CS61577-IL1Z データシートの表示（PDF） - Cirrus Logic

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CS61577-IL1Z

T1/E1 Line Interface

Cirrus Logic 

CS61577

#3

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

Control

Method

Control

Pins

MODE

Pin

Level

Line

Coding

<0.2 V

External

AIS

No

Detection

Driver

Yes

Performance

Monitor

Extended

Host

Hardware

Mode

Mode

Control Pins Serial

with Parallel Interface

Chip Select

Floating or >(RV+)-0.2 V

2.5 V

Internal-

AMI, B8ZS,

or HDB3

Yes

External

No

No

Yes

Table 1. Differences Between Operating Modes

MODE

FUNCTION

EXTENDED

PIN HARDWARE HARDWARE

TRANSMITTER 3

4

TPOS

TNEG

TDATA

TCODE

6

RNEG

BPV

7

RECEIVER/DPM 11

RPOS

DPM

RDATA

AIS

17

MTIP

RCODE

18 MRING

-

18

-

PCS

23

LEN0

LEN0

24

CONTROL

25

LEN1

LEN2

LEN1

LEN2

26 RLOOP

RLOOP

27 LLOOP

LLOOP

28

TAOS

TAOS

HOST

TPOS

TNEG

RNEG

RPOS

DPM

MTIP

MRING

-

INT

SDI

SDO

CS

SCLK

CLKE

Table 2. Pin Definitions

8

$3DS15050F

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