.PS
# `SRffMan.m4'
log_init
# Here is how to include an arbitrary circuit
# (an SR-flipflop, for example)
# that is not one of the standard gates.
# First, define the circuit with a name ending
# in _gate. Put its inputs named In1, In2, ...
# on the left and the output Out on the right.
define(`SR_gate',`[ u = 2*L_unit
S: NOR_gate
line right_ 2*u from S.Out
Out: Here
R: NOR_gate at S+(0,-5*u)
TS: S.In2-(u,0)
TR: (TS,R.In1)
dot(at S.Out+(u,0))
line down u*3/2 then to TR+(0,u) then to TR then to R.In1
line from R.Out right u then up u*3/2 then to TS+(0,-u) \
then to TS then to S.In2
In1: S.In1
In2: R.In2 ]')
# Now define the function by which the circuit
# will be invoked using the built-in _AutoGate:
define(`SRff',`_AutoGate(SR,$@)')
# You are done. Here is an example:
G: [
F: Autologix(SRff(And(x,y),Nand(x,y)),LRV)
"$x$" at F.Inx rjust
"$y$" at F.Iny rjust
"\sl Out" at F.Out ljust
]
`"{\tt Autologix(SRff(And(x,y),Nand(x,y)),LRV)}"' wid 253pt__ ht 7pt__ \
with .w at last [].sw+(0,-10pt__)
.PE