Digilent 410-182P-KIT Uživatelský manuál stáhnout pdf (Strana 2)

Nexys3 Reference Manual

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Configuration

After power-on, the Spartan-6 FPGA board must be configured (or programmed) before it can perform

any functions. The FPGA can be configured in one of four ways: a PC can use the Adept "USB Prog"

port to program the FPGA any time power is on; a configuration file stored in the non-volatile parallel

PCM device can be transferred to the FPGA at power-on using the BPI-UP port; a file stored in the

non-volatile serial (SPI) PCM device can be transferred to the FPGA using the SPI port; or a

programming file can be transferred from a USB memory stick attached to the USB HID port. An on-

board "mode" jumper (J8) selects between the programming modes as shown in the J8 Mode legend

in the figure below. JTAG Mode can be accessed at any time without changing jumpers.

JTAG

Port

USB

Controller

Micron SPI Quad

mode PCM (P5Q)

1x6 JTAG

Header

SPI

Port

Micro-AB USB

Connector

Adept “USB Prog” Port

Spartan6

Done

PIC24

Type A USB

Connector

Host Port

Serial

Prog. Port

Micron Parallel

PCM (P8P)

BPI

Port

Programming

Mode

SLV Serial

SPI

BPI UP

M0 M1

6-pin JTAG

Header (J7)

Prog

Programming files are stored in SRAM-based memory cells within the FPGA. This data defines the

FPGA’s logic functions and circuit connections, and it remains valid until it is erased by removing

board power, by pressing the reset button attached to the PROG input, or by writing a new

configuration file using the JTAG port.

FPGA configuration files transferred via the JTAG port use the .bin or .svf file types, files transferred

from a USB stick use the .bit file type, and BPI or SPI programming files can use .bit, .bin, or .mcs

types. The ISE/WebPack or EDK software from Xilinx can create bit, svf, bin, or mcs files from VHDL,

Verilog, or schematic-based source files (EDK is used for MicroBlaze™ embedded processor-based

designs). Digilent's Adept software or Xilinx's iMPACT software can be used to program the FPGA or

ROMs using the Adept USB port.

During JTAG programming, a .bit or .svf file is transferred from the PC to the FPGA using the Adept

USB port. When programming a non-volatile PCM device, a .bit, .bin, or .mcs file is transferred to the

in a two-step process. First, the FPGA is programmed with a circuit that can program PCM devices,

and then data is transferred to the PCM device via the FPGA circuit (this complexity is hidden from

the user – a simple “program ROM” interface is presented by the programming software. Note the

PCM devices are next-generation Flash ROM devices, and they are often referred to as "Flash" or

"ROM" memory). After the PCM device has been programmed, it can automatically configure the

FPGA at a subsequent power-on or reset event as determined by the J8 jumper setting. Programming

files stored in the PCM devices will remain until they are overwritten, regardless of power-cycle

events.

The FPGA can be programmed from a memory stick attached to the USB-HID port if the stick

contains a single .bit configuration file in the root directory, the J8 Programming Mode jumper is set to

1 2 3 4 5 6 7 ... 21 22

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