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How do you do bit slicing in Verilog?
When accessing a range of a Verilog array slice, we can specify a variable slice by using the [start+: increment width] and [start-: decrement width] notations. They are simpler than needing to calculate the exact start and end indices when selecting a variable slice.
What is meant by bit slice?
Bit slicing is a technique for constructing a processor from modules of processors of smaller bit width, for the purpose of increasing the word length; in theory to make an arbitrary n-bit CPU. Each of these component modules processes one bit field or “slice” of an operand.
What is a bit in Verilog?
Integer and Real Types Verilog’s variable types are four-state: each bit is 0,1,X or Z. SystemVerilog introduces new two-state data types, where each bit is 0 or 1 only. Note that, unlike in C, SystemVerilog specifies the number of bits for the fixed-width types.
What is the difference between SystemVerilog packed and unpacked array?
Packed vs Unpacked SystemVerilog Arrays Packed array refers to dimensions declared after the type and before the data identifier name. Unpacked array refers to the dimensions declared after the data identifier name.
What are bit-slice microprocessors?
A bit-slice microprocessor (BSM) is a microprocessor designed as a module with the primary purpose of being able to assemble multiple identical such microprocessors to form a larger processor of some desired word size.
What is bit sliced datapath?
Bit slicing is a method of combining processor modules to multiply the word length. In a bit-sliced processor, each module contains an ALU (arithmetic-logic unit) usually capable of handling a 4-bit field.
What is real in Verilog?
real is typically a 64 bit IEEE floating point number. realtime is of type real used for storing time as a floating point value. reg is by default a one bit unsigned value. The reg variable data type may have a modifier signed, and may have may bits by using the vector modifier [msb:lsb].
What is the difference between logic and Reg?
System verilog added this additional datatype extends the rand eg type so it can be driven by a single driver such as gate or module. The main difference between logic dataype and reg/wire is that a logic can be driven by both continuous assignment or blocking/non blocking assignment.
How to do variable bit slicing in Verilog?
Serialize the data read and only deserialize the number of bits specified by the reqlen. On the next request you just deserialize the next set of bits. This is very easy to do and doesn’t require complex barrel shifting operations or variable bit slicing (which isn’t possible to do in hardware).
What does slice mean in a SystemVerilog array?
SystemVerilog uses the term slice to refer to a selection of one or more contiguous elements of an array. bit [31:0] packet_type_A [7:0]; //array of 8 elements of width 32bit bit [31:0] packet_type_B [1:0]; //array of 2 elements of width 32bit packet_type_B = packet_type_A [5:4]; //assigning 2 elements of array packet_type_A to packet_type_B
How to write generic logic for bit selection?
SystemVerilog uses the term slice to refer to a selection of one or more contiguous elements of an array. How to write generic logic for bit selection? Using +: and -: Notation part selection generic logic can be written. 8 -> 8 elements up from 0 , so end point is 7.
How to write lexical rules in Verilog language?
3.2. Lexical rules ¶ Verilog is case sensitive language i.e. upper and lower case letters have different meanings. Also, Verilog is free formatting language (i.e. spaces can be added freely), but we use the python like approach to write the codes, as it is clear and readable.