CMX625 datasheet(4/34 Pages) CMLMICRO

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ISDN TA POTS Interface

CMX625

 2001 Consumer Microcircuits Limited

D/625/2

1.3

Signal List

CMX625

D5/P4

Signal

Description

Pin No.

Name

Type

FSC

I/P

The IOM-2 Frame Synchronisation Clock. This is an 8kHz

clock indicating the start of the frame. FSC is generated

by the upstream device. See section 1.5.1, 1.5.2 and

1.5.3.

DCL

I/P

The IOM-2 Data Clock. It is used to clock data on and off

the bus and operates at 1.536MHz for Terminal mode

(TE) or 4.096MHz for non-Terminal mode (non-TE or Line

Card mode). DCL is generated by the upstream device.

When the bus is deactivated, DCL is held in a low state.

See section 1.5.1, 1.5.2 and 1.5.3.

The IOM-2 Data Downstream, receives data from the

network. When the bus is deactivated or when data is not

being transmitted, DD is high impedance. The IC Channel

Bus Reversal (TE mode only) allows IC1 and IC2 data to

be transmitted on the DD pin. See section 1.5.1, 1.5.2,

1.5.3 and 1.5.6. An external pull-up resistor is required.

The IOM-2 Data Upstream, transmits data to the network.

When the bus is deactivated or when data is not being

transmitted, DU is high impedance. The IC Channel Bus

Reversal (TE mode only) allows IC1 and IC2 data to be

received on the DU pin. See section 1.5.1, 1.5.2, 1.5.3

and 1.5.6. An external pull-up resistor is required.

TE/NTE

I/P

The IOM-2 two modes of operation:

TE = 0 selects

Terminal mode. NTE = 1 selects Non-Terminal mode or

Line Card mode. See section 1.5.1, 1.5.2 and 1.5.3.

SA0

I/P

) The IOM-2 Slot Address, provides one of 8 unique

SA1

I/P

) addresses. It allows the device to be individually

SA2

I/P

) addressed when more than one device is connected

) to the IOM-2 bus. See section 1.5.2 and 1.5.3.

I/P

The IOM-2 Device Select pin (NTE mode only). Allows two

CMX625 devices sharing a Slot Address to be individually

addressed. DS = 0 selects device one. DS = 1 selects

device two. See section 1.5.2 and 1.5.3.

RESET

I/P

The external reset pin clears all the registers. (RESET=1)

IRQN

O/P

A ‘wire-Orable’ output Interrupt Request. This output is

pulled down to VSS when active and is high impedance

when inactive. An external pull-up resistor is required.

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