Re: [foxboro] How to reverse a 16 bit register - PAKIN


Is it possible to use an IIN DCI block?  If so, the block point parameters
can be configured to do exactly what you're looking for...


Steve



foxboro-bounce@xxxxxxxxxxxxx wrote on 03/31/2009 12:49:45 PM:

> We are converting gateways to FDSI. We need to reverse a two byte
> register (Bits 1 to 16).
> Our goal was to insert a PAKIN upstream of our MCIN & CIN, which
> used to read the MDSCAN.
> Below is from B0193AX - PAKIN, which reverses Bits 1 to 32 only.
> PKIOPT
> Packed Input Option is a short integer input that specifies whether the
> input bit stream from the device is packed in the PAKCIN output parameter
> with or without reversing the bit order as follows:
> 1 = No bit reversal (Bits 1 to 32 are mapped bit-by-bit to Bits 1 to 32)
> 3 = Bit reversal (Bits 1 to 32 are mapped bit-by-bit to Bits 32 to 1)
>
> Where is 2 = Bit reversal (Bits 1 to 16 are mapped bit-by-bit to
> Bits 16 to 1)????
>
> We are trying to emulate the MCIN blocks IOMOPT = 2, which allows
> reversing 16 bits.
> One option we found is the IIN block to read the register directly,
> then connect to a MCIN to allow bit selection - poor use of blocks.
>
> Thanks,
>
> bud/
>
>
>
>
>
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