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Clock Generation
PCI Express applications can utilize the system board’s 100 MHz clock input on the GTP
MGTREFCLK clock input or synthesize a 100 MHz clock using the clock synthesizer, a
DCM, and GTP clocking resources. SATA applications must synthesize a 150 MHz clock
using Clock Synthesizer 2. Gigabit Ethernet applications can use either the 125 MHz
oscillator or a synthesized clock. Fibre channel applications must synthesize either a
53.125 MHz or a 106.25 MHz clock. When using the SFP connectors for Fibre channel and
Gigabit Ethernet, the REFCLK for the SFP must be either Fibre channel or Ethernet speed,
and the SMA connectors should be used to route either the Fibre channel or Ethernet
interface to an offboard connector interface.
The SMA connectors are not AC coupled on the ML555 board, so either internal GTP AC
coupling must be enabled or external AC coupling might be required for interfaces to
offboard transceivers to be electrically compatible.
Parallel Bus Clocking (PCI Operation)
The PCI specification calls for the PCI bus clock, sourced from the motherboard PCI slot, to
have one load on the add-in cards. The LogiCORE solutions for PCI and PCI-X designs,
depending upon bus mode and frequency, require that the PCI bus clock enter the FPGA
on a specific clock pin (refer to Table 1-1 ).
The ML555 board PCI bus clock is implemented as follows:
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The PCI bus clock (signal CLK_FROM_EDGE) enters the board on PCI edge
connector P1 pin B16.
The clock is then routed in a “Y” topology to two parallel resistors, R2 and R242.
The output side of R2 (signal PCIBUSCLK1) is routed to FPGA pin L34 (the regional
clock pin of FPGA).
The output side of R242 (signal PCIBUSCLK2) is routed to FPGA pin J14 (the global
clock pin of FPGA).
If full electrical compliance is required, the designer has the option to remove one of the
two resistors (R2 or R242). As shipped, the ML555 board has both resistors installed.
Virtex-5 FPGA ML555 Development Kit
UG201 (v1.4) March 10, 2008
59
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相关PDF资料
HW-V5-ML561-UNI-G
EVALUATION PLATFORM VIRTEX-5
I-JET
JTAG ARM DEBUGGING PROBE
IAC24A
INPUT MODULE AC 5MA 24VDC
IAC5EQ
INPUT MODULE AC 10MA 5VDC
IB8RM
SURGE SUPP 8OUT 12'CORD W/REMOTE
IBAR12-20T
SURGE SUPPRSSR 20A 12OUT RACKMNT
IBAR12/20ULTRA
SURGE SUPPRSSR 20A 12OUT RACKMNT
IBAR12ULTRA
SURGE SUPPRSSR 15A 12OUT RACKMNT
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