Preliminary Information
MT9075B
Bit
Name
Functional Description
Bit
Name
Functional Description
2
T1I
(0)
T1 Timer Interrupt. When
unmasked (T1I = 1), an interrupt is
initiated when the T1 timer bit (page
03H, address 12H, bit 5) changes
from zero to one. Interrupt vector =
00001000.
2
BEROI Bit Error Counter Overflow
Interrupt. When unmasked (BERO
= 1), an interrupt is initiated when
the bit error counter overflows.
Interrupt vector = 00010000.
(0)
1
0
AUXPI Auxiliary Pattern Interrupt. When
1
0
T2I
(0)
T2 Timer Interrupt. When
unmasked (T2I = 1), an interrupt is
initiated when the T2 timer bit (page
03H, address 12H, bit 4) changes
from zero to one. Interrupt vector =
00001000.
unmasked (AUXPI = 1), an interrupt
is initiated when the AUXP status bit
of page 03H, address 15H goes
high. Interrupt vector = 01000000.
(0)
CMFOI Receive
CRC-4
Multiframe
Counter Overflow Interrupt. When
unmasked (CMFO = 1), an interrupt
is initiated when the CRC-4
(0)
- - -
Unused
Table 25: Interrupt Mask Word Three
(Page 01H, Address 1EH)
multiframe
counter
overflows.
Interrupt vector = 00010000.
Table 24 - Interrupt Mask Word Two
(Page 01H, Address 1DH)
Bit Name
Functional Description
7-4
---
Unused. Set low for normal operation.
Bit
Name
Functional Description
Multiframe Synchronization
(0000)
7
MFSYI
(0)
3
CTXP Custom Transmit Pulse Level. A
Interrupt. When unmasked
zero means that the transmit pulse
level is determined by the bits TX2-0
listed in the table entry below. When
CPL is a one, the pulse level is
(0)
(MFSYI = 1), an interrupt is initiated
when multiframe synchronization is
lost. Interrupt vector = 10000000.
determined
programmed in registers 1CH - 1Fh on
Page 2.
by
coefficients
6
CSYNI
(0)
CRC-4
Multiframe
Synchronization Interrupt. When
unmasked(CSYNI=1), aninterrupt
is initiated when CRC-4 multiframe
synchronization is lost. Interrupt
vector = 10000000.
2-0 TX2-0 Transmit pulse amplitude. Select the
TX2-TX0 bits according to the line
type, value of termination resistors
(0)
(R ), and transformer turns ratio used
T
5
4
- - -
Unused.
TX2 TX1 TX0 Line(Ω) R (Ω) Xfmr
T
YI
Remote Signalling Multiframe
Alarm Interrupt. When unmasked
(YI = 1), an interrupt is initiated
when
multiframe
0
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
120
120
120
0
1:2
1:1
1:2
1:2
1:2
1:1
1:2
1:2
(0)
0
0
0*
0
15
a
remote
alarm
signalling
120/75 12.1
signal
is
=
received. Interrupt vector
10000000.
1
75
75
75
0
1
0
1*
1
9.1
3
1SECI
(0)
One Second Status Interrupt.
When unmasked (1SECI = 1), an
interrupt is initiated when the
1SEC status bit (page 03H,
address 12H, bit 7) changes from
zero to one. Interrupt vector =
00001000.
75/120 12.1
*These configurations provide the best
matching characteristics.
Table 26: Transmit Pulse Control Word
(Page 01H, Address 1FH)
Table 25: Interrupt Mask Word Three
(Page 01H, Address 1EH)
37
MITEL [ MITEL NETWORKS CORPORATION ]
