USB Forum Discussions

Can someone please share with me the maximum throughput they've been able to achieve using the CY7C67300?  I would like to confirm that there is indeed a good solution waiting out there for me to find it.  I call this "confirming that the pot of gold is indeed a the end of the rainbow," before I go searching (R&D).

Specifically, I'm using the CY7C67300 in a standalone mode, providing USB Host support to a PSoC5.  I need to STREAM 32,000 bytes per second into a file I write to a USB Flash Drive.   So far, communication timing issues limit me to 4452 Bps.

Thanks,
Helmut

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My main question is above, but here's some additional info.  Perhaps you're interested in reading it and commenting.

First, prior experience writing to a FAT file system on SD card educated me about a couple things.  The traditional fileio.c code reads a block before writing it, even if you're writing a whole block.  This was very wasteful.  In the past, I modified the fileio.c to have what today I'll call a streaming mode, where I bypassed the initial block read (per a global flag, argh!) when writing this stream.  In addition, I found that when a cluster got full and a new cluster needed to be allocated, the code spent "forever" handling the file allocation table and such.  I had to simply make sure I was faster than my needed average speed, and then had a buffer large enough to handle the pause that occurs during cluster allocation.  

Second, current experience divides the PSoC5-SPI-CY7C67300 communication into three levels, based on support code from AN15484.  High level "command" operations are self-timed by waiting on the GPIO25 interrupt.  Mid level "transaction" operations are self-timed by waiting on the GPIO24 interrupt.  Low level "byte" transfers must be both separated and followed as a group by arbitrary delays.  This is "nasty" and not well behaved.  This is why I can't get beyond 4452 Bps (B/sec).  Meanwhile, my PC can write the same flash drive at about 6.7 MB/sec, so I know it's not the flash drive.  Do you have any insight or advice on this?

Third, I've been doing all this from the AN15484 app note and using it's pre-compiled support code in the CY7C76300.  I have not yet studied the CY7C76300 datasheet or looked for technical manuals on this chip.  My custom board design was derived from the app note as well, so I didn't really need to consult the datasheet much at all.  So, any advice on where to find such technical manuals?  The chip product page doesn't lead to much of use for this purpose, other than the CY4640 reference design.  Looking again at that right now, I see the installed Docs folder.  I don't immediately find much "overview".  I do read in the datasheet that SPI can use DMA and up to 2Mbps slave clock, both germane.  I don't find anything else about SPI communications.

Thanks very much,

Helmut

Dear,

I am zhangyj, I have developed a project, that using CY7C68013A in slaveFIFO mode. Now I want to download the firmware to EEPROM,

I have created the IIC file by hex2bix, and download it to EEPROM.

USB device can be detected, and enumerate two times, but  the firmware can not work, if I use USB cable download the firmware to 68013 directly, it will work.

Anyone can help me, thanks!

 I'm getting NOWHERE very FAST!  My biggest problem is that there seems to be nothing out there consistent with AN15484 "USB Flash Drive Controller Using SPI", including this app note itself any more!  On a MyCases ticket I was assured I wouldn't get hung up, but here I am, hung up.

While I have many details, I'll sum up here:  

(A) The cyusbgen.sys driver for the CY7C67300 via port 2A seems NOT compatible with Windows 7.

(B) AN15484 says to modify code or just use MSC_EEPROM_scan_LCP_v2.bin that comes with the app note.  Well, I can't find that bin directly, I can't find the app note that I downloaded on 8/3/12 (today is 10/25/12), I've installed CY4640 and the code is close, but makes a co-processor-boot bin, not an eeprom-boot bin, CY3663 won't install on Windows 7 but when installed on Vista Basic, it doesn't have the source code or bin either, contrary to what AN15484 says.

Please help!  I'm sinking...

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Here's some detail from a MyCases ticket.  I'm so anxious I can't simply wait for a response on the ticket.  My deadline is too short.  Please bear with me for posting this again here...

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😞 I got my custom board with CY7C67300 only a couple of hours ago and I'm already stuck. I know your not responsible for my short deadline, but I need to be FINISHED with this by Wednesday, only 6 calendar days from now. Please help me get past the following roadblocks. I'm also trying to think ahead a little, so next time I get stuck, while working on this over the weekend, I may already have the answer from you! Thanks very much.

1) Note I have a copy of AN15484 "USB Flash Drive Controller Using SPI" that I downloaded in the past, but now I can't find it on your website anymore. Google has a reference to a page at cypress.com, but when I visit it, the page isn't found. I was hoping to find MSC_EEPROM_scan_LCP_V2.bin on that page, per what it says on page 2 (top right column) of the app note.

2) I can't find MSC_EEPROM_scan_LCP_v2.bin. I thought using it would save me from having to change and recompile the source, which is likely to have its own roadblocks. Can you provide me the file or a link to it? I believe it's exactly what I need, because the subject of AN15484 is exactly what I want to do.

3) I have connected the CY7C67300 port 2A to my PC via USB cable and it enumerates as CYPRESS EZ-OTG. However, the driver isn't found. I've installed CY3663 and find cy_dev.inf (10/28/2004) and cyusbgen.sys (11/26/2002) at c:\Cypress\USB\OTG-Host\Drivers. From the device manager I try to update the driver and point to this folder, but I get an error, "Windows could not find driver software for your device". Note I'm running Windows 7 SP1.

4) I have run bash then QTUI2C with no parameters, to successfully get the program help output. Will QTUI2C with proper parameters be able to access the CY7C67300 as is without proper driver? Or do I need that driver setup correctly first? I assume I need the driver, plus please let me know if I'm mistaken.

I'm going to go ahead and post this case. Rather than simply waiting for a reply, of course, I'm going to start trying stuff. Please check for followup posts on this case, where I may have yet additional questions.

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Please note that QTUI2C and the .inf/.sys files I found came from installing CY4640, not CY3663. I have not CY3663 install, perhaps because I can't get a CD.

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