參數(shù)資料
型號(hào): MC145572
廠商: Motorola, Inc.
英文描述: ISDN U-Interface Transceiver(ISDN U接口收發(fā)器)
中文描述: 綜合業(yè)務(wù)數(shù)字網(wǎng)U型接口收發(fā)器(綜合業(yè)務(wù)數(shù)字網(wǎng)ü接口收發(fā)器)
文件頁(yè)數(shù): 69/264頁(yè)
文件大?。?/td> 2832K
代理商: MC145572
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MC145572
4–33
MOTOROLA
Internal Analog Loopback
When this bit is set to 1, the analog loopback path is inside the MC145572. Default after any reset
is 0 or external analog loopback path.
Line Connect
When this bit is 1, the U–interface line can remain connected during analog loopbacks. When this
bit is 0, the line must be disconnected. Default after any reset is 0.
TSEN DCH Enable
This bit enables TSEN when D channel data is present on the Dout or DCHout pins. When the
timeslot assigner is enabled, the TSEN signal is active during the timeslot which D channel data is
transferred.
IDL2 Rate 2
In the IDL2 mode, when IDL2 rate 2 is set to 1, the IDL2 clock (DCL) rate is 512 kHz. IDL2 clock
speed (see Register BR7) is ignored when this bit is set to 1. In full GCI mode, as a master in the
NT mode, the DCL clock rate is selected using the pin input (see CLKSEL description in
Section 3.3.4
).
This bit also sets the clock frequency on FREQREF or FREFout when in NT Slave mode.
IDL2 Long Frame Mode
While operating as an IDL2 master, this bit controls whether the FSR and FSX operate in Long Frame
or Short Frame mode. If this bit is 1, both FSR and FSX operate in Long Frame mode. As an IDL2
slave, the MC145572 determines the mode based on the length of FSR. See
Section 5.4.2.
crc
Corrupt Mode
This bit changes the operating mode of the input control bit
crc
Corrupt in register BR8. When
crc
Corrupt mode is set to 1, the
crc
Corrupt input is used to only corrupt one outgoing superframe
crc
.
When
crc
Corrupt mode is set to 0, the
crc
Corrupt behaves as it did in the MC145472, unaligned
to the transmit superframe, and continues to affect the
crc
data until explicitly reset.
febe
/
nebe
Rollover
This bit changes the operating mode of the
febe
and
nebe
counter registers BR4 and BR5. When
febe
/
nebe
rollover is set to 1, the
febe
and
nebe
counter registers do not saturate at all 1s, but
instead, rollover from $FF to $00. When
febe
/
nebe
rollover is set to 0, the
febe
and
nebe
counter
registers behave just as they do in the MC145472.
M4 Trinal Mode
This bit changes the operating mode of the persistence checking performed on the
act
,
dea
,
sai
,
and
uoa
bits in the deframer. When M4 Trinal mode is set to 1, the checked M4 bits must be valid
for three consecutive superframes before asserting Verified
act
, or Verified
dea
, etc. When M4 Trinal
mode is set to 0, the checked M4 bits behave as they did in the MC145472, only checking them as
configured in BR9(b5,b4). When operating in full GCI mode, the MC145572 performs trinal checks
on the received M4 channel
act
,
dea
,
sai
, and
uoa
bits (see Table 4–11).
This register is used to control the dump/restore operation, SFAX and SFAR outputs, and three–state
enable for off–chip bus drivers. After a hardware or software reset, all bits default to 0 to maintain
MC145472/MC14LC5472 compatibility.
b7
D/R
Mode 1
b6
D/R
Mode 0
b5
b4
b3
b2
b1
b0
OR8
SFAX
Output
Enable
FREQREF
Output
Enable
TSEN
BCH
Enable
Reserved
SFAX/
SFAR
Enable
D Channel
Port
Enable
rw
rw
rw
rw
rw
rw
rw
rw
CAUTION
Reserved bit b2 must be set to 0 at all times.
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