MC145572PB Freescale Semiconductor, MC145572PB Datasheet - Page 116

• Manufacturer Part Number: MC145572PB
• Manufacturer: Freescale Semiconductor

Specifications of MC145572PB

• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / Rohs Status: Not Compliant

Freescale Semiconductor, Inc.
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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