Detailed Description
GTP Transceiver Clock Input SMAs
[ Figure 1-2 , callout 18 ]
The SP623 board provides differential SMA connectors that can be used for connecting an
external function generator to all GTP transceiver reference clock inputs of the FPGA. The
FPGA reference clock pins are connected to the SMA connectors as shown in Table 1-13 .
Table 1-13:
GTP Transceiver Clock Inputs to the FPGA
FPGA Pin
B10
A10
D11
C11
D15
C15
B16
A16
AE11
AF11
AC12
AD12
AC16
AD16
AE17
AF17
Net Name
101_REFCLK0_P
101_REFCLK0_N
101_REFCLK1_P
101_REFCLK1_N
123_REFCLK0_P
123_REFCLK0_N
123_REFCLK1_P
123_REFCLK1_N
245_REFCLK0_P
245_REFCLK0_N
245_REFCLK1_P
245_REFCLK1_N
267_REFCLK0_P
267_REFCLK0_N
267_REFCLK1_P
267_REFCLK1_N
SMA Connector
J59
J60
J49
J50
J70
J61
J72
J71
J80
J81
J82
J83
J92
J93
J94
J95
USB to UART Bridge
[ Figure 1-2 , callout 19 ]
Communications between the SP623 board and a host computer are through a USB Mini-B
cable connected to J9. Control is provided by U26, a USB to UART bridge (Silicon
Laboratories CP2103). Table 1-14 lists the pin assignments and signals for the USB
connector J9.
Table 1-14:
USB Mini-B Connector Pin Assignments and Signals
J9 Pin
1
2
3
4
Signal Name
VBUS
USB_DATA_N
USB_DATA_P
GROUND
Description
+5V from host system (not used)
Bidirectional differential serial data (N-side)
Bidirectional differential serial data (P-side)
Signal ground
SP623 Board User Guide
UG751 (v1.1) September 15, 2010
23
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