[IC驗證] Memory block randomization constraint
更新日期：2020年9月14日
1. Try to allocate the 4KB SRAM into 5 partitions with each partition having equal size
Ans:
class Allocate_mem;
rand bit[12:0] start_addr[5];
rand int unsigned size;
constraint c_size {
size <= 4096 / 5;
size inside {64, 128, 512 };
}
constraint c_no_overlap {
foreach( start_addr[i] )
if( i < 5 )
( unsigned'(start_addr[i]) + size ) < start_addr [i+1];
else
( unsigned'(start_addr[i]) + size ) < 4096;
}
endclass
2. Try to partition the 4KB SRAM into 5~10 partitions with each partition having equal size
Ans:
class Allocate_mem;
rand bit[12:0] start_addr[];
rand int unsigned number;
rand int unsigned size;
constraint c_num { number >= 5; number <=10; }
constraint c_num_part { start_addr.size() == number; }
constraint c_size {
size <= 4096 / number;
size inside {64, 128, 512 };
}
constraint c_no_overlap {
foreach( start_addr[i] )
if( i != (number-1) )
( unsigned'(start_addr[i]) + size) < start_addr[i+1];
else
( unsigned'(start_addr[i]) +size ) < 4096;
}
endclass
3. Try to partition the 4KB SRAM into 5~10 partitions with each partition having random size
Ans:
class Allocate_mem;
rand bit[12:0] start_addr[];
rand int unsigned number;
rand int unsigned size[];
constraint c_num {
number >= 5; number <=10;
}
constraint c_num_part {
start_addr.size() == number;
size.size() == number;
}
constraint c_sum {
size.sum() <= 4096;
}
constraint c_blk_size {
foreach(size[i]) {
size[i] inside {64, 128, 512 };
}
}
constraint c_no_overlap {
foreach( start_addr[i] )
if( i != (number-1) )
unsigned'(start_addr[i]) + size[i] < start_addr[i+1];
else
unsigned'(start_addr[i]) + size[i] < 4096;
}
endclass
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