EPCS16 データシートの表示（PDF） - Unspecified

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EPCS16

Serial Configuration (EPCS) Devices

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Functional Description

■ Enables the Nios processor to access unused flash memory through AS memory

interface

■ Reprogrammable memory with more than 100,000 erase or program cycles

■ Write protection support for memory sectors using status register bits

■ In-system programming (ISP) support with SRunner software driver

■ ISP support with USB-Blaster, EthernetBlaster, or ByteBlaster II download cables

■ Additional programming support with the APU and programming hardware

from BP Microsystems, System General, and other vendors

■ By default, the memory array is erased and the bits are set to 1

Functional Description

To configure a system using an SRAM-based device, each time you power on the

device, you must load the configuration data. The EPCS device is a flash memory

device that can store configuration data that you use for FPGA configuration purpose

after power on. You can use the EPCS device on all FPGA that support AS x1

configuration scheme.

For an 8-pin SOIC package, you can migrate vertically from the EPCS1 device to the

EPCS4 or EPCS16 device. For a 16-pin SOIC package, you can migrate vertically from

the EPCS64 device to the EPCS128 device.

With the new data decompression feature supported, you can determine using which

EPCS device to store the configuration data for configuring your FPGA.

Example 1 shows how you can calculate the compression ratio to determine which

EPCS device is suitable for the FPGA.

Example 1. Compression Ratio Calculation

EP4SGX530 = 189,000,000 bits

EPCS128 = 134,217,728 bits

Preliminary data indicates that compression typically reduces the

configuration bitstream size by 35% to 55%. Assume worst case that is 35%

decompression.

189,000,000 bits x 0.65 = 122,850,000 bits

The EPCS128 device is suitable.

f For more information about the FPGA decompression feature, refer to the

configuration chapter in the appropriate device handbook.

Serial Configuration (EPCS) Devices Datasheet

April 2014 Altera Corporation

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