Altera Integer Arithmetic IP Bedienungsanleitung PDF herunterladen (Seite 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 1s, 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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