ST20190

4/7

Figure 4. Block Diagram of ST20196

5.2.3 Interface to Utopia Bus

The IC contains the ATM-related functions to interface with the ATM utopia bus an supports level 1 and 2

modes.

5.2.4 Control of Transceiver Chip

The ST20196 runs the firmware controlling the operations of the ADSL transceiver (AFE, DMT modem,

Framer). During modem initialisation, the controller computes and sets up parameters for all programma-

ble DMT functions, filters and equalizers. The ATM TC includes cell level functions (such as cell delinea-

tion, insertion/ extraction of idle cells, payload scrambling, HEC check) and data frame generation. The

controller is able to run in different rate-adaptive modes as defined by the operator. During operation, the

ST20196 performs continuous line monitoring and initiates consecutive actions as specified by the oper-

ator (e.g. bit-swapping, dynamic bit-rate adaptation, power management, … etc.) and collects perfor-

mance and error information for use by management entities.

5.2.5 Interface to Management Entities

The ST20196 also runs the communication protocol to interface with external management entities. A spe-

cific ADSL modem control interface has been defined to ease the integration with both systems hardware

and firmware. This control communication channel is used to transfer information and commands between

modem and management entities. These commands/responses are fully described in the CtrlE specifica-

tion and can be categorized as follows:

- Configuration of a modem line

- De-allocation of a modem line

- Operational Data Retrieval

- Performance Data Retrieval

- Defect Retrieval

FLASH

CTRL

SDRAM

CTRL

EBI

ROM

RAM

CTRLE

ARM946

AHB2APB

INTERRUPT

CTR

RT

TIMERS

WATCHDOG

UART

GPIO

JTAG

DMT

CORE

TIC

AFE

Interface

ATM

Interface