Adding static delay across diplomacy nodes

[Varun Gandhi]

Hi,

I’m trying to understand the underlying behavior of various connectors available in Diplomacy. I’m currently trying to modify the TLArbiter object in TileLink, and I want to add a static delay between the source and sink, and trying the following code snippet:

def applyCancel[T <: Data](policy: Policy)(sink: ReadyValidCancel[T], sources: (UInt, ReadyValidCancel[T])*): Unit = {

    if (sources.isEmpty) {

      // boilerplate code

    } else if (sources.size == 1) {

      

sink :<> sources.head._2

   

 } else {

      // multi-source arbitration

When I modify the above line (in bold) to add static delay using ShiftRegister: sink :<> ShiftRegister(sources.head._2, 1)

I get several errors of the following type: Register r_1 cannot be a bundle type with flips.

What could be a potential way to add a static delay between a source and a sink node? 

Thanks,

Varun

[Jerry Zhao]

Could you clarify what the "source" and "sink" nodes you are referring to are?

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Jerry Zhao

[Varun Gandhi]

Hi Jerry,

I’m trying to modify the following TLAbirter code in Arbiter.scala: https://github.com/chipsalliance/rocket-chip/blob/44b0b8249279d25bd75ea693b725d9ff1b96e2ab/src/main/scala/tilelink/Arbiter.scala#L80

If I’m understanding the chisel code correctly, the applyCancel function is not limited to any particular type of node but applies to any source/sink node with a ReadyValidCancel interface. Am I missing something here?

Best,

Varun

[Gandhi, Varun]

Hi,

I'd appreciate some pointers on how to add a static delay between interconnected diplomacy nodes at the arbiter level. Are there any tutorials anyone can point me to?

Thanks,

Varun