In Synplify and Synplify Pro, it also specifies the Xilinx fmap or hmap primitive in. All inferred registers are triplicate, since the attribute is applied globally. syndiffio Attribute, Controls the inference of I/O buffers.
Synplify Pro infers RAM in registers and LUTs. Register Triplication of Pipeline Register with Control Logic Associated with Single Port RAMĮxample 18: Register triplication of output register with control logic associated with Dual Port RAM, use of syn_keep and syn_preserve attributes. Consequently, setting the correct goals in the Synplify Pro tool is an essential consideration with regard to obtaining the best results. HDL: module test31_maccrom_synpreserve_globtmr(clk,A,B,C,out,addr)/* synthesis syn_radhardlevel=tmr */ Indeed, the Synplify Pro tool is timing-driven, which means that it simultaneously optimizes for area and performance, but it stops as soon as the timing constraints are met. Synplify Pro triplicates the output register on which the syn_preserve attribute is applied. Please see (Xilinx Answer 244) for details of instantiating Xilinx-specific cells.
44 44 Specification of memory types recognized by Synplify Pro attribute. You can instantiate RAM/ROM cells by using the Xilinx family library supplied with Synplify. Global TMR Attribute in FDC on Three ModulesĮxample 16: Register triplication with syn_preserve attribute on registers associated with MACC_PC_BA_ROM logic. 1 ECE 448 FPGA and ASIC Design with VHDL Lecture 10 Memories (RAM/ROM). Module t3 (clk2, rst, set, en, din3, dout3) įDC: define_global_attribute įigure 15. Module t2 (clk1, rst, set, din2, dout2)/* synthesis syn_radhardlevel = “none” */ TIming Closure User Guide 33 UG612 (v 13. Input clk0,clk1,clk2,rst,set,en,din1,din2,din3 Īlways clk0 or posedge rst or posedge set) Synchronous Elements Synchronous elements include: Flip Flops Latches Distributed RAM Block RAM Distributed ROM ISERDES OSERDES PPC405 PPC440 MULT18X18 DSP48. HDL: module test9_3modules_fdcglobtmr(clk0,clk1,clk2,rst,set,en,din1, dout1,din2,dout2,din3,dout3) Synplify Pro triplicates the registers in t1 and t3 module, but it does not triplicate registers in the t2 module. Register triplication with syn_preserve attribute on Few Registers Associated with MACC LogicĮxample 15: Global TMR attribute in FDC on three modules, but disable TMR attribute on one module in RTL. Enable logic is implemented using voter logic output.Īrchitecture behaviour of test39_sle_reseten_globtmr isĪttribute syn_radhardlevel of behaviour: architecture is “tmr” ĮLSIF (as_ld_n = '0' and p_in = '1') THENįigure 14.
Asynchronous set logic is implemented using latch and flop, and triplicated. Synplify Pro triplicates each register and inserts majority voting logic at register outputs. Flop with Asynchronous Reset, Asynchronous Set, and Enable Control Signal applied in VerilogĮxample 6: Flop with Asynchronous Reset, Asynchronous Set, and Enable Control Signal (TMR attribute globally applied in VHDL)
Synplify pro rom inferencing manual#
The manual is located in the "doc" directory of your installation.Figure 5. of memory types recognized by Synplify Pro SIGNAL memory : vectorarray.
In the same manual, you can also find sections on RAM and ROM inference. ECE 448 Lecture 10 Memories: RAM, ROM ECE 448 FPGA and ASIC Design with VHDL. You want to look at the Synopsys FPGA Synthesis Reference Manual. There are multiple ways to achieve what you want (in HDL, in constraint file, etc).
Synplify pro rom inferencing how to#
Synplify has a good FPGA reference manual with code examples and constraints for how to get the behavior you desire.