jmelson1's articles:

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production life of Spartan3A ? 12 46 (10/19/2012 10:21:30 PM) comp.arch.fpga Hello, Anybody have any idea how much longer the Spartan 3A will be in production? I'm hoping a good while, yet, as it appears to be the cheapest modest-size FPGA from Xilinx right now, about $8 for the ... Jon

XC9500XL keeper ? 6 63 (7/6/2012 11:04:47 PM) comp.arch.fpga I just migrated a project from the XCV9500 to the XC9500XL, and am having some problems with keepers on the used inputs. Looking at Xilinx' docs on the 9500XL series, it looks like the keeper may be left on ... Jon

strange letter from Xilinx 4 58 (4/10/2012 7:05:58 PM) comp.arch.fpga In 2001 I bought a seat of Xilinx Foundation (before Ise). I did not renew the service contract because it was working fine, and then Ise and WebPack came out. I had to go to the post office to sign for a cert... Jon

Spartan 3A counter speed ? 10 60 (3/23/2012 7:13:25 PM) comp.arch.fpga Hello, Does anybody have a very rough estimate of how fast you can run a 32-bit counter in a Spartan 3AN FPGA? Thanks, Jon ... Jon

jmelson1's replies:

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New(?) fast binary counter for FPGAs without carry logic (e.g. Actel) -- Request For Comment 25 53 (9/11/2012 6:47:01 PM) comp.arch.fpga Dear colleagues, I am sending you a proposal of binary counter, designed to minimize logic path length in between flip-flops to one gate (MUX) only, at the expense of not so straightforward binary counting... hefaistos (8)

production life of Spartan3A ? 12 46 (10/19/2012 10:21:30 PM) comp.arch.fpga Hello, Anybody have any idea how much longer the Spartan 3A will be in production? I'm hoping a good while, yet, as it appears to be the cheapest modest-size FPGA from Xilinx right now, about $8 for the ... jmelson1 (65)

802.15.4 RF issues 26 43 (10/27/2012 5:22:23 PM) comp.arch.embedded We are using the Microchip MRF24JA40 802.15.4 RF transceiver, might look into Atmel's AT86RF231 and Freescale's MC13202 as well. We have one working board talking to a Microchip pre-made module, but two non... me5463 (1320)

Spartan 3A startup 4 39 (11/20/2012 6:35:07 PM) comp.arch.fpga So, after being assured Spartan 3A should be around for a while (Thanks, all who commented) I made a board for a Spartan XC3S50A in the 144 lead package. I am using an SST25VF010A serial SPI PROM for config... elson (37)

Set-up and hold times and metastability 24 41 (11/22/2012 7:35:31 AM) comp.arch.fpga Hi, I've been looking at synchronising data across clock domains, and have managed to confuse myself. Can someone confirm (or correct me) that the following is true. Metastability may occur if the input... James823

MII SFD Detection with Shematics 8 25 (12/13/2012 1:57:50 AM) comp.arch.fpga Hello, I have to detect the Start of a Ethernet Frame. So I want to make use of a = FPGA. The FPGA will be connected to the MII pins of the PHY (TXD 0-3 and RX= D 0-3, the Clocks, TX_EN and RX_DV). What I kn... bln5320 (5)

Combination loops and false paths 18 30 (1/15/2013 5:54:53 AM) comp.arch.fpga I creating an FPGA implementation of a old DEC PDP-10 (KS-10, specifically) Mainframe Computer. Why? Because I always wanted one... The KS-10 was microcoded and used 10x am2901 4-bit slices in the ALU. ... radioengr (23)

EPROM programmer erase 2 23 (3/3/2013 7:39:40 PM) comp.arch.fpga (Sorry, this is a bit off topic, but I do use this to load bitfiles into FPGAs.) I have a Xeltek Superpro/Z eprom programmer, with their winsp ver. 1.0 software, running on Win 2K/Pro. Today I had need to... elson (37)

MISC - Stack Based vs. Register Based 61 12 (3/29/2013 9:00:50 PM) comp.arch.fpga I have been working with stack based MISC designs in FPGAs for some years. All along I have been comparing my work to the work of others. These others were the conventional RISC type processors supplied by... gnuarm (2644)

Admitting Your Mistakes And Learning From Them 33 18 (4/4/2013 9:57:21 PM) comp.cad.solidworks I finally figured out why I could sharpen my old stainless knife and why it would dull so quickly after I had sharpened it. It took purchasing a new knife and having the same thing happen to it. I won't be r... jonbanquer1 (486)