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MT8950

ISO-CMOS ST-BUS™ FAMILY Data Codec

Mitel Networks 

MT8950 ISO-CMOS

CSTi 1

DSTi 2

C2i 3

DSTo 4

F1i 5

CA 6

DF 7

RxE 8

DX1 9

DX2 10

NRZo 11

VSS 12

24 VDD

23 NC

22 PRST

21 NC

20 NC

19 DR1

18 DR2

17 DA

16 SPo

15 SPi

14 DP

13 SCLK

Figure 2 - Pin Connections

Pin Description

Pin #

1

Name

CSTi

2

DSTi

3

C2i

4

DSTo

5

F1i

6

CA

7

DF

8

RxE

9

DX1

Description

Control ST-BUS In (TTL Input) - This ST-BUS interface pin accepts a serial input

stream which loads the Control Register. The mode of operation of the

device, the bits in the Violation word, and, the resetting of Data Activity (DA) and

Scan Point output (SPo) are controlled by this register. The contents of the register

are updated once every ST-BUS frame when the interface is enabled.

Data ST-BUS In (TTL Input) - Accepts the 8 bits of TEM Data when the ST-BUS

interface is enabled.

2.048 MHz Clock (TTL Input) - This is the input for the 2.048 MHz clock.

ST-BUS Output (Three-State Output) - This is the 2.048 Mbps serial output for

theTEM encoded word. It is enabled when both F1i and CA are low.

Framing Type 1 Input (TTL Input) - This active low input, in conjunction with CA,

enables the ST-BUS interface (DSTi, DSTo and CSTi). It is internally sampled on

every positive edge of the C2i clock and provides frame synchronization.

Control Address (TTL Input) - This active low input (in conjunction with F1i)

enables the ST-BUS interface.

Data Format Select (CMOS Input) - When HIGH, the Data Codec accepts and

delivers the data in unipolar Return to Zero (RZ) format. When LOW, the data

format is unipolar NRZ.

Received Energy Signal (Schmitt Input) - When RxE goes LOW it establishes the

polarity of the input pins DX1 and DX2 in the RZ mode. The input which received the

last pulse before RxE goes LOW is established as the unipolar MARK input. RxE

also enables the operation of DA and SPo outputs the loopback modes (Modes 4, 5

and 6) of the codec, RxE is forced to the LOW state internally independent of the pin

condition. RxE should be exerted LOW for the duration of a data call.

Data Transmit 1 (Schmitt Input) - If DF= LOW, accepts data in the NRZ format.

(HIGH = MARK, LOW = SPACE).

If DF=HIGH, accepts active low unipolar pulses representing the digital data in the

RZ format. MARK or SPACE polarity is established by the RxE input.

6-4

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