**** BEGIN LOGGING AT Mon Oct 23 02:59:57 2006
Oct 23 14:18:47 <vmaster> hey prpplague
Oct 23 14:21:16 <prpplague> vmaster: hey hey
Oct 23 14:21:40 <prpplague> whats cookin?
Oct 23 14:23:33 <vmaster> prpplague: you had a problem with the FT2232 not returning data on a read, and told me that you've had that problem before
Oct 23 14:23:43 <vmaster> prpplague: have you been able to solve this?
Oct 23 14:24:10 <prpplague> vmaster: yes, it was based on two issues
Oct 23 14:24:33 <prpplague> vmaster: first the max current setting for the ft2232 device in eprom was set at 90mA
Oct 23 14:25:04 <prpplague> vmaster: with the buffers and leds we were pulling around 150mA
Oct 23 14:25:18 <prpplague> vmaster: this basically cause the usb device to shutdown due to over current
Oct 23 14:25:36 <prpplague> vmaster: after changing the value to 200mA it worked
Oct 23 14:25:51 <vmaster> prpplague: oh, it really uses this setting for anything other than USB enumeration?
Oct 23 14:26:05 <vmaster> prpplague: thanks, never knew that
Oct 23 14:26:22 <prpplague> vmaster: yea the host controller and the ft2232 seem to work together on that
Oct 23 14:27:25 <prpplague> vmaster: the device would initialize but the first time i tried to turn on a led or enable the buffers, the device would cut off
Oct 23 14:28:33 <vmaster> prpplague: ok, and what was the other issue?
Oct 23 14:29:58 <prpplague> vmaster: well, sorta related, the leds i was using were pulling way too much current for the ft2232
Oct 23 14:30:07 <prpplague> vmaster: we replaced them with smaller leds
Oct 23 14:30:16 <prpplague> vmaster: basically all current related
Oct 23 14:31:12 <vmaster> prpplague: okay, thanks a lot. I've just checked the Amontec JTAGkey (I have two problem reports with it), and it specifies 100mA - could be they're running into a similar issue
Oct 23 14:31:37 <prpplague> vmaster: yea, our device is very similiar to theirs
Oct 23 14:32:06 <prpplague> vmaster: i'd try adjusting the current rating to around 250mA as a test
Oct 23 14:32:27 <prpplague> vmaster: are you turning on any leds ?
Oct 23 14:35:49 <vmaster> prpplague: the JTAGkey has one LED to indicate a USB connection, one to indicate targt power-on, and one to indicate an active-low nSRST, so at least two leds are always powered
Oct 23 14:38:04 <prpplague> vmaster: yea, i'd guess that it might be that
Oct 23 14:38:53 <prpplague> vmaster: average led current is about 20mA 
Oct 23 14:39:04 <prpplague> vmaster: so you are already down to just 60mA available to you
Oct 23 14:45:18 <vmaster> prpplague: yeah, the FT2232L uses 30mA itself, leaving only 30mA for the buffers
**** ENDING LOGGING AT Tue Oct 24 02:59:57 2006