/*
* Revision Control Information
*
* $Source: /vol/opua/opua2/sis/sis-
1.2/common/src/sis/latch/RCS/latch.doc,v $
* $Author: sis $
* $Revision: 1.3 $
* $Date: 1992/10/20 17:50:01 $
*
*/ latch_t * latch_alloc()
Allocate and return a new latch structure. void latch_free(l) latch_t *l;
Free the latch structure for latch l. void latch_set_input(l, n) latch_t *l; node_t *n;
Set the input node of the latch l to node n. node_t * latch_get_input(l) latch_t *l;
Return a pointer to the input node of the latch l. void latch_set_output(l, n) latch_t *l; node_t *n;
Set the output node of the latch l to node n. node_t * latch_get_output(l) latch_t *l;
Return a pointer to the output node of the latch l. void latch_set_initial_value(l, v) latch_t *l; int v;
Takes a latch structure and sets the initial state value to v. int latch_get_initial_value(l) latch_t *l;
Returns the value in the latch structure corresponding to the initial state.

void latch_set_current_value(l, v) latch_t *l; int v;
Takes a latch structure and sets the current state value to v. int latch_get_current_value(l) latch_t *l;
Returns the value in the latch structure corresponding to the current state. void latch_set_type(l, t) latch_t *l; latch_synch_t t;
Set the type of the latch l to t. The type is one of ACTIVE_HIGH,
ACTIVE_LOW, RISING_EDGE, FALLING_EDGE, and UNKNOWN. latch_synch_t latch_get_type(l) latch_t *l;
Return the type of the latch l. void latch_set_gate(l, g) latch_t *l; lib_gate_t *gate;
Set the library gate that the latch l points to in a mapped network to gate g. lib_gate_t * latch_get_gate(l) latch_t *l; void
Return the gate that the latch l points to. latch_set_control(l, g) latch_t *l; node_t *g;
Set the gate that controls the latch l to gate g. node_t * latch_get_control(l) latch_t *l;
Return the node that serves as the control for latch l. latch_t * latch_from_node(node) node_t *node;
Returns the latch associated with the node, if it exists.
Otherwise,

it returns NIL. It is a serious error if `node' is not part of
a network. int latch_equal(l1, l2) latch_t *l1, *l2;
Returns a 1 if all the fields of the two latches are identical, and a 0 otherwise. This is used to merge two identical latches that have the same data fanin signal.