Heading3 - sr_assertion, Heading3 - verilog instantiation template, Table – Achronix Speedster22i User Macro Guide User Manual
Page 89
Registers
DFFNES
Speedster22i Macro Cell Library
PAGE 73
sr_assertion
The sr_assertion parameter defines the behavior of the output when the sn set input is
asserted. Assigning the sr_assertion to “unclocked” results in an asychronous assertion of the
set signal, where the q output is set to one upon assertion of the active‐low set signal.
Assigning the sr_assertion to “clocked” results in a synchronous assertion of the set signal,
where the q output is set to one at the next falling edge of the clock. The default value of the
sr_assertion parameter is “unclocked”.
Table 2-36: DFFNES Function Table when sr_assertion = “unclocked”
Inputs
Output
sn
ce
d
ckn
q
Table 2-37: DFFNES Function Table when sr_assertion = “clocked”
Inputs
Output
sn
ce
d
ckn
q
Verilog Instantiation Template
DFFNES #(.init(1’b1),
.sr_assertion(“unclocked”))
instance_name
(.q(user_out),
.d(user_din),
.sn(user_set),
.ce(user_clock_enable),
.ckn(user_clock));
0
X
X
X
1
1
0
X
X
Hold
1
1
0
0
1
1
1
1
0
X
X
1
1
0
X
X
Hold
1
1
0
0
1
1
1
1