Preliminary Information
MT9075B
Bit
Name
Functional Description
Bit
Name
Functional Description
CNTCLR
(0)
2
Counter Clear. If one, all status
counters are cleared and held low.
Zero for normal operation.
7
SYNI
(0)
Synchronization Interrupt. When
unmasked (SYNI = 0) an interrupt is
initiated when a loss of basic frame
synchronization condition exists.
Interrupt vector = 10000000.
1
MSN
(0)
Most
Nibble. If one, the CSTo and CSTi
channel associated signalling
Significant
Signalling
6
5
4
3
2
1
RAII
(0)
Remote
Alarm
Indication
Interrupt. When unmasked (RAII
= 0) a received RAI will initiate an
nibbles will be valid in the most
significant portion of each ST-BUS
time slot. If zero, the CSTo and
CSTi channel associated signalling
nibbles will be valid in the least
significant portion of each ST-BUS
time slot.
interrupt.
Interrupt
vector
=
01000000.
AISI
(0)
Alarm Indication Signal Interrupt.
When unmasked (AISI = 0) a
received AIS will initiate an
interrupt.
Interrupt
vector
=
64KCCS
(0)
0
64 Kbits/s Common Channel
Signalling. If one, common channel
signalling information is sourced
from CSTi, and common channel
signalling information is clocked out
of CSTo. The transmit clock is an
internal clock. This 64 KHz clock is
divided down from C4b and is
synchronous with the STBUS
channel boundaries. The rising
edges of the clock occur between
channels 1 and 2; 5 and 6; 9 and
10; 13 and 14; 17 and 18; 21 and
22; 25 and 26; 29 and 30. The
receive clock is synchronous with
the same channel times, but derived
from the extracted clock timebase.
The CCS receive clock is driven out
on Rx64KCK (pin 47 in PLCC, 35 in
MQFP) when this bit is set. If zero
CSTi and CSTo have 2.048 mb/s bit
rates and operate as per Tables 66
to 71.
01000000.
AIS16I Channel 16 Alarm Indication
Signal Interrupt. When unmasked
(AIS16I = 0), a received AIS16 will
initiate an interrupt. Interrupt vector
= 01000000.
(0)
LOSI
(0)
Loss of Signal Interrupt. When
unmasked (LOSI = 0) an interrupt is
initiated when a loss of signal
condition exists. Interrupt vector =
01000000.
FERI
(0)
Frame Error Interrupt. When
unmasked (FERI = 0), an interrupt
is initiated when an error in the
frame alignment signal occurs.
Interrupt vector = 00100000.
BPVO Bipolar
Violation
Interrupt.
Counter
Overflow
When
(0)
unmasked (BPVO = 0), an interrupt
is initiated when the bipolar violation
error counter changes form FFFFH
to 0H. Interrupt vector = 00010000.
Table 21 - Interrupt, Signalling and BERT
Control Word (Page 01H, Address 1AH)
0
SLPI
(0)
SLIP Interrupt. When unmasked
(SLPI = 0), an interrupt is initiated
when a controlled frame slip occurs.
Interrupt vector = 00000100.
Table 22 - Interrupt Mask Word Zero
(Page 01H, Address 1BH)
35
MITEL [ MITEL NETWORKS CORPORATION ]
