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EP2S90 Datasheet(PDF) 7 Page - Altera Corporation

Part # EP2S90
Description  1. Enhanced Configuration Devices (EPC4, EPC8, and EPC16) Data Sheet
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Manufacturer  ALTERA [Altera Corporation]
Direct Link  http://www.altera.com
Logo ALTERA - Altera Corporation

EP2S90 Datasheet(HTML) 7 Page - Altera Corporation

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Chapter 1: Enhanced Configuration Devices (EPC4, EPC8, and EPC16) Data Sheet
1–7
Functional Description
© December 2009
Altera Corporation
Configuration Handbook (Complete Two-Volume Set)
The enhanced configuration device features multiple configuration schemes. In
addition to supporting the traditional passive serial (PS) configuration scheme for a
single device or a serial device chain, the enhanced configuration device features
concurrent configuration and parallel configuration. With the concurrent
configuration scheme, up to eight PS device chains can be configured simultaneously.
In the FPP configuration scheme, 8-bits of data are clocked into the FPGA each cycle.
These schemes offer significantly reduced configuration times over traditional
schemes.
Furthermore, the enhanced configuration device features a dynamic configuration or
page mode feature. This feature allows you to dynamically reconfigure all the FPGAs
in your system with new images stored in the configuration memory. Up to eight
different system configurations or pages can be stored in memory and selected using
the PGM[2..0] pins. Your system can be dynamically reconfigured by selecting one
of the eight pages and initiating a reconfiguration cycle.
This page mode feature combined with the external flash interface allows remote and
local updates of system configuration data. The enhanced configuration devices are
compatible with the Stratix Remote System Configuration feature.
1 For more information about Stratix Remote System Configuration, refer to the Remote
System Configuration with Stratix & Stratix GX Devices chapter in the Stratix Device
Handbook.
Other user programmable features include:
Real-time decompression of configuration data
Programmable configuration clock (DCLK)
Flash ISP
Programmable power-on-reset delay (PORSEL)
FPGA Configuration
FPGA configuration is managed by the configuration controller chip. This process
includes reading configuration data from the flash memory, decompressing it if
necessary, transmitting configuration data via the appropriate DATA[] pins, and
handling error conditions.
After POR, the controller determines the user-defined configuration options by
reading its option bits from the flash memory. These options include the configuration
scheme, configuration clock speed, decompression, and configuration page settings.
The option bits are stored at flash address location 0x8000 (word address) and occupy
512-bits or 32-words of memory. These options bits are read using the internal flash
interface and the default 10 MHz internal oscillator.
After obtaining the configuration settings, the configuration controller chip checks if
the FPGA is ready to accept configuration data by monitoring the nSTATUS and
CONF
_DONE lines. When the FPGA is ready (nSTATUS is high and CONF_DONE is low),
the controller begins data transfer using the DCLK and DATA[] output pins. The
controller selects the configuration page to be transmitted to the FPGA by sampling
its PGM[2..0] pins after POR or reset.


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