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MT9072
Data Sheet
68
Zarlink Semiconductor Inc.
mask is located in register Y46 bit 4 (clear to enable interrupt); and the CASRI interrupt status bit in register is Y36
bit 4. Any channels marked as clear channels will not generate an interrupt due to changes in ABCD bits.
8.2.2.1 E1 Channel Associated Signaling (CAS) Transmit from ST-BUS CSTi to PCM30
Table 25 shows the detailed bit mapping of CSTi timeslots to transmit PCM30 frames.
8.2.2.2 E1 Channel Associated Signaling (CAS) Receive from PCM30 to ST-BUS CSTo
Table 26 shows the detailed bit mapping of CSTo timeslots from receive PCM30 frames.
Frame
ST-BUS CSTi
PCM30 Transmit
Timeslot
Data Bits (B7-B0)
Timeslot
Data Bits (B1-B8)
0
0 + n
not used.
16
CAS Multiframe Alignment Signal
1m + n to
15m + n
#,#,#,#,A1, B1, C1, D1 to
#,#,#,#,A15, B15, C15, D15
16m + n
not used.
17m + n to
31m + n
#,#,#,#,A16, B16, C16, D16, to
#,#,#,#,A30, B30, C30, D30
1 to 15
as above
as above
16
A1, B1, C1, D1, A16, B16, C16, D16 to
A15, B15, C15, D15, A30, B30, C30, D30
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. The number following the ABCD signaling bit letter designates the channel number (i.e., A30 designates channel 30).
Note 4. For these functions to be valid, CAS mode must be selected (CSIG=0 register address Y03), and the required ST-BUS
channels must be enabled (CASS=0 of register address Y90-YAF).
Note 5. # indicates data which is not transmitted.
Table 25 - Transmit PCM30 CAS Channels 1 to 30 from ST-BUS 2.048 Mbit/s or 8.192 Mbit/s CSTi (E1)
CAS
Frame
ST-BUS CSTo
PCM30 Receive
Timeslot
Data Bits (B7-B0)
Timeslot
Data Bits (B1-B8)
0
0 + n
1m + n to
15m + n
16m + n
17m + n to
31m + n
as above as above
not used.
1,1,1,1,A1, B1, C1, D1, to
1,1,1,1,A15, B15, C15, D15
not used.
1,1,1,1,A16, B16, C16, D16, to
1,1,1,1,A30, B30, C30, D30
16
CAS Multiframe Alignment Signal
1 to 15
16
A1, B1, C1, D1, A16, B16, C16, D16 to
A15, B15, C15, D15, A30, B30, C30, D30
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. The number following the ABCD signaling bit letter designates the channel number (i.e., A30 designates channel 30).
Note 4. For these functions to be valid, CAS mode must be selected (CSIG=0 register address Y03).
Note 5. “1” indicates bit positions in a logic high state.
Table 26 - Receive PCM30 CAS Channels 1 to 30 to ST-BUS 2.048 Mbits or 8.192 Mbits CSTo (E1)