I just finished a PCB design with the Cypress FX2LP (CY7C68013A-100AC). When I plug the device into a linux box, I get "device not accepting address" errors.
Since this is such a simple interface: Power up FX2 and connect D+/D-/GND to host controller, I suspect that the problem might be with my D- and D+ traces, but would like other people's input. Please see below for dmesg and usbmon output. I have a few questions: 1) I tried decoding the setup packets but it is not a 'standard device request' but a 'class request', shouldn't it be the former or am I missing something? 2) Is the fx2lp actually working? I suspect it is because according to usbmon, the fx2lp responded to the first setup packet with: e89de2c0 1532923663 C Ci:001:00 0 4 = 01050100 3) If the fx2lp is actually responding to usb requests, why is it not accepting the address the host is trying to assign to it? I have a slew of other fx2lp devices which all work, this is the first one that is on a custom PCB. When examining D-/D+ on a scope, things look fine. Any insight will be greatly appreciated. ---------- dmesg ------------- Jun 13 13:29:15 toga2 kernel: usb 1-1: device not accepting address 15, error -71 Jun 13 13:29:15 toga2 kernel: usb 1-1: new full speed USB device using uhci_hcd and address 16 Jun 13 13:29:15 toga2 kernel: usb 1-1: uhci_result_common: failed with status 440000 Jun 13 13:29:15 toga2 kernel: usb 1-1: uhci_result_common: failed with status 440000 Jun 13 13:29:15 toga2 kernel: usb 1-1: device not accepting address 16, error -71 Jun 13 13:29:15 toga2 kernel: hub 1-0:1.0: state 7 ports 2 chg 0000 evt 0002 ------------------------------ ---------- dmesg (high verbosity) ------------- Jun 16 09:49:18 toga2 kernel: usb 1-1: uhci_result_common: failed with status 440000 Jun 16 09:49:18 toga2 kernel: [f78f46c0] CTL QH link (378f4422) element (37dd5240) Jun 16 09:49:18 toga2 kernel: urb_priv [e37b4330] urb [f77ce1c0] qh [f78f46c0] Dev=0 EP=0(IN) CTL Actlen=0 Jun 16 09:49:18 toga2 kernel: 1: [f7dd5240] link (37dd51b0) e0 Stalled CRC/Timeo Length=7 MaxLen=7 DT0 EndPt=0 Dev=0, PID=2d(SETUP) (buf=35e87d80) Jun 16 09:49:18 toga2 kernel: 2: [f7dd51b0] link (37dd51e0) e3 SPD Active Length=0 MaxLen=3f DT1 EndPt=0 Dev=0, PID=69(IN) (buf=37a53e80) Jun 16 09:49:18 toga2 kernel: 3: [f7dd51e0] link (37dd5270) e3 IOC Active Length=0 MaxLen=7ff DT1 EndPt=0 Dev=0, PID=e1(OUT) (buf=00000000) Jun 16 09:49:18 toga2 kernel: Dummy TD Jun 16 09:49:18 toga2 kernel: [f7dd5270] link (37dd51b0) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=0, PID=e1(OUT) (buf=00000000) ------------------------------ --------- usbmon ------------- f7dd8840 1483781836 C Ii:001:01 0 2 = 0200 f7dd8840 1483781854 S Ii:001:01 -115 2 < e89deac0 1483781878 S Ci:001:00 s a3 00 0000 0001 0004 4 < e89deac0 1483781892 C Ci:001:00 0 4 = 01050100 e89deac0 1483781897 S Co:001:00 s 23 01 0010 0001 0000 0 e89deac0 1483781902 C Co:001:00 0 0 e89deac0 1483781909 S Ci:001:00 s a3 00 0000 0001 0004 4 < e89deac0 1483781913 C Ci:001:00 0 4 = 01050000 e89deac0 