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ST20196 bảng dữ liệu(PDF) 4 Page - STMicroelectronics

tên linh kiện ST20196
Giải thích chi tiết về linh kiện  ADSL, ADSL2 and ADSL Modem Chipset for CPE Applications with Utopia II Interface
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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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


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