Achronix Speedster22i User Macro Guide Manuale Utente Scaricare il pdf (Pagina 178)

Memories LRAMFIFO

Speedster22i Macro Cell Library

AchronixSemiconductorProprietary PAGE 161

Table 6-50: LRAMFIFO Pin Description

Name Type

Clock

Domain

Description

din[width-1:0] Write port data input.

wren

Write enable (a

ctive-high). Data is written into the FIFO at

the next rising edge of the write clock when wren is driven

high, as long as the full flag is not asserted.

wrclk Write clock. (r

ising edge based).

rstn

FIFO reset (a

ctive-low). Asserting the rstn signal low resets

the FIFO to clear both the read and the write pointers and

set the FIFO to the empty condition.

rden

Read enable (ac

tive-high). Data is read from the FIFO at

the next active edge of the clock when the rden is driven

high, as long as the empty flag is not asserted.

rdclk Read clock (rising edge

based).

dout[width-1:0] Read port dout output.

empty Empty flag (ac

tive-high).

full Full flag (a

ctive-high).

almost_empty Almost Empty flag (

active-high).

almost_full Almost Full flag (

active-high).

write_err Write Error flag (ac

tive-high).

read_err Read Error flag (ac

tive-high).

Parameters

Table 6-51: LRAMFIFO Parameters

Parameter Defined Values Default Value

width 10

depth 10

ptr_sync_mode 1’b0

wrptr_sync_stages 2’b00

rdptr_sync_stages 2’b00

rst_sync_mode 1’b0

wrrst_sync_stages 2’b00

rdrst_sync_stages 2’b00

afull_offset 7’h04

aempty_offset 7’h04

width

ThewidthparameterdefinesthewidthofthedatainputandoutputbussesoftheFIFO.The

widthparametermustbea multiple oftenbits.Thedefaultvalue ofthe widthparameteris

10’h0.

depth

The depth parameter defines the depth of the FIFO, which may be up to 64 locations.

Choosing a depth of less than the full depth of 64 locations will allow a smaller imple‐

mentationoftheFIFOcontr

ollerlogic.Thedefaultvalueofthedepthparameteris64.

input wrclk

input async.

input rdclk

output rdclk

output wrclk

output rdclk

output wrclk

output rdclk

positive integers

8-64

1’b0, 1’b1

2’b00, 2’b01, 2’b10, 2’b11

1’b0, 1’b1

2’b00, 2’b01, 2’b10, 2’b11

7-bit hexadecimal number

1 2 ... 173 174 175 176 177 178 179 180 181 182 183 ... 223 224

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