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Achronix Speedster22i User Macro Guide Manual do Utilizador Página 140

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Memories BRAM80KFIFO
Speedster22i Macro Cell Library
AchronixSemiconductorProprietary PAGE 123
Table 6-19: FIFO read_width versus Maximum Read Depth
read_width
FIFO Read
De
pth
fwft = 1’b0
FIFO Read
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 6-20: dout bit assignments per read_width values
read_width doutpx[3:0] doutp[3:0] dout[31:0]
user_dout[39:36] user_dout[35:32] user_dout[31:0]
4’hx user_dout[35:32] user_dout[31:0]
4’hx 4’hx user_dout[31:0]
2’bxx,user_dout[19:18] 2’bxx,user_dout[17:16] 16’hxxxx,user_dout[15:0]
4’hx user_dout[17:16] 16’hxxxx,user_dout[15:0]
4’hx 4’hx 16’hxxxx,user_dout[15:0]
3’bxxx,user_dout[9] 3’bxxx,user_dout[8] 24’hxxxxxx,user_dout[7:0]
4’hx 3’bxxx,user_dout[8] 24’hxxxxxx,user_dout[7:0]
4’hx 4’hx 24’hxxxxxx,user_dout[7:0]
4’hx 3’bxxx,user_dout[4] 28’hxxxxxxx,user_dout[3:0]
4’hx 4’hx 28’hxxxxxxx,user_dout[3:0]
4’hx 4’hx 30’hxxxxxxxx,user_dout[1:0]
4’hx 4’hx 31’hxxxxxxxx,user_dout[0]
Required Relationship of write_width to read_width parameter assignments
TheBRAM80KFIFO blocksupportsmemorywidthsfromonetofortybitswide.Thewidthof
thedindata inputisdetermined bythe write_widthparameterwhile thewidthof thedout
dataoutputisdeterminedbytheread_widthparameter.Thewidthofreadportmaybesetto
bedifferentfromthewi
dthofthewriteport.Thereare,however,somelimitationsofthe port
width assignments between the read and write width assignments. The valid port widths
definedinTable6‐16
: BRAM80KFIFOParametersmaybedividedintothreegroups:
•Group1(nx5wi
dths):40,20,10,5
•Group2(nx9wi
dths):36,18,9
•Group3(2
n
widths):32,16,8,4,2,1
40
36
32
20
18
16
10
9
8
5
4
2
1
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