Altera SCFIFO Manual de usuario descargar pdf (Pagina 7)

Parameter Type Requir

Description

lpm_numwords Integer Yes Specifies the depths of the FIFO you require. The value

must be at least 4.

The value assigned must comply with this equation,

2LPM_WIDTHU

lpm_showahead String Yes Specifies whether the FIFO is in normal mode (OFF) or

show-ahead mode (ON).

For normal mode, the FIFO IP core treats the rdreq

port as a normal read request that only performs read

operation when the port is asserted.

For show-ahead mode, the FIFO IP core treats the

rdreq port as a read-acknowledge that automatically

outputs the first word of valid data in the FIFO IP core

(when the empty or rdempty port is low) without

asserting the rdreq signal. Asserting the rdreq signal

causes the FIFO IP core to output the next data word, if

available.

If you set the parameter to ON, you may reduce

performance.

lpm_type

String No Identifies the library of parameterized modules (LPM)

entity name. The values are SCFIFO and DCFIFO.

maximize_speed Integer No Specifies whether or not to optimize for area or speed.

The values are 0 through 10. The values 0, 1, 2, 3, 4,

and 5 result in area optimization, while the values 6, 7,

8, 9, and 10 result in speed optimization.

This parameter is applicable for Cyclone II and

Stratix II devices only.

overflow_checking String No Specifies whether or not to enable the protection

circuitry for overflow checking that disables the wrreq

port when the FIFO IP core is full. The values are ON

or OFF. If omitted, the default is ON.

underflow_checking String No Specifies whether or not to enable the protection

circuitry for underflow checking that disables the rdreq

port when the FIFO IP core is empty. The values are

ON or OFF. If omitted, the default is ON.

Note that reading from an empty SCFIFO gives

unpredictable results.

(5)

Only applicable for the DCFIFO IP core.

UG-MFNALT_FIFO

2014.12.17

SCFIFO and DCFIFO Parameters

SCFIFO and DCFIFO IP Cores User Guide

Altera Corporation

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