OPENCORES.ORG

Hi All,

It is implemented. But you only get 32 of the 64 bits in the mac 
regiser. In the file or1200_mult_mac.v you can change which bits that is 
returned by l.macrc. Default is "result = mac_r[59:28];"

- Patrik

michael scott skrev:
> Hi All,
>          Can anybody confirm if the instructions l.mac/lmac.i/l.macrc are
> fully implemented in
> or1200 assuming my defines are set correctly ?
> 
> `define OR1200_MAC_IMPLEMENTED
> `define OR1200_MULT_IMPLEMENTED
> `define OR1200_IMPL_DIV
> `define OR1200_MAC_ADDR     0
> `define OR1200_MAC_SPR_WE
> 
> (all uncommented defines)
> 
> I've had some success with l.mac in that I can run the attached code and see
> the internal signal 'mac_r' increase in increments of 14 (as expected)
> but on issuing l.macrc r4 I can't seem to extract the final value to r4
> (even though it's correct)
> 
> If I replace the instruction l.mac r2,r6 with l.maci r2,0x07 the
> mac_r doesn't increment as before but extracting the final via l.macrc r4
> does work
> 
> no problems with l.mul/l.div though !
> 
> Regards,
> 
> Mike Scott
> 
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> 
> 
> 
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Patrik Thalin
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Signal Processing Devices Sweden AB
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