MT9072AB datasheet(67/275 Pages) ZARLINK

67 / 275 page

MT9072

Data Sheet

Zarlink Semiconductor Inc.

8.2.2

E1 Channel Associated Signaling (CAS) Register and ST-BUS Access

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

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

CAS

Frame

PCM30 Timeslot 16

1234

5678

Channel

Associated

signaling

(CAS)

Multiframe

(not related

to CRC-4

multiframing)

MAS - Multiframe Alignment Signal

NMAS - Non-multiframe Alignment Signal

X - Spare Bit = 1 if not used

Y - Remote Multiframe Alarm Signal

0000 (MAS)

XYXX (NMAS)

ABCD (ch 1 = ts1)

ABCD (ch 16 = ts 17)

ABCD (ch 2 = ts 2)

ABCD (ch 17 = ts 18)

ABCD (ch 3 = ts 3)

ABCD (ch 18 = ts 19)

ABCD (ch 4 = ts 4)

ABCD (ch 19 = ts 20)

ABCD (ch 5 = ts 5)

ABCD (ch 20 = ts 21)

ABCD (ch 6 = ts 6)

ABCD (ch 21 = ts 22)

ABCD (ch 7 = ts 7)

ABCD (ch 22 = ts 23)

ABCD (ch 8 = ts 8)

ABCD (ch 23 = ts 24)

ABCD (ch 9 = ts 9)

ABCD (ch 24 = ts 25)

ABCD (ch 10 = ts 10)

ABCD (ch 25 = ts 26)

ABCD (ch 11 = ts 11)

ABCD (ch 26 = ts 27)

ABCD (ch 12 = ts 12)

ABCD (ch 27 = ts 28)

ABCD (ch 13 = ts 13)

ABCD (ch 28 = ts 29)

ABCD (ch 14 = ts 14)

ABCD (ch 29 = ts 30)

ABCD (ch 15 = ts 15)

ABCD (ch 30 = ts 31)

Table 24 - Channel Associated Signaling (CAS) Multiframe Structure (E1)

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