MT8979 Datasheet, PDF (2/26 Pages) Mitel Networks Corporation – ISO-CMOS ST-BUS™ FAMILY CEPT PCM 30/CRC-4 Framer & Interface

MT8979 ISO-CMOS
TxA ¹
TxB
2
DSTo 3
NC 4
RxA
5
RxB ⁶
RxD ⁷
CSTi1 ⁸
NC ⁹
NC ¹⁰
ADI ¹¹
CSTi0 ¹²
E8Ko 13
VSS 14
28 VDD
27 ^IC
26 F0i
25 E2i
24 NC
23 RxMF
22 TxMF
21 C2i
20 NC
19 ^DSTi
18 NC
17 CSTo
16 XSt
15 ^XCtl
28 PIN CERDIP/PDIP
NC
NC
RxA
RxB
RxD
NC
CSTi1
NC
NC
NC
ADI
6
7
5
4
3
2
1 ^{44 43 42 41 40}
39
8
38
9
37
10
36
11
35
12
34
13
33
14
32
15
31
16
30
17
29
18 19 20 21 22 23 24 25 26 27 28
NC
RxMF
TxMF
NC
NC
C2i
NC
NC
NC
NC
NC
44 PIN PLCC
Pin Description
Figure 2 - Pin Connections
Pin #
DIP PLCC
12
23
35
44
59
6 10
7 11
8 13
9
10
11 17
12 19
Name
TxA
TxB
DSTo
NC
RxA
RxB
RxD
CSTi1
NC
NC
ADI
CSTi0
Description
Transmit A (Output): A split phase unipolar signal suitable for use with TxB and an
external line driver and transformer to construct the bipolar line signal.
Transmit B (Output:) A split phase unipolar signal suitable for use with TxA and an
external line driver and transformer to construct the bipolar line signal.
Data ST-BUS (Output): A 2048 kbit/s serial output stream which contains the 30 PCM or
data channels received from the CEPT line.
No Connection.
Receive A (Input): Received split phase unipolar signal decoded from a bipolar line
receiver.
Receive B (Input): Received split phase unipolar signal decoded from a bipolar line
receiver.
Received Data (Input): Input of the unipolar data generated from the line receiver. This
data may be NRZ or RZ.
Control ST-BUS Input #1: A 2048 kbit/s stream that contains channel associated
signalling, frame alignment and diagnostic functions.
No Connection.
No Connection.
Alternate Digit Inversion (Input): If this input is high, the CEPT timeslots which are
specified on CSTi0 as voice channels are ADI coded and decoded. When this bit is low it
disables ADI coding for all channels. This feature allows either ADI or non-ADI codecs to
be used on DSTi and DSTo.
Control ST-BUS Input #0: A 2048 kbit/s stream that contains 30 per channel control
words and two Master Control Words.
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