参数资料
型号: MC145572
厂商: Motorola, Inc.
英文描述: ISDN U-Interface Transceiver(ISDN U接口收发器)
中文描述: 综合业务数字网U型接口收发器(综合业务数字网ü接口收发器)
文件页数: 44/264页
文件大小: 2832K
代理商: MC145572
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MC145572
4–8
MOTOROLA
Register NR2 contains activation/deactivation control bits. All bits are cleared on Software Reset
(NR0(b3)) or Hardware Reset (RESET).
CAUTION
NR2 normally is not written to in GCI mode; if necessary, NR2 can be written to, but bits
b3 and b2 should always be written as 0 while the device is in GCI mode.
b3
b2
b1
b0
NR2
Activation Request
Deactivation Request
Superframe Update
Disable
Customer Enable
rw
rw
rw
rw
Activation Request
When this bit is set to 1 and the U–interface transceiver is in ANSI T1.601–1992 defined “Full Reset”,
the transceiver will begin an activation. The external microcontroller never needs to set this bit to 0.
The bit is internally set to 0 whenever Transparent/Activation in Progress (NR1(b0)) is set to a 1, when-
ever TL is transmitted in the LT mode, or on hardware or software reset. If the activation fails for any
reason, the Activation Request bit must be set to 1 once again to initiate another activation attempt.
The transceiver self–activates if an incoming tone is detected when in LT or NT mode. Once activation
starts, the MC145572 automatically clears this bit. Do not continuously reassert this bit. It only needs
to be set once per activation attempt.
Deactivation Request
When this bit is set to 1 in the LT mode; upon reaching Linkup = 1, the U–interface transceiver will
halt transmission and proceed to ANSI T1.601 defined “Tear Down” state H10 or J10, following three
complete superframes. The deactivation sequence can be aborted if the Deactivate Request bit is
set back to 0 prior to completion of three transmitted superframes. In NT mode, the Deactivate Request
bit is set to a 1 by the external microcontroller in response to a received
dea
bit on the M4 channel,
which indicates to the U–interface transceiver that this is a normal deactivation attempt. In this case,
the MC145572 will reactivate in the warm start mode. In NT mode, the MC145572 automatically clears
this bit upon deactivation. In LT mode, this bit is not cleared prior to starting the next activation and
must be cleared when the MC145572 is deactivated.
Superframe Update Disable
This bit tells the Superframe Framer whether or not to update the maintenance bits M40 – M47, M50,
M51, and M60, which are being transmitted with the new bits that have been loaded in the control
registers. In normal operation, this bit is always set to 0, allowing the transmitted bits to be updated
at the transmit superframe boundary with the maintenance channel data in registers BR0 and
BR2(b7:b4). The exception to this is during a deactivation in the LT mode. The transceiver can be
forced to send exactly three superframes of updated M4 channel data before it deactivates. In that
sequence of operations, the Superframe Update Disable bit is first set to 1. The M4 maintenance
bits are then written by the external microcontroller to the proper setting for deactivation. The Super-
frame Update Disable bit is set to a 0 and the Deactivate Request bit in NR2(b2) is set to a 1 by
the external microcontroller. This guarantees that the U–interface transceiver will send exactly three
superframes of updated M4 data before the activation state controller shuts everything down. Note
that Superframe Update Disable does not affect the transmitted eoc,
febe
, or
crc
maintenance bits.
Customer Enable
When this bit is set to 1, it permits the U–interface transceiver to pass 2B+D data transparently. During
the activation procedure, the Customer Enable bit normally is set to 0. Only after the U–interface trans-
ceiver has reached full–duplex operation and the
act
bits of the M4 maintenance channel have been
properly exchanged, should the Customer Enable bit be set to a 1. See BR9(b5:b4), M4 Control Bits,
for another way to achieve 2B+D data transparency.
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