Achronix Speedster22i User Macro Guide - Manual (Page 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 (active-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. (rising edge based).
rstn
FIFO reset (active-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 (active-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 (active-high).
full Full flag (active-high).
almost_empty Almost Empty flag (active-high).
almost_full Almost Full flag (active-high).
write_err Write Error flag (active-high).
read_err Read Error flag (active-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 controller logic. The default value of the depth parameter is 64.
input wrclk
input wrclk
input wrclk
input async.
input rdclk
input rdclk
output rdclk
output rdclk
output wrclk
output rdclk
output wrclk
output wrclk
output rdclk
positive integers
8-64
1’b0, 1’b1
2’b00, 2’b01, 2’b10, 2’b11
2’b00, 2’b01, 2’b10, 2’b11
1’b0, 1’b1
2’b00, 2’b01, 2’b10, 2’b11
2’b00, 2’b01, 2’b10, 2’b11
7-bit hexadecimal number
7-bit hexadecimal number