CS61304A データシートの表示（PDF） - Cirrus Logic

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CS61304A

T1/E1 Line Interface

Cirrus Logic 

THEORY OF OPERATION

Key Enhancements of the CS61304A Relative

to the LXT304A

• 12.5% Lower Power Consumption,

• 50 mARMS transmitter short-circuit current

limiting for E1 (per OFTEL OTR-001),

• 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,

Introduction to Operating Modes

The CS61304A 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).

CS61304A

CS61304A

Control

Method

MODE

Pin

Level

Line

Coding

AIS

Detection

Driver

Performance

Monitor

Hardware

Mode

Control

Pins

<0.2 V

External

No

Yes

Extended

Host

Hardware

Mode

Mode

Control Pins Serial

with Parallel Interface

Chip Select

Floating or >(RV+)-0.2

2.5 V

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

LEN1

CONTROL

25

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

DSD1S5165P6PF21

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