KC724 GTX Transceiver Characterization Board
29
UG932 (v2.2) October 10, 2014
Detailed Description
The bridge device also provides as many as 4 GPIO signals that can be defined for status
and control information (
A royalty-free software driver named Virtual COM Port (VCP) is available from Silicon
Laboratories. This driver permits the CP2103 USB-to-UART bridge to appear as a COM
port to the host computer communications application software (for example,
HyperTerminal or TeraTerm). The VCP driver must be installed on the host computer prior
to establishing communications with the KC724 board.
FPGA Mezzanine Card HPC Interface
Callout
The KC724 board features two high pin count (HPC) connectors as defined by the VITA
57.1 FPGA Mezzanine card (FMC) specification. The FMC HPC connector is a 10 x 40
position socket. See
Appendix C, VITA 57.1 FMC Connector Pinouts
for a cross-reference
of signal names to pin coordinates.
FMC1 HPC connector provides connectivity for:
•
69 differential user defined pairs:
•
34 LA pairs
•
18 HA pairs
•
17 HB pairs
•
2 differential clocks
FMC2 HPC connector JA3 provides connectivity for:
•
80 differential user defined pairs:
•
34 LA pairs
•
24 HA pairs
•
22 HB pairs
•
4 differential clocks
Note:
The V
ADJ
voltage for the FMC HPC connectors on the KC724 board tracks the I/O voltage of
the FPGA banks that each FMC interface maps to. FMC1 tracks VCCO_HP. FMC2 tracks VCCO_HR.
Table 1-16:
CP2103 USB-to-UART Bridge User GPIO
FPGA (U1)
Schematic Net
Name
Device (U34)
Pin
Function
Direction
IOSTANDARD
Pin
Function
Direction
L17
SelectIO™
In/Out
LVCMOS18
USB_GPIO_0
19
GPIO
In/Out
H19
SelectIO
In/Out
LVCMOS18
USB_GPIO_1
18
GPIO
In/Out
J19
SelectIO
In/Out
LVCMOS18
USB_GPIO_2
17
GPIO
In/Out
H17
SelectIO
In/Out
LVCMOS18
USB_GPIO_3
16
GPIO
In/Out
