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FPGA speed grade by Unknown on Sep 9, 2004			Not available!
Hi All, What does speed grade in FPGA part name signifies? Say xilinx part name: XC3S50 -4 PQ G 208 C, So how this -4 term is related with the FPGA speed? Thanks, Dipak Hi All, What does speed grade in FPGA part name signifies? Say xilinx part name: XC3S50 -4 PQ G 208 C, So how this -4 term is related with the FPGA speed? Thanks, Dipak

FPGA speed grade by Unknown on Sep 9, 2004			Not available!
On Thu, 2004-09-09 at 13:45, Dipak Modi wrote: [q] Hi All, What does speed grade in FPGA part name signifies? Say xilinx part name: XC3S50 -4 PQ G 208 C, So how this -4 term is related with the FPGA speed? Thanks, Dipak[/q] It's a random number assign by FPGA Marketing people. Depending on the part family and manufacturer, either smaller OR larger number means a "faster device". After a random number has been assigned by marketing, engineering looks through the device and tries to come up with some sort of an example where that number is the result of some timing parameter. After that it is packaged in to documentation to make it look like a scientifically derived speed grade. Don't laugh, thats the truth. Regards, rudi ============================================================= Rudolf Usselmann, ASICS World Services, <A HREF="http://www.asics.ws">http://www.asics.ws</A> Your Partner for IP Cores, Design, Verification and Synthesis On Thu, 2004-09-09 at 13:45, Dipak Modi wrote: Hi All, What does speed grade in FPGA part name signifies? Say xilinx part name: XC3S50 -4 PQ G 208 C, So how this -4 term is related with the FPGA speed? Thanks, Dipak It's a random number assign by FPGA Marketing people. Depending on the part family and manufacturer, either smaller OR larger number means a "faster device". After a random number has been assigned by marketing, engineering looks through the device and tries to come up with some sort of an example where that number is the result of some timing parameter. After that it is packaged in to documentation to make it look like a scientifically derived speed grade. Don't laugh, thats the truth. Regards, rudi ============================================================= Rudolf Usselmann, ASICS World Services, http://www.asics.ws Your Partner for IP Cores, Design, Verification and Synthesis

FPGA speed grade by Unknown on Sep 9, 2004			Not available!
Hi Dipak, FPGA's come in different speed grades. So within one family, you might have four different speed grades for the same part number and package. I am not sure about Xilinx, but with Altera FPGA's the lower the -X the faster the FPGA. The speed is specified in terms of the tpd (pin-to-pin delay) parameter in the FPGA datasheet. This affects the maximum operating frequency of your design in that particular FPGA. Hope this helps, Regards Rohit ----- Original Message ----- From: "Dipak Modi" <<A HREF="http://www.opencores.org/mailman/listinfo/cores">dipakm at einfochips.com</A>> To: <<A HREF="http://www.opencores.org/mailman/listinfo/cores">ASICDESIGN at yahoogroups.com</A>>; "Discussion list about free open source IP cores" <<A HREF="http://www.opencores.org/mailman/listinfo/cores">cores at opencores.org</A>> Sent: 09 September 2004 12:15 Subject: [oc] FPGA speed grade Hi All, What does speed grade in FPGA part name signifies? Say xilinx part name: XC3S50 -4 PQ G 208 C, So how this -4 term is related with the FPGA speed? Thanks, Dipak _______________________________________________ <A HREF="http://www.opencores.org/mailman/listinfo/cores">http://www.opencores.org/mailman/listinfo/cores</A> Hi Dipak, FPGA's come in different speed grades. So within one family, you might have four different speed grades for the same part number and package. I am not sure about Xilinx, but with Altera FPGA's the lower the -X the faster the FPGA. The speed is specified in terms of the tpd (pin-to-pin delay) parameter in the FPGA datasheet. This affects the maximum operating frequency of your design in that particular FPGA. Hope this helps, Regards Rohit ----- Original Message ----- From: "Dipak Modi" dipakm at einfochips.com> To: ASICDESIGN at yahoogroups.com>; "Discussion list about free open source IP cores" cores at opencores.org> Sent: 09 September 2004 12:15 Subject: [oc] FPGA speed grade Hi All, What does speed grade in FPGA part name signifies? Say xilinx part name: XC3S50 -4 PQ G 208 C, So how this -4 term is related with the FPGA speed? Thanks, Dipak _______________________________________________ http://www.opencores.org/mailman/listinfo/cores

FPGA speed grade by mhossain on May 10, 2007			mhossain Posts: 1 Joined: Nov 3, 2018 Last seen: Nov 1, 2026
Hi Rohit, The Xiling changed the grading system from spartan and virtex family. Higher the garde faster the device. Prior to that it was like altera convension. -Moazzam ----- Original Message ----- From: Rohit Mathur<<A HREF="http://www.opencores.org/mailman/listinfo/cores">rohitmathurs at h...</A>> To: Date: Thu Sep 9 09:08:59 CEST 2004 Subject: [oc] FPGA speed grade [q] Hi Dipak, FPGA's come in different speed grades. So within one family, you might have four different speed grades for the same part number and package. I am not sure about Xilinx, but with Altera FPGA's the lower the -X the faster the FPGA. The speed is specified in terms of the tpd (pin-to-pin delay) parameter in the FPGA datasheet. This affects the maximum operating frequency of your design in that particular FPGA. Hope this helps, Regards Rohit ----- Original Message ----- From: "Dipak Modi" <<A HREF="http://www.opencores.org/mailman/listinfo/cores">dipakm at e...</A>> To: <<A HREF="http://www.opencores.org/mailman/listinfo/cores">ASICDESIGN at y...</A>>; "Discussion list about free open source IP cores" <<A HREF="http://www.opencores.org/mailman/listinfo/cores">cores at o...</A>> Sent: 09 September 2004 12:15 Subject: [oc] FPGA speed grade Hi All, What does speed grade in FPGA part name signifies? Say xilinx part name: XC3S50 -4 PQ G 208 C, So how this -4 term is related with the FPGA speed? Thanks, Dipak _______________________________________________ <A HREF="http://www.opencores.org/mailman/listinfo/cores">http://www.opencores.org/mailman/listinfo/cores</A> [/q] Hi Rohit, The Xiling changed the grading system from spartan and virtex family. Higher the garde faster the device. Prior to that it was like altera convension. -Moazzam ----- Original Message ----- From: Rohit Mathurrohitmathurs at h...> To: Date: Thu Sep 9 09:08:59 CEST 2004 Subject: [oc] FPGA speed grade Hi Dipak, FPGA's come in different speed grades. So within one family, you might have four different speed grades for the same part number and package. I am not sure about Xilinx, but with Altera FPGA's the lower the -X the faster the FPGA. The speed is specified in terms of the tpd (pin-to-pin delay) parameter in the FPGA datasheet. This affects the maximum operating frequency of your design in that particular FPGA. Hope this helps, Regards Rohit ----- Original Message ----- From: "Dipak Modi" dipakm at e...> To: ASICDESIGN at y...>; "Discussion list about free open source IP cores" cores at o...> Sent: 09 September 2004 12:15 Subject: [oc] FPGA speed grade Hi All, What does speed grade in FPGA part name signifies? Say xilinx part name: XC3S50 -4 PQ G 208 C, So how this -4 term is related with the FPGA speed? Thanks, Dipak _______________________________________________ http://www.opencores.org/mailman/listinfo/cores

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