Achronix Speedster22i User Macro Guide Bedienungsanleitung PDF herunterladen (Seite 138)

Memories BRAM80KFIFO

Speedster22i Macro Cell Library

AchronixSemiconductorProprietary PAGE 121

Parameters

Table 6-16: BRAM80KFIFO Parameters

Parameter Defined Values Default Value

sync_mode 1’b0

write_width 40

read_width 40

fwft 1’b0

en_out_reg 1’b1

reg_initval 40’h0

reg_srval 40’h0

reg_rstval 1’b1

regce_priority “rstreg”

wrrst_rstval 1’b1

wrrst_input_mode 2’b10

wrrst_sync_stages 2’b00

wrptr_sync_stages 2’b00

rdrst_rstval 1’b1

rdrst_input_mode 2’b10

rdrst_sync_stages 2’b00

rdptr_sync_stages 2’b00

wrcount_sync_mode 1’b1

rdcount_sync_mode 1’b1

afull_offset 17’h00004

aempty_offset 17’h00004

wren_polarity_sel 1’b1

rden_polarity_sel 1’b1

en_rd_when_empty 1’b0

en_wr_when_full 1’b0

sync_mode

The sync_mode parameter is used to bypass the synchronization circutry between the read 

andwriteportswhenbothportsareconnectedtothesameclock.Ifboththewrclkandrdclk

clockinputsareconnectedtothesameclockwithoutanyphasedifferencebetweentherdclk

andwrclkinputs,theusermaysetthesync_m

odeparameterto1’b1toallowfasterupdatesto

thestatusflags(empty,full,etc.).Ifthereadandwriteclocksareconnectedtodifferentclocks,

thesynchronizationcircutrymustbeusedandthesync_modeparametermustbesetto1’b0.

Thedefaultvalueofthesync_modeparameteris1’

b0.

write_width

Thewrite_widthparameterdefinesthe widthof thedatainputbusoftheFIFO fromone to

fortybitsaccordingtotheallowedvaluesdefinedinTable6‐16

: BRAM80KFIFOParameters.

Table6‐17

: FIFOwrite_widthversusMaximumWriteDepthdefinesthemaximumdepthof

theFIFO foreachoftheva

lid valuesof thewrite_widthparameter. Thedefault value ofthe 

write_widthparameteris40’h0.

1’b0, 1’b1

1, 2, 4, 5, 8, 9, 10, 16, 18, 20, 32, 36, 40

1’b0, 1’b1

40-bit hexadecimal number

1’b0, 1’b1

“rstreg”, “regce”

1’b0, 1’b1

2’b00, 2’b01, 2’b10, 2’b11

1’b0, 1’b1

2’b00, 2’b01, 2’b10, 2’b11

1’b0, 1’b1

17-bit hexadecimal number

1’b0, 1’b1

1 2 ... 133 134 135 136 137 138 139 140 141 142 143 ... 223 224

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