Xilinx Zynq-7000 - Page 338

Zynq-7000 AP SoC and 7 Series FPGAs MIS v4.1 338
UG586 November 30, 2016
www.xilinx.com
Chapter 2: QDR II+ Memory Interface Solution
SYSCLK_TYPE
This parameter indicates whether the system uses
single-ended system clocks, differential system clocks, or is
driven from an internal clock (No Buffer). Based on the
selected CLK_TYPE, the clocks must be placed on the
correct input ports. For differential clocks,
sys_clk_p/sys_clk_n must be used. For single-ended clocks,
sys_clk_i must be used. For the No Buffer option, sys_clk_i,
which appears in the port list, needs to be driven from the
internal clock.
DIFFERENTIAL
SINGLE_ENDED
NO_BUFFER
REFCLK_TYPE
This parameter indicates whether the system uses
single-ended reference clocks, differential reference clocks,
is driven from an internal clock (No Buffer), or can connect
system clock inputs only (Use System Clock). Based on the
selected CLK_TYPE, the clocks must be placed on the
correct input ports. For differential clocks,
clk_ref_p/clk_ref_n must be used. For single-ended clocks,
clk_ref_i must be used. For the No Buffer option, clk_ref_i,
which appears in port list, needs to be driven from an
internal clock. For the Use System Clock option, clk_ref_i is
connected to the system clock in the user design top
module.
DIFFERENTIAL
SINGLE_ENDED
NO_BUFFER
USE_SYSTEM_CLOCK
DIFF_TERM
This parameter indicates whether differential or
non-differential termination is required for the system clock
inputs.
TRUE
FALSE
CLKIN_PERIOD Input clock period. –
CLKFBOUT_MULT
PLL voltage-controlled oscillator (VCO) multiplier. This
value is set by the MIG tool based on the frequency of
operation.
–
CLKOUT0_DIVIDE,
CLKOUT1_DIVIDE,
CLKOUT2_DIVIDE,
CLKOUT3_DIVIDE
VCO output divisor for PLL outputs. This value is set by the
MIG tool based on the frequency of operation.
–
CLKOUT0_PHASE
Phase of PLL output CLKOUT0. This value is set by the MIG
based on the banks selected for memory interface pins and
the frequency of operation.
–
DIVCLK_DIVIDE
PLLE2 VCO divisor. This value is set by the MIG tool based
on the frequency of operation.
–
SIM_BYPASS_INIT_CAL
This simulation only parameter is used to speed up
simulations.
FAST
OFF
Table 2-12: 7 Series FPGAs QDR II+ SRAM Memory Interface Solution Configurable Parameters (Cont’d)
Parameter Description Options
Send Feedback