CDB61581 datasheet(3/16 Pages) CIRRUS

부품명	CDB61581

상세설명	Universal Line Interface Unit

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제조업체	CIRRUS [Cirrus Logic]

홈페이지	http://www.cirrus.com

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CDB61581

DS211DB2

3

1. POWER SUPPLY

As shown on the evaluation board schematic in

Figure 1, power is supplied to the board from an ex-

ternal +5 Volt supply connected to the two binding

posts labeled V+ and GND. Zener diode Z1 pro-

tects the components on the board from reversed

supply connections and over-voltage damage. Ca-

pacitor C1 provides power supply decoupling and

ferrite bead L1 helps isolate the CS61581 and buff-

er supplies. Capacitors C4, C5 and C6 provide

power supply decoupling for the CS61581. The

buffer U2 is decoupled using capacitor C15. Ferrite

bead L7 helps isolates the devices U2, U3 and U4.

2. BOARD CONFIGURATION

Slide switch S1 selects hardware, host or hardware-

coder mode operation by sliding it into HW, SW or

HWCDR positions, respectively.

2.1. Hardware Mode

In Hardware mode operation, the evaluation board

is configured using the DIP switch SW1. In this

mode, the switch establishes the digital control in-

puts for both line interface channels. Closing a DIP

switch away from the label sets the CS61581 con-

trol pin of the same name to a logic 1. The host pro-

cessor interface J1 should not be used in the

Hardware mode.

The CDB61581 switches and functions are listed

below:

-

TAOS: transmit all ones;

-

LLOOP: local loopback;

-

RLOOP: remote loopback;

-

JASEL: jitter attenuator path selection;

-

LBO1, LBO2: line build out settings.

All switch inputs are pulled-high using resistor net-

work RN1.

2.1.1. Network Loopback

NLOOP is enabled in the hardware mode by clos-

ing HDR11 (HW_NLOOP) and then pressing S2. It

can also be done by sliding the switches RLOOP,

LLOOP and TAOS on SW1 towards the labels,

pulling them high, and then pulling them back to

low by sliding RLOOP, LLOOP and TAOS to OFF

(away from the labels), in that order. NLOOP can

then be turned on by sending 1-in-5 pattern on the

RTIP and RRING pins for five seconds. The

NLOOP LED will light up at this point if HDR6 is

jumped to NLOOP_LED position. NLOOP can be

turned off by sending a 1-in-3 pattern on the pins

RTIP and RRING or five seconds.

2.2. Hardware-Coder Mode

This mode is essentially the same as the Hardware

mode with the B8ZS or HDB3 encoder/decoder en-

abled.

2.3. Host Mode

In Host mode operation, the evaluation board sup-

ports serial-port operation over interface port J1 us-

ing the printer port of a host PC running the

enclosed software. The evaluation board is con-

nected to the host PC using a DB-25 male-to-male

cable (included). Ferrite beads L2-L6 help reduce

incoming noise from the host interface. The SW1

switch must be open (all switches slid away from

the labels) to enable serial-port operation.

An external microprocessor may also interface to

the evaluation board to facilitate system software

development. The CS61581 interrupt pin, INT, is

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