Table 3-25:
R
Clock Generation
FPGA Signals for Serial Programming of the Clock Synthesizer Modules (Continued)
Signal
LVDSCLKMOD1_P
LVDSCLOCKMOD1_N
MGT_X0Y1_RCLKP
MGT_X0Y1_RCLKN
PLOAD_2
Description
Clock Synthesizer 1 clock outputs. See Figure 3-8 for a schematic
representation of the clock network on the ML555 board.
ICS8442 parallel load input used for parallel loading of
FPGA Pin (1)
H19
H20
AF4
AF3
AM33
FPGA
In/Out
Input
Input
Input
Input
Output
multiplier and divider switch inputs to the device. A
pushbutton switch is provided on the ML555 board to permit
the user to load the settings into the synthesizer. This signal is
asserted to perform a parallel load operation. For serial
configuration of the ICS8442, this signal should always be
deasserted (inactive).
STROBE_2
ICS8442 serial load input used to load serialized multiplier and
AL34
Output
divisor constants into the ICS8442. Asserted to perform serial to
parallel loading for user-defined clock synthesis. This signal
should be deasserted during the serial data clocking, asserted,
and then deasserted for one clock cycle to complete the serial to
parallel loading of the data into the device.
SDATA_2
This signal contains the ICS8442 serial data input. The serial
AK32
Output
data is provided in the sequence T1, T0, NULL, N1, N0, M8, M7,
M6, M5, M4, M3, M2, M1, and finally M0. The ICS8442 data
sheet provides a serial loading timing diagram and definitions
for serial data bits.
SCLOCK_2
The ICS8442 serial clock input should only be active during
AJ32
Output
serial loading of the synthesizer. The clock should be deasserted
at all other times. Data is clocked into the ICS8442 on the rising
edge of the SCLOCK. The ICS8442 data sheet provides a serial
loading timing diagram and definitions for serial data bits.
LVDSCLKMOD2_P (2)
LVDSCLKMOD2_N (2)
MGT_X0Y0_RCLKP
MGT_X0Y0_RCLKN
The Clock Synthesizer 2 clock outputs go through clock
multiplexer U3, which connects to the FPGA global clock and
the GTP REFCLK inputs. See Figure 3-8 for a schematic
representation of the clock network on the ML555 board.
J20, E4
J21, D4
AL5
AL4
Input
Input
Input
Input
Notes:
1. These FPGA output signals are connected to FPGA bank 13. The reference voltage, V CCO , for this bank is 3.0V. See the ML555 board
schematics on the CD-ROM for additional information. The clock synthesizer clocks are not connected to FPGA bank 13.
2. The LVDSCLKMOD_2 differential clock is connected to a differential clock multiplexer. The output of the multiplexer goes to FPGA
global clock inputs J20(P) and J21(N) and MGT_X0Y5 MGTREFCLK inputs E4 and D4.
Virtex-5 FPGA ML555 Development Kit
UG201 (v1.4) March 10, 2008
69
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