Cypress Semiconductor NoBL CY7C1472V33 Guía de usuario descargar pdf (Pagina 11)

ZestSC1 User Guide

CONFIDENTIAL Page 11 of 57

7 Description

The block diagram of ZestSC1 is shown in Figure 3. It is a desktop board with a Xilinx

Spartan-3 FPGA with up to one million system gates. The FPGA is connected to a host

computer over High Speed USB (12 or 480Mbits/sec) for configuration and data

communication. A synchronous SRAM of either 1 or 8 MBytes stores application data, and

a 32x2 0.1” pitch header can be used for I/O.

Figure 3. ZestSC1 Block Diagram

7.1 USB

ZestSC1 is a USB device and needs to be connected to a USB host computer. It can draw

power from the USB cable or from a mains power adapter, according to the position of

J6. The USB port may be either Full speed 12Mbps (USB V1.1 or 2.0) or High speed

480Mbps (USB V2.0).

The USB controller is the Cypress EZ-USB FX2 USB Microcontroller [1]. It includes an

8051 microcontroller that is used for enumeration and board management firmware. The

8051 address and data buses are connected to the FPGA. The USB controller is

implemented entirely in hardware. The ZestSC1 comes fitted with an EEPROM containing

firmware to communicate with the supplied host driver. It is strongly recommended that

this firmware is not modified and that the supplied host driver and FPGA cores are used

for all designs. Failure to do so may result in damage to the hardware.

The main method for data communication between the FPGA and USB is by the FX2’s

FIFO interface. This can operate with its data bus 8 or 16 bits wide and at a frequency of

48MHz giving a maximum burst data rate of 96 MBytes/sec.. It is used for configuring

the FPGA from the host computer and for data communications between the FPGA and

host computer. The FX2 Serial Interface Engine SIE, which controls USB transfers, uses

USB

Controller

FPGA

Spartan-3

1000

ZBT SRAM

8MBytes

49 pins of user I/O on 0.1” header

8 LEDs

16 18

Streamin

8 Re

isters

8 Fla

Interru

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 56 57

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Cypress Semiconductor NoBL CY7C1472V33 Guía de usuario Pagina 11