EPF8282AV datasheet(52/61 Pages) ALTERA

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Altera Corporation

FLEX 8000 Programmable Logic Device Family Data Sheet

Operating Modes

The FLEX 8000 architecture uses SRAM elements that require

configuration data to be loaded whenever the device powers up and

begins operation. The process of physically loading the SRAM

programming data into the device is called configuration. During

initialization, which occurs immediately after configuration, the device

resets registers, enables I/O pins, and begins to operate as a logic device.

The I/O pins are tri-stated during power-up, and before and during

configuration. The configuration and initialization processes together are

called command mode; normal device operation is called user mode.

SRAM elements allow FLEX 8000 devices to be reconfigured in-circuit

with new programming data that is loaded into the device. Real-time

reconfiguration is performed by forcing the device into command mode

with a device pin, loading different programming data, reinitializing the

device, and resuming user-mode operation. The entire reconfiguration

process requires less than 100 ms and can be used to dynamically

reconfigure an entire system. In-field upgrades can be performed by

distributing new configuration files.

Conﬁguration Schemes

The configuration data for a FLEX 8000 device can be loaded with one of

six configuration schemes, chosen on the basis of the target application.

Both active and passive schemes are available. In the active configuration

schemes, the FLEX 8000 device functions as the controller, directing the

loading operation, controlling external EPROM devices, and completing

the loading process. The clock source for all active configuration schemes

is an oscillator on the FLEX 8000 device that operates between 2 MHz and

6 MHz. In the passive configuration schemes, an external controller

guides the FLEX 8000 device. Table 14 shows the data source for each of

the six configuration schemes.

Table 14. Data Source for Configuration

Configuration Scheme

Acronym

Data Source

Active serial

Altera Configuration EPROM

Active parallel up

APU

Parallel EPROM

Active parallel down

APD

Parallel EPROM

Passive serial

Serial data path

Passive parallel synchronous

PPS

Intelligent host

Passive parallel asynchronous

PPA

Intelligent host

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