MT9072AB datasheet(210/275 Pages) ZARLINK

210 / 275 page

MT9072

Data Sheet

210

Zarlink Semiconductor Inc.

17.2.8

Transmit CAS (ABCD) Data Registers (Y51 - Y6F) Bit Functions

Table 190 describes the bit functions of each (30 registers in total, one register for each PCM 30 channel) of the

Transmit CAS Data Registers in the MT9072. Each register is repeated for each of the 8 framers. Framer 0 is

addressed with Y=0, Framer 1 with Y=1, Framer 2 with Y=2 and so on up to Framer 7 with Y=7 (where Y represents

the 4 most significant address bits (MSB) A11-A8). In addition, a simultaneous write to all 8 framers is possible by

setting the MSB address to Y=8 (1000). Note that if corresponding MPST bit in the per timeslot control is not set

this memory will be constantly updated with CSTi values. Hence to use this registers for any channels the

corresponding MPST bit has to be set.

A (0), (1) or (#) in the “Name” column of these tables indicates the state of the data bits after a reset (RESET, RSTC

or RST). The (#) indicates that a (0) or (1) is possible.

2T2M

(0)

Timer 2 Mask. This is the mask bit for the T2I interrupt status bit in the National (CAS,

National, CRC-4 Local and Timers) Interrupt Status Register (address Y36). If this mask bit is

one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the

corresponding interrupt bit will function normally.

1T1M

(0)

Timer 1 Mask. This is the mask bit for the T1I interrupt status bit in the National (CAS,

National, CRC-4 Local and Timers) Interrupt Status Register (address Y36). If this mask bit is

one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the

corresponding interrupt bit will function normally.

ONESECM

(0)

One Second Timer Status Mask. This is the mask bit for the ONESECI interrupt status bit in

the National (CAS, National, CRC-4 Local and Timers) Interrupt Status Register (address

Y36). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit

is zero, the corresponding interrupt bit will function normally.

Bit

Name

Functional Description

15-4

(#### #### ####)

not used.

3A(n)

(#)

Transmit Channel Associated Signaling (CAS) Signaling Bits for Channel 1 to

30.

Bits for n=1 to 15 correspond to channel 1 to 15 and are transmitted on the

PCM30 link in timeslot 16 in bit positions one to four in frame n.

Bits for n=17 to 31 correspond to channel 16 to 30 and are transmitted on the

PCM30 link in timeslot 16 in bit positions five to eight in frame n -16.

The corresponding CASS(n) bit must be one for this to function.

2B(n)

(#)

1C(n)

(#)

0D(n)

(#)

For these functions to be valid, CAS mode must be selected (CSIG=0 register address Y03), and the timeslot

control must be selected (CASS(n)=1 register address Y90 to YAF).

Table 185 - Channel n, Transmit CAS Data Register (Address Y51-Y6F) (E1)

Bit

Name

Functional Description

Table 184 - National (CAS, National, CRC-4 Local and Timers) Interrupt Mask Register (Address Y46)

(E1)

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