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.
// Untimed write transactor 4/P handshake b_putbyte(char d) { while(!ack) do wait(10, SC_NS); data = d; settle(); req = 1; while(ack) do wait(10, SC_NS); req = 0; } | // Untimed read transactor 4/P handshake char b_getbyte() { while(!req) do wait(10, SC_NS); char r = data; ack = 1; while(req) do wait(10, SC_NS); ack = 0; return r; } |
Example, untimed, blocking transactor: converts from transaction to pin-level modelling.
See working SystemC versions in the `Toy ESL' practical material.