Next time I will also release the support for 1D array. ) - Display the std::vector data structureĪt this time there is no more. ) - Display the vectorex::vector2d data structureĭisplayVector_1d(std::vector* ptr_vector, char sTitle =. at(int iRow, int iColumn, T* dst) - return the value in to pointerĭisplayVector_2d(vectorex::vector2d* ptr_vector,char sTitle =. at(int iRow, int iColumn) - return the value in assign(int iRow, int iColumn, T tVar) - Assign value to assign(int iRow, int iColumn, T* ptr_T) - Assign value to from pointer. size_columns() - return the number of columns (1 based index). size_rows() - return the number of rows (1 based index). this function will build the 2d array (with the rows and columns). initialize(int iRows, int iColumns) - You must to call this before using the vector 2d. It can be seen in the hardware schematic that each index of the array is a 16-bit flop and the input address is used to access a particular set of flops.* vectorex::vector2d easily create and work with 2D array bassed on std::vector. The design module accepts an additional input signal which is called addr to access a particular index in the array. In this example, register is an array that has four locations with each having a width of 16-bits. The hardware schematic shows that a 16-bit flop is updated when control logic for writes are active and the current value is returned when control logic is configured for reads. It returns the current data when sel is high and wr is low.Īssign rdata = (sel & ~wr) ? register : 0 The register is written when sel and wr are high on the same clock edge. It contains a 16-bit storage element called register which simply gets updated during writes and returns the current value during reads. In the code shown below, the design module accepts clock, reset and some control signals to read and write into the block. ![]() Verilog vectors are declared using a size range on the left side of the variable name and these get realized into flops that match the size of the variable. Each element in the memory may represent a word and is referenced using a single array index. Storage elements can be modeled using one-dimensional arrays of type reg and is called a memory. RAMs and ROMs are good examples of such memory elements. Memories are digital storage elements that help store a data and information in digital circuits. Ncsim: *W,RNQUIE: Simulation is complete. Reg mem3 // 16-bit wide vector 2D array with rows=4,cols=2 Reg mem2 // 8-bit wide vector array with depth=4 These variables are assigned different values and printed. mem1 is an 8-bit vector, mem2 is an 8-bit array with a depth of 4 (specified by the range ) and mem3 is a 16-bit vector 2D array with 4 rows and 2 columns. The code shown below simply shows how different arrays can be modeled, assigned and accessed. Y3 = 8'haa // Assign 0xaa to rows=0 cols=0 Y3 = 8'hdd // Assign 0xdd to rows=1 cols=2 ![]() Y1 = 0 // Illegal - All elements can't be assigned in a single go Note that a memory of n 1-bit reg is not the same as an n-bit vector reg. An array can be formed for any of the different data-types supported in Verilog. ![]() Reg 圓 // y is a 2D array rows=2,cols=4 each 8-bit wideĪn index for every dimension has to be specified to access a particular element of an array and can be an expression of other variables. ![]() Wire y2 // y is an 8-bit vector net with a depth of 4 Reg y1 // y is an scalar reg array of depth=12, each 1-bit wide Arrays are allowed in Verilog for reg, wire, integer and real data types. Any number of dimensions can be created by specifying an address range after the identifier name and is called a multi-dimensional array. An array declaration of a net or variable can be either scalar or vector.
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