针对 my_union 的分配使用的是“a”,而此联合的读取结果针对 out1 和 out2 则分别使用“a”和“b”。 联合分两种类型:打包 (packed) 和解包 (unpacked)。在上述示例中,我们指定的是打包联合。默认情况下,如果不指定类型,编译器将假定它采用解包联合。 打包联合与解包联合的差别在于,在打包联合中,其中所有标识...
A valid data type for a net shall be one of the following: A 4-state integral type, including a packed array or packed structure. A fixed-size unpacked array or unpacked structure, where each element has a valid data type for a net. A lexical restriction applies to the use of the reg...
SystemVerilog有三种类型的共用体:简单共用体(simple union),压缩共用体(packed union),标签共用体(tagged union)。只有压缩共用体是可综合的。 压缩共用体要求共用体内所有表示都是比特数(number of bits)相同的压缩类型。压缩类型包括位向量(bit-vector (packed arrays)),整数类型(integer types)和压缩结构体(packe...
Verilog -vs- SystemVerilog race conditions Scheduling of new SystemVerilog commands * Blocking & Nonblocking Assignment Details * Mixed RTL & Gate simulationsStructs, Unions, Packed & Unpacked Arrays - Packed & unpacked arrays, unions and structs allow greater abstraction and more concise coding. The...
- Packed & unpacked arrays, unions and structs allow greater abstraction and more concise coding. The new dynamic array types facilitate behavioral modeling and assist in the development of verification environments. Semaphores and mailboxes are sometimes used in advanced verification methodologies such as...
C macro SV_PACKED_DATA_NELEMS(width) Convert from bits to number of elements typedef unsigned int svBitVecVal; /* (a chunk of) packed bit array */ typedef struct { unsigned int aval; unsigned int bval;} svLogicVecVal; /* (a chunk of) packed logic array */ ...
Open arrays (see Argument Passing below) with both packed and unpacked parts. Return Value and Argument Data Types Result types of both imported and exported functions are restricted to small values. Small values include: void, byte, shortint, int, longint, real, shortreal, chandle, and stri...