HW-V5-ML555-G【PDF 51/108 页】BOARD EVAL FOR VIRTEX-5 ML555

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Table 3-16:

R

RS-232 Interface Signal Names and Pin Assignments (Continued)

Universal Serial Bus Port

Signal Name

USB_RST_B

FPGA In/Out

In/Out

Description

Active-Low USB Reset (must be held Low for 15 μ s to

FPGA Pin Number (1)

J15

initiate a reset to the USB controller)

USB_SUSPEND_B

In

USB Suspend (output from USB port driven High when

L16

the USB controller enters the suspend state)

Notes:

1. These signals are connected to FPGA bank 1. The FPGA reference voltage, V CCO , for this bank is 2.5V. See the ML555 board

schematics on the CD-ROM for additional information.

Figure 3-7 is a high-level block diagram of the RS-232 to USB 2.0 interface.

U5

U4

U10

USB_D-

5

28

USB_DTR_O_B

7

14

USB_DTR_B

L15

USB_VBUS 8

27

26

USB_DSR_I_B

USB_TX_O

3

8

18

13

USB_DSR_B

USB_TX

K16

L20

2 1

3 4

J1

GND

USB_D+

3

4

25

24

23

9

USB_RX_I

USB_RTS_O_B

USB_CTS_I_B

USB_RST_I_B

4

9

5

1

17

12

16

20

USB_RX

USB_RTS_B

USB_CTS_B

USB_RST_B

K21

L21

J22

J15

Virtex-5

FPGA

CP2102

11

USB_SUSPEND_O_B

6

MAX3008

15 USB_SUSPEND_B L16

UG201_c3_07_092706

Figure 3-7:

RS-232 Interface Block Diagram

The USB 2.0 cable is not included in the kit. A USB Type A to USB Type B interface cable is

required for ML555 to PC serial communications over the USB interface.

The Platform USB programming cable, included with the Virtex-5 LXT ML555 FPGA

Development Kit for PCI Express, PCI-X, and PCI interfaces, contains a USB Type A to USB

Type B interface cable. If the Platform USB programming cable is not being used to

program devices on the ML555 board, the cable could be used for USB communications

between the ML555 board and a host computer.

USB to UART Bridge

The ML555 board contains a CP2102 USB to UART bridge circuit from Silicon

Laboratories. The USB 2.0 interface is provided external to the board while the FPGA

utilizes a UART interface. The USB interface cable is not provided with the ML555

development kit. USB interface cables are available at many office supply and computer

peripheral consumer stores. A USB B-to-A cable is required to interface a PC USB “A” port

to the ML555 USB “B” port.

Royalty-free Virtual COM Port (VCP) device drivers are provided by Silicon Laboratories

to permit the CP2102 USB to UART bridge to appear as a COM port to the personal

computer (PC) application. The UART interface side of the bridge implements all RS-232

interface signals, including control and handshaking signals. The VCP device driver must

be installed on the PC prior to attempting to establish communications with the ML555

board. The device driver is on the ML555 CD-ROM. The driver allows the PC USB port to

Virtex-5 FPGA ML555 Development Kit

UG201 (v1.4) March 10, 2008

51

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