ISO-CMOS

MT8950

6-9

Figure 4 - Example Input/Output Waveform in the RZ format (DF=HIGH)

NRZ

Equivalent

Bipolar RZ

Equivalent

RxE

MARK Pulses

(Polarity

Established)

SPACE Pulses.

MARK

MARK

SPACE

SPACE

D

D

D

DV

V

VV

VV

DD

DD

DD

DD

Signal Regenerated at Remote End

MARK Pulses

SPACE Pulses

Establishes MARK polarity. See text for complete explanation.

52

µs. Nom. or

104

µs. Nom. or

> 125

µs

52

µs. Nom. or

104

µs. Nom. or

> 125

µs

4

µs. Min.

35

µs. Nom.

35

µs. Nom.

125

µs.

Min.

125

µs. Min.

125

µs.

Min.

V = Violations Pulse; D = Data Pulse

word on the first rising edge of the clock after F1i

and CA are taken low.

The 8 bit TEM word from

the input ST-BUS stream is clocked into the device

on the negative edge of the C2i clock. For proper

codec operation, the ST-BUS interface (DSTo, DSTi,

and CSTi) should be enabled for only 8 clock periods

of the C2i clock in any 125µs period (one ST-BUS

frame time) as shown in Figure 11.

All data input

and output at the ST-BUS interface takes place at

2.048 Mbps.

Figure 5 - Example Input/Output Waveform in the NRZ format (DF=LOW)

Secondary

Input

Signal Regenerated at Remote End

52

µs. Nom. or

104

µs. Nom. or

> 125

µs

MARK

MARK

MARK

MARK

SPACE

SPACE

SPACE

SPACE

125

µs. Min.

NRZ Input

Data

Output

Secondary

Output

4

µs. Min.

121

µs. Max.

125

µs.

Min.