1)Hardware enviroment
Our board use CY7C68013A as synchronouse slave fifo, and a fpga as master.
CY7C68013A's CLKOUT at 12MHz, and FPGA's PLL use as input, output 40Mhz as CY7C68013A's IFCLK.
EEPROM is blank.
2)firmware and modification
use Cypress Suite USB 3.4.7\Firmware\Bulkloop example, and only modify BulkLoop.c as follow:
// CPUCS = ((CPUCS & ~bmCLKSPD) | bmCLKSPD1) ;
// CPUCS = (CPUCS & ~bmCLKSPD) |bmCLKSPD0; //24MHz
CPUCS = CPUCS & ~bmCLKSPD ; //12MHz CLKOUT
// set the slave FIFO interface to 48MHz
//IFCONFIG |= 0x40;
IFCONFIG = 0x03; //slave fifo, sync, external
3)host pc
windows 7 32bit.
Cypress Suite USB 3.4.7
CY3684_EZ-USB_FX2LP_DVK
4)Running result
When board first plug in, enumerate ok. We can find Cypress EZ-USB FX2LP No EEPROM(3.4.5.000).
Use Cyconsole download BulkLoop.hex to CY7C68013A, re enumerate fail.
We can only find a "Unknown Device" in windows device manager. In the device property, can't find anything
about VID and PID.
We run bus hound, can capture the first enumerate, but no packet about the second enumerate.
Any tip will be wellcome.
Thanks a lot!
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