STV3550 datasheet(78/144 Pages) STMICROELECTRONICS

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STV3550

CPU and System Management Functional Description

6.3.11.4 Mixed Configuration with two SDRAM Devices

This configuration is able to implement low-cost and high-end solutions on the same printed circuit

board as described in previous sections.

This configuration is dedicated for the development of universal TV chassis boards that suit several

types of hardware and software applications. It can also be used for a development board.

This configuration requires two SDRAM footprints with 16 data lines each.

One SDRAM device is connected to the upper half of the data bus, while the other device is

connected to the lower half. The Flash memory shares the lower half of the data bus with one of the

SDRAM devices.

Figure 50: High-End Configuration using 2 SDRAM Devices

ADDR[19:0]

DATA[15:0]

A[11:0]

DQ[15:0]

RAS

CAS

FLASH

16Mb

DQM[1:0]

SDRAM

64Mb

STV3550

NOT_CS_FLASH

ADDR[19:0]

FLASH_D[15:0]

NOT_RAS

NOT_CAS

RD_NOT_WR

NOT_BE[1:0]

CKOUT_SDRAM

SDRAM_D[15:0]

NOT_CS_SDRAM

[19:0]

[12:1]

[15:0]

CLK

BA[1:0]

[16:15]

CKEN

CKIN_SDRAM

[19:18]

A[11:0]

DQ[15:0]

RAS

CAS

DQM[1:0]

SDRAM

64Mb

CLK

BA[1:0]

CKEN

[12:1]

[16:15]

LSBs of Data

MSBs of Data

[19:0]

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