38
VC707 Evaluation Board
UG885 (v1.2) February 1, 2013
Chapter 1:
VC707 Evaluation Board Features
References
Details about the tri-mode Ethernet MAC core are provided in
,
LogiCORE IP
Tri-Mode Ethernet MAC v4.2 User Guide.
The product brief for the Marvell 88E1111 Alaska Gigabit Ethernet Transceiver can be
found at the Marvell website
.
The data sheet can be obtained under NDA with Marvell. Contact information is at the
Marvell website
For more information about the ICS844021 device, go to the Integrated Device Technology
website
ICS844021
.
USB-to-UART Bridge
[
, callout
The VC707 board contains a Silicon Labs CP2103GM USB-to-UART bridge device (U44)
which allows a connection to a host computer with a USB port. The USB cable is supplied
in the VC707 Evaluation Kit (Type-A end to host computer, Type mini-B end to VC707
board connector J17). The CP2103GM is powered by the USB 5V provided by the host PC
when the USB cable is plugged into the USB port on the VC707 board.
Xilinx UART IP is expected to be implemented in the FPGA fabric. The FPGA supports the
USB-to-UART bridge using four signal pins: Transmit (TX), Receive (RX), Request to Send
(RTS), and Clear to Send (CTS).
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 VC707 board.
The USB Connector Pin Assignments and Signal Definitions between J17 and U44 are
listed in
.
X-Ref Target - Figure 1-17
Figure 1-17:
Ethernet 125 MHz SGMII GTX Clock
UG
88
5_c1_17_020612
GND_
S
GMIICLK
VDD_
S
GMIICLK
IC
S8
44021I-01
Clock Gener
a
tor
VDDA
GND_
S
GMIICLK
XTAL_IN
XTAL_OUT
VDD
1
2
3
5
7
6
U2
R
3
20
1.0M
Ω
5%
Q0
4
8
NQ0
VDDA_
S
GMIICLK
C
3
00
1
8
pF 50V
NPO
C
3
01
1
8
pF 50V
NPO
C2
8
0.1
μ
F 25V
X5R
C29
0.1
μ
F 25V
X5R
S
GMIICLK_XTAL_OUT
GND2
GND2
X2
X1
X
3
25.00 MHz
S
GMIICLK_Q0_P
S
GMIICLK_Q0_N
S
GMIICLK_Q0_C_P
S
GMIICLK_Q0_C_N
S
GMIICLK_XTAL_IN
GND_
S
GMIICLK
GND
OE
2
1
3
4