ISDN Dual Telephony Protocol Engine

CMX208

© 1999 Consumer Microcircuits Limited

17

D/208/1

© 1999 Chiron Technology Limited

1.5.6

Application Programmer's Interface

Details of this will be supplied to customers under a Non-Disclosure Agreement.

The following Memory Map indicates the main code areas used on the CMX208:

Function

Start Hex Address

End Hex Address

Code Space

000 000

01F FFF

External RAM

020 000

03F FFF

API area

0C0 000

0EF FFF

AMD79C30

ISDN Interface Chip

0F0 000

0F0 0FF

PSB21525

HDLC Driver Chip

0F0 100

0F0 1FF

Reserved

0F0 200

0FF FFF

1.5.7

Hardware Description

1.5.7.1 LED Status Indicators (LED1 to LED9, and ILFI)

LED1 (HK1) is low when analogue port 1 is off-hook, high when on-hook.

LED2 (HK2) is low when analogue port 2 is off-hook, high when on-hook.

LED4 (CN2) is high when analogue port 2 is connected to the ISDN network, low when not connected.

LED8 (AR) is pulsed high and low until the ISDN line is activated, when it remains low constantly.

LED9 (CN1) is high when analogue port 1 is connected to the ISDN network, low when not connected.

ILFI is high when an ISDN Link Failure is Indicated, low when the link is operational.

The functions of the LED and ILFI indicators are set out in the table below:

Pin No.

Designation

POTS port 1

POTS port 2

12

LED1

Off-Hook

~

13

LED2

~

Off-Hook

15

LED4

~

Call Connected

19

LED8

ISDN Line Activated

ISDN Line Activated

21

LED9

Call Connected

~

54

ILFI

ISDN Line Failure

Indicator

ISDN Line Failure

Indicator