Altera Integer Arithmetic IP - Manual (Page 22)

Port Name Required Description
cnt_en
No Count enable input to disable the count when asserted low
without affecting
sload
,
sset
, or
sclr
. If omitted, the default
value is
1
.
updown
No Controls the direction of the count. When asserted high (
1
), the
count direction is up, and when asserted low (
0
), the count
direction is down. If the
LPM_DIRECTION
parameter is used, the
updown
port cannot be connected. If
LPM_DIRECTION
is not used,
the
updown
port is optional. If omitted, the default value is up (
1
).
cin
No Carry-in to the low-order bit. For up counters, the behavior of the
cin
input is identical to the behavior of the
cnt_en
input. If
omitted, the default value is
1
(VCC).
aclr
No Asynchronous clear input. If both
aset
and
aclr
are used and
asserted,
aclr
overrides
aset
. If omitted, the default value is
0
(disabled).
aset
No Asynchronous set input. Specifies the
q[]
outputs as all
1
s, or to
the value specified by the
LPM_AVALUE
parameter. If both the
aset
and
aclr
ports are used and asserted, the value of the
aclr
port
overrides the value of the
aset
port. If omitted, the default value is
0, disabled.
aload
No Asynchronous load input that asynchronously loads the counter
with the value on the data input. When the
aload
port is used, the
data[]
port must be connected. If omitted, the default value is
0
,
disabled.
sclr
No Synchronous clear input that clears the counter on the next active
clock edge. If both the
sset
and
sclr
ports are used and asserted,
the value of the
sclr
port overrides the value of the
sset
port. If
omitted, the default value is
0
, disabled.
sset
No Synchronous set input that sets the counter on the next active
clock edge. Specifies the value of the q outputs as all 1s, or to the
value specified by the
LPM_SVALUE
parameter. If both the
sset
and
sclr
ports are used and asserted, the value of the
sclr
port
overrides the value of the
sset
port. If omitted, the default value is
0 (disabled).
sload
No Synchronous load input that loads the counter with
data[]
on the
next active clock edge. When the
sload
port is used, the
data[]
port must be connected. If omitted, the default value is
0
(disabled).
Table 2-3: LPM_COUNTER Megafunction Output Ports
Port Name Required Description
q[]
No Data output from the counter. The size of the output port
depends on the
LPM_WIDTH
parameter value. Either
q[]
or at least
one of the
eq[15..0]
ports must be connected.
2-4 Ports
UG-01063
2014.12.19
Altera Corporation LPM_COUNTER (Counter)
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