Achronix Speedster22i User Macro Guide Manuale Utente Scaricare il pdf (Pagina 177)

Memories LRAMFIFO

Speedster22i Macro Cell Library

AchronixSemiconductorProprietary PAGE 160

LRAMFIFO

LRAM-Based 64-Word FIFO Memory

LRAMFIFO

dout[width - 1:0]

full

read_err

din[width - 1:0]

rstn

wren

rden

empty

almost_empty

almost_full

write_err

wrclk

rdclk

Figure 6-31: Logic Symbol

TheLRAMFIFOimplementsa64wo

rdbyn‐bitFIFOmemoryblockutilizingtheembedded

LRAMblocksandLUTs.TheLRAMFIFOcanbeconfiguredtosupportavarietyofwidthsin

incrementsofone bit.Thereadandwriteclocksmaybeeithersynchronousorasynchronous

withrespecttoeachother.Iftheuse

rreadandwriteclocksarethesameclock,theusermay

setthesync_modeto1’b1toenablefasterandsynchronousgenerationofthestatusflags.

Figure 6-32: LR

AMFIFO Block Diagram

LRAM

Output

dout

Memory

Write

Pointer

Logic

Read

Pointer

Logic

Memory Control /

Flag Generation

Logic

din

wren

wrclk

rstn

rdclk

full

empty

almost_full

almost_empty

write_err

read_err

rden

1 2 ... 172 173 174 175 176 177 178 179 180 181 182 ... 223 224

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