AK2548 Datasheet, PDF (19/30 Pages) Asahi Kasei Microsystems – 7 channel E1 Transceiver

ASAHI KASEI
[AK2548]
STATUS REGISTER
Symbol
LOSx
(x=1 to 7)
LOTCx
(x=1 to 7)
LOMC
Description
Loss of signal alarm for channel x. Read only register.
When the loss of signal or the loss of MCLK are detected, LOSx goes High.
Loss of TCLK alarm for channel x. Read only register.
When the loss of TCLKx is detected, LOTCx goes High.
Loss of MCLK alarm. Read only register.
When the loss of MCLK is detected, LOMC and LOSx go High.
MASK CONTROL REGISTER
Symbol
MLOSx
(x=1 to 7)
MLOTCx
(x=1 to 7)
MLOMC
Description
Mask loss of signal alarm for channel x.
MLOSx is active-high to prevent LOSx from setting INT output “high” .
It is possible to read LOSx register regardless of the status of MLOSx.
Initial value is “high”.
Mask loss of TCLK alarm for channel x .
MLOTCx is active-high to prevent LOTCx from setting INT output “high” .
It is possible to read LOTCx register regardless of the status of MLOTCx.
Initial value is “high”.
Mask loss of MCLK alarm.
MLOMC is active-high to prevent LOMC from setting INT output “high” .
It is possible to read LOMC register regardless of the status of MLOMC.
Initial value is “high”.
Note) Please refer to “Loss of MCLK theory of operation”. (P25)
CHANNEL CONTROL REGISTER
Symbol
RLOOPx/
LLOOPx
POLNx
PDx
MSKx
RDEN
TAOSx
ECx
Description
Loopback mode of channel x is activated through the setting of these register
as shown below in Table 1.
TIPx/RINGx output polarity is controlled by this register as shown below in
Table 2. Initial value is “high”.
PDx is active-high to set the corresponding transceiver in power down mode.
TTIPx and TRINGx go “low”. LOSx goes “high” in power down mode.
Initial value is “high”.
MSKx is active-high to prevent LOSx or LOTCx from setting INT output
“high”. Initial value is “high”.
RDEN is active-high to prevent RCLK, RPOS, and RNEG output from
forcing to “low” or “high” by the detection of Loss of signal. Initial value is
“low”.
TAOS is active-high to output all one’s signal from TTIPx and TRINGx.
All one’s signal synchronized with TCLK. When TCLK is lost, the signal
synchronized with MCLK.
Application is selected by this register in Table 3. Initial value is low.
C0028-E-00
19
1999/9