Altera CLKLK_FB use when OPERATION_MODE=NORMAL

P

Paulo Valentim

Guest
Hi, I am currently using an APEX20KE device.

When using the altclklock megafunction, I use OPERATION_MODE = NORMAL.
I would like to know what is the function of the CLKLK_FB pin when in
this mode? Does it act as a normal I/O? Thanks a lot!

- Paulo Valentim
 
I put this up on altera's site. They answered:

OK, when the ALTCLKLOCK is in Normal mode, CLKLK_FB inputs are not
used by the PLL (i.e. the PLL ignores the external FB pin).

However, you cannot use the CLKFBIN pin (R6 for your device
EP20K200EFI484-2X) as a general purpose I/O, as it is a dedicated
input pin for use with the PLL only. (in the pinout file generated by
Quartus this pins usage will be designated with a GND+ which means
this pin should be connected to GND if unused.

Note however that pin P6 (CLKLK_FB2n) can be used as a general
purpose I/o, as this is not a dedicated input pin.

Take care!!!

- Paulo Valentim

prv3299@yahoo.com (Paulo Valentim) wrote in message news:<5ed45146.0406150200.44986214@posting.google.com>...
Hi, I am currently using an APEX20KE device.

When using the altclklock megafunction, I use OPERATION_MODE = NORMAL.
I would like to know what is the function of the CLKLK_FB pin when in
this mode? Does it act as a normal I/O? Thanks a lot!

- Paulo Valentim
Click to expand...
 
I put this up on altera's site. They answered:

OK, when the ALTCLKLOCK is in Normal mode, CLKLK_FB inputs are not
used by the PLL (i.e. the PLL ignores the external FB pin).

However, you cannot use the CLKFBIN pin (R6 for your device
EP20K200EFI484-2X) as a general purpose I/O, as it is a dedicated
input pin for use with the PLL only. (in the pinout file generated by
Quartus this pins usage will be designated with a GND+ which means
this pin should be connected to GND if unused.

Note however that pin P6 (CLKLK_FB2n) can be used as a general
purpose I/o, as this is not a dedicated input pin.

Take care!!!

- Paulo Valentim

prv3299@yahoo.com (Paulo Valentim) wrote in message news:<5ed45146.0406150200.44986214@posting.google.com>...
Hi, I am currently using an APEX20KE device.

When using the altclklock megafunction, I use OPERATION_MODE = NORMAL.
I would like to know what is the function of the CLKLK_FB pin when in
this mode? Does it act as a normal I/O? Thanks a lot!

- Paulo Valentim
Click to expand...
 
I put this up on altera's site. They answered:

OK, when the ALTCLKLOCK is in Normal mode, CLKLK_FB inputs are not
used by the PLL (i.e. the PLL ignores the external FB pin).

However, you cannot use the CLKFBIN pin (R6 for your device
EP20K200EFI484-2X) as a general purpose I/O, as it is a dedicated
input pin for use with the PLL only. (in the pinout file generated by
Quartus this pins usage will be designated with a GND+ which means
this pin should be connected to GND if unused.

Note however that pin P6 (CLKLK_FB2n) can be used as a general
purpose I/o, as this is not a dedicated input pin.

Take care!!!

- Paulo Valentim

prv3299@yahoo.com (Paulo Valentim) wrote in message news:<5ed45146.0406150200.44986214@posting.google.com>...
Hi, I am currently using an APEX20KE device.

When using the altclklock megafunction, I use OPERATION_MODE = NORMAL.
I would like to know what is the function of the CLKLK_FB pin when in
this mode? Does it act as a normal I/O? Thanks a lot!

- Paulo Valentim
Click to expand...
 
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