1483813891 S Ci:001:00 s a3 00 0000 0001 0004 4 < e89deac0 1483813900 C Ci:001:00 0 4 = 01050000 e89deac0 1483845835 S Ci:001:00 s a3 00 0000 0001 0004 4 < e89deac0 1483845843 C Ci:001:00 0 4 = 01050000 e89deac0 1483877834 S Ci:001:00 s a3 00 0000 0001 0004 4 < e89deac0 1483877841 C Ci:001:00 0 4 = 01050000 e89deac0 1483909898 S Ci:001:00 s a3 00 0000 0001 0004 4 < e89deac0 1483909906 C Ci:001:00 0 4 = 01050000 e89deac0 1483909927 S Co:001:00 s 23 03 0004 0001 0000 0 e89deac0 1483909933 C Co:001:00 0 0 e89deac0 1483965835 S Ci:001:00 s a3 00 0000 0001 0004 4 < e89deac0 1483966025 C Ci:001:00 0 4 = 00001000 e89deac0 1483966030 S Co:001:00 s 23 01 0014 0001 0000 0 e89deac0 1483966034 C Co:001:00 0 0 e89deac0 1483966038 S Co:001:00 s 23 01 0001 0001 0000 0 e89deac0 1483966042 C Co:001:00 0 0 e89deac0 1483966050 S Co:001:00 s 23 01 0001 0001 0000 0 e89deac0 1483966053 C Co:001:00 0 0 ------------------------- And as an example of what usbmon displays for another fx2 device that works properly: --------- usbmon (development FX2, device works properly) ------------- f7dd8840 1532923596 C Ii:001:01 0 2 = 0200 f7dd8840 1532923618 S Ii:001:01 -115 2 < e89de2c0 1532923647 S Ci:001:00 s a3 00 0000 0001 0004 4 < e89de2c0 1532923663 C Ci:001:00 0 4 = 01050100 e89de2c0 1532923667 S Co:001:00 s 23 01 0010 0001 0000 0 e89de2c0 1532923674 C Co:001:00 0 0 e89de2c0 1532923682 S Ci:001:00 s a3 00 0000 0001 0004 4 < e89de2c0 1532923685 C Ci:001:00 0 4 = 01050000 e89de2c0 1532955586 S Ci:001:00 s a3 00 0000 0001 0004 4 < e89de2c0 1532955595 C Ci:001:00 0 4 = 01050000 e89de2c0 1532987566 S Ci:001:00 s a3 00 0000 0001 0004 4 < e89de2c0 1532987575 C Ci:001:00 0 4 = 01050000 e89de2c0 1533019585 S Ci:001:00 s a3 00 0000 0001 0004 4 < e89de2c0 1533019593 C Ci:001:00 0 4 = 01050000 e89de2c0 1533051583 S Ci:001:00 s a3 00 0000 0001 0004 4 < e89de2c0 1533051591 C Ci:001:00 0 4 = 01050000 e89de2c0 1533051613 S Co:001:00 s 23 03 0004 0001 0000 0 e89de2c0 1533051619 C Co:001:00 0 0 e89de2c0 1533107573 S Ci:001:00 s a3 00 0000 0001 0004 4 < e89de2c0 1533107803 C Ci:001:00 0 4 = 03051000 e89de2c0 1533163585 S Co:001:00 s 23 01 0014 0001 0000 0 e89de2c0 1533163594 C Co:001:00 0 0 e89de2c0 1533163611 S Co:000:00 s 00 05 0030 0000 0000 0 e89de2c0 1533163690 C Co:000:00 0 0 e89de2c0 1533183595 S Ci:048:00 s 80 06 0100 0000 0008 8 < e89de2c0 1533183701 C Ci:048:00 0 8 = 12010002 ffffff40 e89de2c0 1533183712 S Ci:048:00 s 80 06 0100 0000 0012 18 < e89de2c0 1533183823 C Ci:048:00 0 18 = 12010002 ffffff40 bb0f0100 02010102 0601 e89de2c0 1533183844 S Ci:048:00 s 80 06 0200 0000 0009 9 < e89de2c0 1533183948 C Ci:048:00 0 9 = 09023200 030100c0 00 e89de2c0 1533183957 S Ci:048:00 s 80 06 0200 0000 0032 50 < e89de2c0 1533184072 C Ci:048:00 0 50 = 09023200 030100c0 00090400 0000ffff ff030904 010001ff ffff0407 05020200 e89de2c0 1533184088 S Ci:048:00 s 80 06 0300 0000 00ff 255 < e89de2c0 1533184200 C Ci:048:00 0 6 = 06030000 0904 ---- snip ----- -------------------------- -- 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