An aim of ESL modelling was to be able to easily replace parts of the high-level model with greater detail where necessary. So-called transactors are commonly needed at the boundaries.
// Write transactor 4/P handshake
b_putbyte(char d)
{
while(ack) do wait(1, SC_NS);
data = d;
settle();
req = 1;
while(!ack) do wait(1, SC_NS);
req = 0;
}
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// Read transactor 4/P handshake
char b_getbyte()
{
while(!req) do wait(1, SC_NS);
char r = data;
ack = 1;
while(req) do wait(1, SC_NS);
ack = 0;
return r;
}
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Example blocking transactor: converts from transaction to pin-level modelling.
See working SystemC versions in the `Toy ESL' practical material.