CS61577 datasheet(8/44 Pages) ETC

8 / 44 page

THEORY OF OPERATION

CS61577 Enhancements Relative to CS61574

Existing designs using the CS61574 can be con-

verted to the higher performance, pin-compatible

CS61577 with no changes to the PCB, external

component or system software.

The CS61577 provides higher performance and

more features than the CS61574 including:

• Selection of 75 Ω or 120 Ω E1 output op-

tions under software or hardware control,

• 50 mARMS transmitter short-circuit current

limiting for E1 (per OFTEL OTR-001),

•

internally controlled pulse width for E1

output options,

• 35% lower power consumption,

• Increased transmitter immunity to signal re-

flections for improved signal quality,

• Optional AMI, B8ZS, HDB3 encoder/de-

coder or external line coding support,

• Receiver AIS (unframed all ones) detection,

• Improved receiver Loss of Signal handling

(LOS set at power-up, reset upon receipt of

3 ones in 32 bit periods with no more than

15 consecutive zeros),

• Transmitter TTIP and TRING outputs are

forced low when TCLK is static,

• The Driver Performance Monitor operates

over a wider range of input signal levels.

Introduction to Operating Modes

The CS61577 supports three operating modes

which are selected by the level of the MODE pin

as shown in Tables 1 and 2, Figure 7, and Figures

A1-A3 of the Applications section.

The modes are Hardware Mode, Extended Hard-

ware Mode, and Host Mode. In Hardware and

Extended Hardware Modes, discrete pins are used

to configure and monitor the device. The Ex-

tended Hardware Mode provides a parallel chip

select input which latches the control inputs al-

lowing individual ICs to be configured using a

common set of control lines. In the Host Mode,

an external processor monitors and configures the

device through a serial interface. There are thir-

teen multi-function pins whose functionality is

determined by the operating mode. (see Table 2).

Hardware

Mode

Extended

Hardware

Mode

Host

Mode

Control

Method

Control

Pins

Control Pins

with Parallel

Chip Select

Serial

Interface

MODE

Level

<0.2 V

Floating or

2.5 V

>(RV+)-0.2 V

Line

Coding

External

Internal-

AMI, B8ZS,

or HDB3

External

AIS

Detection

Yes

Driver

Performance

Monitor

Yes

Table 1. Differences Between Operating Modes

MODE

FUNCTION

PIN HARDWARE

EXTENDED

HARDWARE

HOST

TRANSMITTER

3TPOS

TDATA

TPOS

4TNEG

TCODE

TNEG

RECEIVER/DPM

RNEG

BPV

RNEG

7RPOS

RDATA

RPOS

DPM

AIS

DPM

MTIP

RCODE

MTIP

MRING

CONTROL

PCS

LEN0

INT

LEN1

SDI

LEN2

SDO

RLOOP

LLOOP

SCLK

TAOS

CLKE

Table 2. Pin Definitions

CS61577

DS155PP2

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