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ML630 Board User Guide
www.xilinx.com
23
UG828 (v1.0) September 28, 2011
Detailed Description
FPGA U2 User GPIO Header
Figure 1-2
callout [28]
A standard 2 x 6, 100-mil pitch header (J103) brings out six FPGA I/Os for test purposes.
Table 1-14
lists these pins. J103 odd pin numbers are wired to GND (ground).
FPGA U2 USB to UART Bridge
Figure 1-2
callout [29]
Communications between the ML630 board FPGA U2 and a host computer are
accomplished through a USB cable connected to J106. Control is provided by U79, a USB to
UART bridge (Silicon Laboratories CP2103).
Table 1-15
lists the pin assignments and
signals for the USB connector J106.
The CP2103 supports an I/O voltage range of 2.5V on the ML630 board. The connections
between FPGA U2 and CP2103 should use the LVCMOS25 I/O standard. UART IP (for
example, Xilinx® XPS UART Lite) must be implemented in the FPGA logic. FPGA U2
supports the USB to UART bridge using four signal pins:
•
Transmit (TX)
•
Receive (RX)
•
Request to Send (RTS)
•
Clear to Send (CTS)
Connections of these signals between the FPGA and the CP2103 at U79 are listed in
Table 1-16
.
Table 1-14:
FPGA U2 User GPIO Header J103
FPGA U1 Pin
Net Name
J103 Pin
J35
U2_USER_IO_1
2
K35
U2_USER_IO_2
4
D35
U2_USER_IO_3
6
E35
U2_USER_IO_4
8
P35
U2_USER_IO_5
10
P34
U2_USER_IO_6
12
Table 1-15:
J106 USB Mini-B Connector Pin Assignments and Signals
J106 Pin
Signal Name
Description
1
VBUS
+5V from host system
2
U2_USB_D_N
Bidirectional differential serial data (N-side)
3
U2_USB_D_P
Bidirectional differential serial data (P-side)
4
ID
Not used8