RE: [oc] verilog CAN core implementation issues

["Igor Mohor\(opencores\)" <igorm@opencores.org>]

> -----Original Message-----
> From: owner-cores@opencores.org [mailto:owner-cores@opencores.org] On
> Behalf Of Uwe Bonnes
> Sent: Friday, June 13, 2003 5:55 PM
> To: cores@opencores.org
> Subject: Re: [oc] verilog CAN core implementation issues
> 
> >>>>> "anthonymarino" == anthonymarino  <anthonymarino@ieee.org>
writes:
> 
> ...
>     anthonymarino> WARNING:NgdBuild:526 - On the RAMB4_S8_S8 symbol
>     anthonymarino> "i_can_bsp/i_can_fifo/fifo", the following
properties
> are
>     anthonymarino> undefined: INIT_00, INIT_01, INIT_02, INIT_03,
INIT_04,
>     anthonymarino> INIT_05, INIT_06, INIT_07, INIT_08, INIT_09,
INIT_0A,
>     anthonymarino> INIT_0B, INIT_0C, INIT_0D, INIT_0E, INIT_0F. A
default
>     anthonymarino> value of all zeroes will be used.
> 
> Harmless: A warning that you didn't specified default values for the
> blockram

Function that initializes all RAMs was added to the latest version of
the CAN. All RAMs are initialized to zero.


> 
>     anthonymarino>  ERROR:NgdBuild:604 -
>     anthonymarino> logical block 'i_can_registers' with type
>     anthonymarino> 'can_registers'is unexpanded. Symbol
'can_registers' is
>     anthonymarino> not supported in target 'spartan2'.
> 
> This looks fishy. Try to understand what the author wanted to do.
Probably
> the syntax is problematic.

Say what? Everything fully works in hardware. What problematic syntax?
Come directly to me and we'll work it out. I assume you forgot to
compile
Something?


> 
>     anthonymarino> WARNING:NgdBuild:454
>     anthonymarino> - logical net 'set_bus_error_irq' has no load
>     anthonymarino> WARNING:NgdBuild:452 - logical net 'tx_request' has
no
>     anthonymarino> driver WARNING:NgdBuild:452 - logical net
> 'tx_data_4<0>'
>     anthonymarino> has no driver
> 
> "no driver" means that you use a signal where there is no gate that
> provides
> the output. Probably some typing error.
> 
> "no load" means that some signal is generated, but never consumed.
> 
> Try to understand all those issues.

You got all this warnings/errors because of the "can_registers
unexpanded" warning.
Again, come back to me with more details and we'll work it out.


Regards,
	Igor


> 
> Bye
> --
> Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de
> 
> Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
> --------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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