Xilinx VC709 User Manual

VC709 Evaluation Board www.xilinx.com 41
UG887 (v1.0) February 4, 2013
Feature Descriptions
Silicon Labs provides royalty-free Virtual COM Port (VCP) drivers for the host computer.
These drivers permit the CP2103GM USB-to-UART bridge to appear as a COM port to
communications application software (for example, TeraTerm or HyperTerm) that runs on
the host computer. The VCP device drivers must be installed on the host PC prior to
establishing communications with the VC709 board.
The USB Connector pin assignments and signal definitions between J17 and U44 are listed
in Table 1-15.
Table 1-16 shows the USB connections between the FPGA and the UART.
Refer to the Silicon Labs website for technical information on the CP2103GM and the VCP
drivers (Silicon Labs: www.silabs.com
).
I
2
C Bus
[Figure 1-2, callout 14, 15]
The VC709 board implements a single I
2
C port on the FPGA (IIC_SDA_MAIN, pin AU32;
IIC_SDA_SCL, pin AT35), which is routed through a TI Semiconductor PCA9548A 1-to-8
channel I
2
C bus switch (U52). The bus switch can operate at speeds up to 400 kHz.
The bus switch I
2
C address is 0x74 (0b01110100) and must be addressed and configured
to select the desired downstream device.
The four SFP+ connectors SFP1 (P3), SFP2 (P2), SFP3 (P4), and SFP4 (P5) are addressed
through a secondary PCA9546A 1-to-4 channel I
2
C bus switch (U14). The VC709 board I
2
C
bus topology is shown in Figure 1-16.
Table 1-15: USB Connector J17 Pin Assignments and Signal Definitions
USB Connector (J17)
Net Name Description
CP2103GM (U44)
Pin Name Pin Name
1 VBUS USB_UART_VBUS +5V VBUS powered
7REGIN
8VBUS
2 D_N USB_D_N Bidirectional differential serial data (N-side) 4 D –
3 D_P USB_D_P Bidirectional differential serial data (P-side) 3 D +
4 GND USB_UART_GND Signal ground
2GND1
29 CNR_GND
Table 1-16: FPGA to UART Connections
FPGA (U1)
Net Name
CP2103GM UART (U44)
Pin UART Function Pin UART Function
AR34 RTS, output USB_UART_CTS 22 CTS, input
AT32 CTS, input USB_UART_RTS 23 RTS, output
AU36 TX, data out USB_UART_RX 24 RXD, data in
AU33 RX, data in USB_UART_TX 25 TXD, data out

Xilinx VC709 Specifications

General

Brand	Xilinx
Model	VC709
Category	Motherboard
Language	English