Digilent 410-178P-KIT Bedienungsanleitung PDF herunterladen (Seite 16)

Atlys Reference Manual

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Spartan-6

P17

PIC24FJ192

K_CLK

N15

“HOST”J13

N18

P18

K_DAT

M_CLK

M_DAT

R13

R15

DIN

CLK

FPGA Serial

programming

PS/2 Keyboard

PS/2 Mouse

DCMs provide the four phases of the input frequency (0º, 90º, 180º, and 270º), a divided clock that

can be the input clock divided by any integer from 2 to 16 or 1.5, 2.5, 3.5... 7.5, and two antiphase

clock outputs that can be multiplied by any integer from 2 to 32 and simultaneously divided by any

integer from 1 to 32.

PLLs use VCOs that can be programmed to generate frequencies in the 400MHz to 1080MHz range

by setting three sets of programmable dividers during FPAG configuration. VCO outputs have eight

equally-spaced outputs (0º, 45º, 90º, 135º, 180º, 225º, 270º, and 315º) that can be divided by any

integer between 1 and 128.

USB-UART Bridge (Serial Port)

The Atlys includes an EXAR USB-UART bridge to allow PC applications to communicate with the

board using a COM port. Free drivers allow COM-based (i.e., serial port) traffic on the PC to be

seamlessly transferred to the Atlys

board using the USB port at J17

marked UART. The EXAR part

delivers the data to the Spartan-6

using a two-wire serial port with

software flow control (XON/XOFF).

Free Windows and Linux drivers can

be downloaded from www.exar.com. Typing the EXAR part number “XR21V1410” into the search box

will provide a link to the XR21V1410’s land page, where links for current drivers can be found. After

the drivers are installed, I/O commands from the PC directed to the COM port will produce serial data

traffic on the A16 and B16 FPGA pins.

USB HID Host

A Microchip PIC24FJ192 microcontroller provides the Atlys board with USB HID host capability.

Firmware in the MCU microcontroller can drive a mouse or a keyboard attached to the type A USB

connector at J13 labeled "Host".

Hub support is not currently

available, so only a single mouse

or a single keyboard can be used.

The PIC24 drives four signals into

the FPGA – two are used as a

keyboard port following the

keyboard PS/2 protocol, and two

are used as a mouse port

following the mouse PS/2

protocol.

Two PIC24 I/O pins are also

connected to the FPGA’s two-wire

serial programming port, so the FPGA can be programmed from a file stored on a USB memory stick.

To program the FPGA, attach a memory stick containing a single .bit programming file in the root

directory, load JP11, and cycle board power. This will cause the PIC processor to program the FPGA,

and any incorrect bit files will automatically be rejected.

A16

TXD

B16

Micro-USB

J17

“UART”

RXD

200Ω

Spartan-6

XR21V1410

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 22

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