MT9072AV ZARLINK [Zarlink Semiconductor Inc], MT9072AV Datasheet - Page 67
MT9072AV
Manufacturer Part Number
MT9072AV
Description
Octal T1/E1/J1 Framer
Manufacturer
ZARLINK [Zarlink Semiconductor Inc]
Datasheet
1.MT9072AV.pdf
(275 pages)
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8.2.2
The CSIG control bit (register address Y03) must be set to zero for Channel Associated signaling (CAS) operation.
Access to the ABCD transmit and receive bits may be either through ST-BUS channels 1 to 15 and channels 17 to
31 at the CSTi and CSTo pins, or through the Transmit CAS Data registers (Y51-Y6F) and Receive CAS Data
registers (Y71-Y8F) accessed by the parallel processor port, or through a mix of both methods. The timeslot control
register bits (CASS(n) address Y90-YAF) determine the source of the CAS data on a per channel basis. A zero
enables an ST-BUS source and a one enables a register source. Note that when changing the CASS(n) control bits
from ST-BUS source to register source on the fly (during normal operation as opposed to during power up), the
data in the Transmit CAS Data registers (Y51-Y6F) should be updated one frame after the timeslot control register
bits (CASS(n)) are changed. This is because the timeslot control register bits do not take effect immediately. Both
destinations of CAS data are always enabled (i.e., ST-BUS CSTo and receive data registers). ST-BUS CSTi and
CSTo channels 0 and 16 are not used.
When the CASRI interrupt is unmasked, IRQ will become active when a signaling state change is detected in any of
the 30 receive channels and a selectable 2 msec, 8 msec or 16 msec timer(Y04 bit 0,1) has expired. This function
helps to reduce the frequency of interrupts generated due to signaling changes. For instance if 7 channels had a
signaling change only one interrupt will be generated in a 2, 8 or 16 msec duration. Upon an interrupt the user has
to read the CAS registers (Y70 to Y8F) to determine the channels with a signaling change.The CASRIM interrupt
MAS - Multiframe Alignment Signal
NMAS - Non-multiframe Alignment Signal
X - Spare Bit = 1 if not used
Y - Remote Multiframe Alarm Signal
E1 Channel Associated Signaling (CAS) Register and ST-BUS Access
multiframing)
(not related
Associated
Multiframe
to CRC-4
signaling
Channel
Table 24 - Channel Associated Signaling (CAS) Multiframe Structure (E1)
(CAS)
Frame
CAS
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
Zarlink Semiconductor Inc.
MT9072
1
67
ABCD (ch 10 = ts 10)
ABCD (ch 12 = ts 12)
ABCD (ch 13 = ts 13)
ABCD (ch 14 = ts 14)
ABCD (ch 15 = ts 15)
ABCD (ch 11 = ts 11)
ABCD (ch 2 = ts 2)
ABCD (ch 3 = ts 3)
ABCD (ch 4 = ts 4)
ABCD (ch 5 = ts 5)
ABCD (ch 6 = ts 6)
ABCD (ch 7 = ts 7)
ABCD (ch 8 = ts 8)
ABCD (ch 9 = ts 9)
ABCD (ch 1 = ts1)
0000 (MAS)
2
3
PCM30 Timeslot 16
4
5
ABCD (ch 16 = ts 17)
ABCD (ch 17 = ts 18)
ABCD (ch 18 = ts 19)
ABCD (ch 19 = ts 20)
ABCD (ch 20 = ts 21)
ABCD (ch 21 = ts 22)
ABCD (ch 22 = ts 23)
ABCD (ch 23 = ts 24)
ABCD (ch 24 = ts 25)
ABCD (ch 25 = ts 26)
ABCD (ch 26 = ts 27)
ABCD (ch 27 = ts 28)
ABCD (ch 28 = ts 29)
ABCD (ch 29 = ts 30)
ABCD (ch 30 = ts 31)
XYXX (NMAS)
6
Data Sheet
7
8
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