AK2546 Datasheet, PDF (18/27 Pages) Asahi Kasei Microsystems – 7 channel T1 Transceiver

ASAHI KASEI
[AK2546]
STATUS REGISTER
Symbol
Description
LOSx
(x=1 to 7)
Loss of signal alarm for channel x. Read only register.
When the loss of signal is detected, LOSx is set High.
LOTCx
(x=1 to 7)
Loss of TCLK alarm for channel x. Read only register.
When the loss of TCLKx is detected, LOTCx is set High.
LOMC
Loss of MCLK alarm. Read only register.
When the loss of MCLK is detected, LOMC is set High.
MASK CONTROL
Symbol
Description
MLOSx
(x=1 to 7)
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”.
MLOTCx
(x=1 to 7)
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”.
MLOMC
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”. When the loss of MCLK is detected, LOSx register
and LOSx pins are set “high” at the same time. Therefore all MLOSx
register must be set “high” to prevent loss of MCLK from setting INT
output. In this case, LOMC can be read.
CHANNEL CONTROL REGISTER
Symbol
Description
LENGyx
The generated transmit pulse in channel x provides the appropriate pulse
shape for line length from a DSX-1 cross connect through the setting of this
register as shown below in Table 1.
RLOOPx/
LLOOPx
Loopback mode of channel x is activated through the setting of these
registers as shown below in Table 2.
POLNx
This register as shown in Table 3 controls TIPx/RINGx output polarity.
Initial value is “high”.
PDx
PDx is active-high to set the corresponding transceiver in power down
mode.
The impedance between TTIP and TRING is set to 30kΩ(typ). LOSx goes
“high” in power down mode. Initial value is “high”.
MSKx
MSKx is active-high to prevent LOSx or LOTCx from setting INT output
“high”. Initial value is “high”.
RDEN
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”.
C0019-E-01
18
1999/9