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CPLD choice Xilinx or @ltera
Hi Hornstein,
If your design is about 180MC. For XO series, you can try XO640 or XO256. It is base on your design resource requirement. It is much cheaper than Coolrunner. XO256 is about $2; XO640 is about $3. And its LUT can config as ram. If you need memory, Xo...
spartan or virtex
Virtex's Fmax is much higher than Spartan series.
Virtex's primary clock can reach 550Mhz; spartan3's primay clock is only 306Mhz.
And virtex has more routing resource and different LUT architecture(Virtex5 LUT6), so after logic P&R. Virtex will much faster than Spartan.
And...
CPLD choice Xilinx or @ltera
Coolrunner2 is better choice. But it is expensive.
And MaxII's static current is higher.
If you need one design less than 64MC, you can choose Coolrunner2. If your design is larger, maybe you can check lattice's XO and MACH4000Z.
ram vhdl
Hi Zilak,
FYI.
-------------Pseudo Dual Port VHDL Example
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_arith.all;
use IEEE.std_logic_unsigned.all;
entity daul_port_ram is
generic (data_width : natural := 8;
addr_width : natural := 16);
port ( clk_in...
If you want to design such design without th PROM. Maybe you can try lattice's XP device. It has the same architecture as Xilinx's FPGA, and it contains own FLASH on chip.
difference between spartan 2 and spartan 3
If you need DSP block and high speed with good price, then select Spartan3.
Elsif you need one FPGA to support 5V IO and simple Power supply, then select Spartan2.
Also you can try altera's Cyclone/2 and Lattice' XP/ECP2.
The most important thing is...
Lattice xPLD
Hi Jay,
XP and XO are the new products of Lattice. These two products use the same XP technology just like XPLD. But they are much cheaper than XPLD. They are all LUT base device. XP is focus on low cost FPGA, XO is focus on large CPLD.
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