Achronix Speedster22i User Macro Guide Manuale Utente Scaricare il pdf (Pagina 139)

Memories BRAM80KFIFO

Speedster22i Macro Cell Library

AchronixSemiconductorProprietary PAGE 122

Table 6-17: FIFO write_width versus Maximum Write Depth

write_width

FIFO Write

pth

fwft = 1’b0

FIFO Write

Depth

fwft = 1’b1

40 2048 2049

36 2048 2049

32 2048 2049

20 4096 4097

18 4096 4097

16 4096 4097

10 8192 8193

9 8192 8193

8 8192 8193

5 16384 16385

4 16384 16385

2 32768 32769

1 65536 65537

Table 6-18: din, dinp, dinpx bit assignments p

er write_width values

write_width dinpx[3:0] dinp[3:0] din[31:0]

user_din[39:36] user_din[35:32] user_din[31:0]

4’hx user_din[35:32] user_din[31:0]

4’hx 4’hx user_din[31:0]

2’bxx,user_din[19:18] 2’bxx,user_din[17:16] 16’hxxxx,user_

din[15:0]

4’hx user_din[17:16] 16’hxxxx,user_

din[15:0]

4’hx 4’hx 16’hxxxx,user_

din[15:0]

3’bxxx,user_din[9] 3’bxxx,user_din[8] 24’hxxxxxx,user_din[7:0]

4’hx 3’bxxx,user_din[8] 24’hxxxxxx,user_din[7:0]

4’hx 4’hx 24’hxxxxxx,user_din[7:0]

4’hx 3’bxxx,user_din[4] 28’hxxxxxxx,user_din[3:0]

4’hx 4’hx 28’hxxxxxxx,user_din[3:0]

4’hx 4’hx 30’hxxxxxxxx,user_din[1:0]

4’hx 4’hx 31’hxxxxxxxx,user_din[0]

read_width

Theread_widthparameterdefinesthewidthofthe dataoutputbusoftheFIFOfromoneto

fortybits.Theallowedvalueoftheread_widthissubjecttothecombinationsdefinedbelow

in Table 6‐19: FIFO re

ad_width versus Maximum Read Depth.Table 6‐17: FIFO

write_widthversu

s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 read_width

parameteris40’h0.

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