Xilinx Zynq-7000 User Manual page 293

• Reference Clock – This option selects the clock type (Single-Ended, Differential, No
Buffer, or Use System Clock) for the clk_ref signal pair. The Use System Clock option
appears when the input frequency is between 199 and 200 MHz (that is, the Input Clock
Period is between 5,025 ps (199 MHz) and 4,975 ps (201 MHz). When the No Buffer
option is selected, IBUF primitives are not instantiated in RTL code and pins are not
allocated for the reference clock.
If the designs generated from MIG tool for the No Buffer option are implemented
without performing changes, designs can fail in implementation due to IBUFs not
instantiated for the ref_clk_i signal. So for No Buffer scenarios, ref_clk_i signal
needs to be connected to an internal clock.
• System Reset Polarity – The polarity for system reset (sys_rst) can be selected. If the
option is selected as active-Low, the parameter RST_ACT_LOW is set to 1 and if set to
active-High the parameter RST_ACT_LOW is set to 0.
• Debug Signals Control – Selecting this option enables calibration status and user port
signals to be port mapped to the ILA and VIO in the example_top module. This helps
in monitoring traffic on the user interface port with the Vivado Design Suite debug
feature. Deselecting the Debug Signals Control option leaves the debug signals
unconnected in the example_top module and no ILA/VIO modules are generated by
the IP catalog. Additionally, the debug port is always disabled for functional
simulations.
• Sample Data Depth – This option selects the Sample Data depth for the ILA module
used in the Vivado debug logic. This option can be selected when the Debug Signals
for Memory Controller option is ON.
• Internal V
REF
use of the V
rates of 800 Mb/s or below.
Click Next to display the Extended FPGA Options page.
Zynq-7000 AP SoC and 7 Series FPGAs MIS v4.1
UG586 November 30, 2016
Selection – Internal V
pins for normal I/O usage. Internal V
REF
www.xilinx.com
Chapter 2: QDR II+ Memory Interface Solution
can be used for data group bytes to allow the
REF
should only be used for data
REF
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