USB Emulator Schematic - 16 Mhz Osc. not correct?

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average_male
Posts: 26
Joined: Tue Apr 06, 2010 7:21 am

USB Emulator Schematic - 16 Mhz Osc. not correct?

Post by average_male »

Hello Jeff (or anybody else that can assist),

Looking at the USB schematic(1) for the USB emulator, the crystal callouts and/or connections don't look correct.

First of all, the pins are numbered 11, 14, 7, and 8, Ok so the 11 must be a typo and should be a 1, but the datasheet states that it should be disconnected, but it looks to be tied to VCC with pin 14 and the PCB picture(2) seems to show that pin 1 is disconneted. So I guess this is a drafting error on the schematic?

Can you please confirm?

Thanks,
Moe

Reference:
(1) - https://hxc2001.com/floppy_drive_emulat ... muCPLD.gif

(2)- In the zip file: /HxCFloppyEmulator_ipcore\PCB\USB_HxCFloppyEmulator_PCB\prod_version_revc/HxCFloppyEmulator_BOTTOM.jpg
Jeff
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Re: USB Emulator Schematic - 16 Mhz Osc. not correct?

Post by Jeff »

average_male wrote:Hello Jeff (or anybody else that can assist),

Looking at the USB schematic(1) for the USB emulator, the crystal callouts and/or connections don't look correct.

First of all, the pins are numbered 11, 14, 7, and 8, Ok so the 11 must be a typo and should be a 1, but the datasheet states that it should be disconnected, but it looks to be tied to VCC with pin 14 and the PCB picture(2) seems to show that pin 1 is disconneted. So I guess this is a drafting error on the schematic?

Can you please confirm?

Thanks,
Moe

Reference:
(1) - https://hxc2001.com/floppy_drive_emulat ... muCPLD.gif

(2)- In the zip file: /HxCFloppyEmulator_ipcore\PCB\USB_HxCFloppyEmulator_PCB\prod_version_revc/HxCFloppyEmulator_BOTTOM.jpg
On the schematic you should read "11" and not "1". But a wire hide one character.
Except this, there is no problem.
average_male
Posts: 26
Joined: Tue Apr 06, 2010 7:21 am

Re: USB Emulator Schematic - 16 Mhz Osc. not correct?

Post by average_male »

that seems odd as the OSC/Crystal that you noted in the parts list doesn't seem to have a pin number 11, and that datasheets say that pin 1 should be NC (Not Connected), guess you maybe referencing a different osc/crystal.

Thanks for your response.

Part list item I was noting above:
5V 16MHZ oscillator (DIL14 or DIL8 format)
(farnell: 9510052)
Jeff
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Location: Paris
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Re: USB Emulator Schematic - 16 Mhz Osc. not correct?

Post by Jeff »

average_male wrote:that seems odd as the OSC/Crystal that you noted in the parts list doesn't seem to have a pin number 11, and that datasheets say that pin 1 should be NC (Not Connected), guess you maybe referencing a different osc/crystal.

Thanks for your response.

Part list item I was noting above:
5V 16MHZ oscillator (DIL14 or DIL8 format)
(farnell: 9510052)
No no there are no problem... This is a double footprint part on the pcb , like the sram.
the pin 11 is for small oscillator.
have a look to the pcb you will understand.
average_male
Posts: 26
Joined: Tue Apr 06, 2010 7:21 am

Re: USB Emulator Schematic - 16 Mhz Osc. not correct?

Post by average_male »

Yep, I see you have designed the PCB to work with Full and Half can packaged crystal oscillators. I guess I was expecting to see pin 1 as NC as you have noted NC on all other ICs when applicable. The combination of the two above details left room for some confusion. I am with you now.

Thanks again for addressing my quesitons in such a timely manner. You do good work.
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