MT9072AB datasheet(69/275 Pages) ZARLINK

69 / 275 page

MT9072

Data Sheet

Zarlink Semiconductor Inc.

8.2.3

E1 Common Channel Signaling (CCS) Transmit from ST-BUS CSTi and DSTi to PCM30

The CSIG control bit (register address Y03) must be set to one for Common Channel signaling (CCS) operation.

CCS on the transmit PCM30 link (bit positions one to eight of timeslots 15, 16 and/or 31 of every frame) may be

sourced from the ST-BUS DSTi stream or from the ST-BUS CSTi stream. If the TS15E, TS16E & TS31E control bits

(register address Y06) are zero, the transmit data will be sourced from the ST-BUS DSTi stream timeslots 15, 16

and 31, if these bits are one, then the signaling data will be sourced from the ST-BUS CSTi stream. Note that any

combination of the TS15E, TS16E & TS31E control bits (register address Y06) may be enabled. The CSTi source

timeslots for the PCM30 timeslot 15, 16 and 31, are determined respectively by the 15C4-15C0, 16C4-31C0 and

31C4-31C0 (register address Y07) programming bits. Table 27 shows the detailed bit mapping of CSTi timeslots to

transmit PCM30 frames. Table 28 shows the detailed bit mapping of DSTi timeslots to transmit PCM30 frames.

ST-BUS CSTi

PCM30 Transmit

CRC-4

Frame

Timeslot

Data Bits (B7-B0)

Timeslot CRC-4

Frame

Data Bits (B1-B8)

all

Any one of 32

n + m(0 to 31)

P1, P2, P3, P4, P5, P6, P7, P8

all

P1, P2, P3, P4, P5, P6, P7, P8

all

Any one of 32

n + m(0 to 31)

P1, P2, P3, P4, P5, P6, P7, P8

all

P1, P2, P3, P4, P5, P6, P7, P8

all

Any one of 32

n + m(0 to 31)

P1, P2, P3, P4, P5, P6, P7, P8

all

P1, P2, P3, P4, P5, P6, P7, P8

Note 1. For 2.048 Mbit/s operation, m=1 and n=0.

Note 2. For 8.192 Mbit/s operation, m=4 and n =0,1,2,3 where n corresponds to the framer number (i.e., n=0=framer 0... n=3= framer

Note 3. For these functions to be valid, CCS mode must be selected (CSIG=1 register address Y03) and CSTi ST-BUS mode must be

selected (TS15E=1, TS16E=1 & TS31E=1 register address Y06) and the preferred source CSTi timeslot should be selected (15C4-0,

16C4-0 & 31C4-0 register address Y07).

Table 27 - Transmit PCM30 CCS from ST-BUS 2.048 Mbit/s or 8.192 Mbit/s CSTi (E1)

ST-BUS DSTi

PCM30 Transmit

CRC-4

Frame

Timeslot

Data Bits (B7-B0)

Timeslot

CRC-4

Frame

Data Bits (B1-B8)

all

n + m(15) P1, P2, P3, P4, P5, P6, P7, P8

all

P1, P2, P3, P4, P5, P6, P7, P8

all

n + m(16) P1, P2, P3, P4, P5, P6, P7, P8

all

P1, P2, P3, P4, P5, P6, P7, P8

all

n + m(31) P1, P2, P3, P4, P5, P6, P7, P8

all

P1, P2, P3, P4, P5, P6, P7, P8

Note 1. For 2.048 Mbit/s operation, m=1 and n=0.

Note 2. For 8.192 Mbit/s operation, m=4 and n =0,1,2,3 where n corresponds to the framer number (i.e., n=0=framer 0... n=3= framer 3).

Note 3. For these functions to be valid, CCS mode must be selected (CSIG=1 register address Y03), and DSTi ST-BUS mode must be selected

(TS15E=0, TS16E=0 & TS31E=0 register address Y06).

Table 28 - Transmit PCM30 CCS from ST-BUS 2.048 Mbit/s or 8.192 Mbit/s DSTi (E1)

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