number
MC145572AE
Description
Manufacturer
Freescale Semiconductor
Datasheet
1.MC145572AE.pdf
(264 pages)
Specifications of MC145572AE
Number Of Line Interfaces
1
Control Interface
HDLC
Lead Free Status / Rohs Status
Compliant
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6.11.2
Indication of Transmit States and Repeater Applications
BR8(b7:b4), Frame State 3 through Frame State 0, indicates the current state of the Superframe
Framer. In a U–interface repeater, it may be necessary to have NT continue transmitting SN2 until
LT–configured MC145572 receives SN3. Software must monitor the transmit state at least once every
millisecond to determine when NT starts transmitting SN2. When start of SN2 transmission is de-
tected, write $A to BR8(b7:b4) to hold the transmit framer in SN2. Once LT indicates full activation, the
transmit framer can be allowed to proceed to SN3 by writing $0 to BR8(b7:b4).
It may also be necessary to disable the 15–second activation timer in repeater applications. This is
done by setting Activation Timer Disable (BR11(b0)) to a 1 prior to initiating activation or when Activation
in Progress, NR1 = $1, is detected.
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MC145572
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