MT9079
channel positions of the ST-BUS and PCM 30
interface. See Tables 13, 14, 16 and 17 for CAS bit
positions in CSTo1 and CSTi2.
Reset Operation (Initialization)
The MT9079 can be reset using the hardware
RESET pin (see pin description for external reset
circuit requirements) or the software reset bit RST
(page 1, address 11H). During the reset state, TxA
and TxB are low. When the device emerges from its
reset state it will begin to function with the default
settings described in Table 3.
31
31
31
31
31
30
29
28
27
26
15
30
9
24
10
25
11
26
12
27
13
28
14
29
30
30
29
28
27
26
29
30
28
29
27
28
26
27
26
Figure 4a - Relationship between Input DSTi Channels and Transmitted PCM 30 Timeslots
26
27
28
29
30
Figure 4b - Relationship between Received PCM 30 Timeslots and Output DSTo Channels
25
25
25
25
25
22
22
22
21
21
21
20
20
20
19
19
19
18
18
18
17
17
17
16
CSS
15
15
15
15
14
14
14
14
13
13
13
13
CRC Interworking
Code Insert/Detect
Signalling
ABCD Bit Debounce
Activated
Deactivated
CAS (CSTi2 & CSTo1)
Deactivated
Interrupt Mask Word Zero
unmasked, all others
masked; interrupts not
suspended
Signalling Multiframe
13
12
12
12
12
12
12
12
13
13
Data Link
Deactivated
14
14
14
Transmit MFAS (CAS)
00001111
15
15
15
Transmit non-FAS
1/S
n
1111111
SIG
16
16
0
X
Transmit FAS
C
n
0011011
17
17
1
16
E8Ko
Deactivated
18
18
2
17
Loopbacks
Deactivated
19
19
3
18
ST-BUS Offset
00000000*
20
20
4
19
Mode
Termination
21
21
5
20
Port Selection
as per pins S/P & ST/SC
22
22
6
21
Function
Status
Figure 4c - Relationship between PCM 30 Frames, Channels and CSTo1 Channels
24
23
24
24
24
24
23
23
23
23
7
22
8
23
8
8
8
8
Interrupts
RxMF Output
Error Insertion
Coding
Tx/Rx Buffers
Counters
Deactivated
5
5
4
4
4
4
3
3
3
3
2
2
2
2
0
0
0
DSTi #
4-246
DSTo
See the Applications section for the MT9079
initialization procedure.
Timeslot 16 for
channel
Table 3 - Reset Status
*cleared by the RESET pin, but not by the
RST control bit.
2
1
1
1
1
1
CSTo1/CSTi2
PCM 30
Timeslot #
PCM 30
Timeslot #
Basic Frame
PCM 30
0
X
0
1
1
2
2
Random
3
3
3
Deactivated
4
4
4
10*
CCS = denotes Signalling Channel if Common Channel Signalling Mode Selected
x = Unused Channel
11
10
9
8
7
6
5
11
11
11
11
10
10
10
10
9
9
9
9
7
7
7
7
6
6
6
6
5
5
5
5
6
6
7
7
8
8
9
9
10
10
11
11
MITEL [ MITEL NETWORKS CORPORATION ]
