R
Clock Generation
Global Clock Inputs
Global clock inputs to the FPGA are summarized in Table 3-19 . Global clocks are
connected to FPGA bank 3.
Table 3-19:
FPGA Global Clock Inputs
FPGA Pins
L18
K17
H18
H17
H19
H20
J20 (4)
J21 (4)
G16
G15
Signal Name
LVPECL_200M_N
LVPECL_200M_P
SMA_GCLKN (2,5)
SMA_GCLKP (2,5)
LVDSCLKMOD1_P
LVDSCLKMOD1_N
SATA_MGT_GCLKP
SATA_MGT_GCLKN
SFP_MGT_GCLKN
SFP_MGT_GCLKP
Clock Source
200 MHz LVPECL oscillator Y3
200 MHz LVPECL oscillator Y3
SMA Connector J11
SMA Connector J10 (3)
Clock Synthesizer 1
Clock Synthesizer 1
Selectable: 125 MHz Oscillator or Clock Synthesizer 2
Selectable: 125 MHz Oscillator or Clock Synthesizer 2
125 MHz LVDS Oscillator
125 MHz LVDS Oscillator
L19
FPGA_GCLK_30MHZ (3) 30 MHz Oscillator
H14
J19
J14
J16 (2)
J17 (2)
H15 (4)
P0_RCLK1 (3)
P1_RCLK1 (3)
PCIBUSCLK2 (3)
PCIE_GCLK_P
PCIE_GCLK_N
SATA_MGT_CLKSEL
Port 0 Ethernet PHY Receive Clock (if the EPHY daughtercard is installed)
Port 1 Ethernet PHY Receive Clock (if the EPHY daughtercard is installed)
P1-B16 active only when the ML555 board is installed in a PCI bus
connector. Not active when the ML555 board is installed in a PCI Express
connector.
Global clock input available only if an ICS874003-02 PCI Express clock jitter
attenuator circuit is installed on the ML555 board at location U16 (not the
default board configuration). This clock is 100, 125, or 250 MHz as selected
by the CPLD controls. The default is a 250 MHz spread spectrum clock
generated from the add-in card PCI Express input clock on connector P13.
Global clock input available only if an ICS874003-02 PCI Express clock jitter
attenuator circuit is installed on the ML555 board at location U16 (this is not
the default board configuration). This clock is 100, 125, or 250 MHz as
selected by the CPLD controls. The default is a 250 MHz spread spectrum
clock generated from the add-in card input clock for PCI Express operation
on connector P13.
FPGA output used to select the fixed 125 MHz oscillator or the Clock
Synthesizer 2 output to be routed to GTP_DUAL tile X0Y5 MGTREFCLK
and SMA_MGT_GCLK global clock inputs. The ML555 board has a 4.7K Ω
pull-up resistor to 2.5V to provide default selection of clock synthesizer 2 as
the output of the Clock Mux block shown in Figure 3-8 and Figure 3-9 .
Virtex-5 FPGA ML555 Development Kit
UG201 (v1.4) March 10, 2008
57
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