ATF280F_14 datasheet(53/107 Pages) ATMEL

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ATF280F [DATASHEET]

7750E

−AERO−05/12

Figure 5-21. ATF280F Configuration Download Link

User I/O

FPGA Core

Configuration

SRAM

POR

Configuration

control

Boundary

Scan

Controller

LVDS

Interface

Differential

Clocks

Configuration

Self Internal

Checker

Configuration

Load Checker

EEPROM Core

Memory Controller

Parallel

Interface

POR

TWI

Interface

Parallel EEPROM

ATF280

Checksum

Two kinds of errors are managed during the configuration:

• Low Level Errors

Such protection is used to warranty that the communication protocol on the FPGA serial communication link is

correctly handled all along the configuration process. In addition, the low level error management ensures that

no erroneous access to the FPGA configuration SRAM will be attempted.

When detected, the low level results in “Aborting Download”. This means that all the steps from a configuration

download are not performed. The consequence is that the bitstream is partially loaded and can result in an

unoperating FPGA,

• Checksum Errors

This protection is used at the end of the configuration download to verify that there were no corruptions of the

data stream during the transfer.

When detected, the checksum error results in “Finishing download”. This means that all the steps from a

nominal configuration download are executed until entering in Run lifephase.

The error detection mechanism follows the flow chart presented here after.

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