|
Message
From: John Sheahan <jrsheahan@o...>
Date: 27 Nov 2003 20:03:25 +1100
Subject: Re: [oc] OT : FPGA price
On Thu, 2003-11-27 at 19:28, Martin.J Thompson wrote:
> According to the answers database, "There is no power sequencing requirement for Virtex-II/ Virtex-II Pro", Record Number: 10989 Last Modified: 08/21/03... do you have more recent information from them?
>
Hi Martin
newer? dunno - but see page 5 DC/switching section. Page 62 into the pdf.
This is much as I remember from last year.
according to the data sheet
DS083-3 (v2.12) November 11, 2003
Xilinx FPGAs require a certain amount of supply current
during power-on to insure proper device initialization. The
actual current consumed depends on the power-on ramp
rate of the power supply.
The VCCINT power supply must ramp on no faster than
200uS and no slower than 50 ms. Ramp-on is defined as:
0 VDC to minimum supply voltages (see Table 2).
VCCAUX and VCCO can power on at any ramp rate. Power
supplies can be turned on in any sequence, though VCCAUX
must power on before or with VCCO for the specifications
shown in Table 5 to apply.
Symbol Units
XC2VP2 XC2VP4 XC2VP7 XC2VP20 XC2VP30 XC2VP40 XC2VP50 XC2VP70 XC2VP100 XC2VP125
ICCINTMIN 500 500 500 600 800 1050 1250 1700 TBD TBD mA
250 250 250 250 250 250 250 250 250 250 mA
ICCAUXMIN
ICCOMIN 100 100 100 100 100 100 100 100 100 100 mA
call me a cynic - but if the manufacturer says in one place that no limits apply
and in another spot that conditions apply - I'll consider meeting the
preconditions if reasonably practical..
I'm not always convinced their best engineers staff the answer service.
(not wanting to pick on Xilinx here - at least they make a real attempt
to spec things. They make good fpgas. Specs are HARD to do well).
john
|
 |
Browse
