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Rocket/coreplex/PeripheryBus

The periphery bus for IO devices.

case class PeripheryBusParams

Parameters used by the peripherial bus.

case class PeripheryBusParams(
  beatBytes: Int,
  blockBytes: Int,
  masterBuffering: BufferParams = BufferParams.default,
  slaveBuffering: BufferParams = BufferParams.none,
  arithmetic: Boolean = true,
  frequency: BigInt = BigInt(100000000) // 100 MHz as default bus frequency
) extends TLBusParams {
}
  • beatBytes Int (param) number of bytes per beat.
  • blockBytes Int (param) number of bytes per burst.
  • masterBuffering BufferParams.default (param) buffer depth on the master (inner) side.
  • slaveBuffering BufferParams.none (param) buffer depth on the slave (outer) side.
  • arithmetic true (param) support arithmetic atomic operations.
  • frequency BigInt(100000000) (param) 100MHz as default bus frequency.

class PeripheryBus

class PeripheryBus(params: PeripheryBusParams)(implicit p: Parameters) extends TLBusWrapper(params)
  • toFixedWidthSingleBeatSlave (w:Int) => TLOutwardNode attach a fragmenter to change beat size to w.
  • toLargeBurstSlave (m:Int) => TLOutwardNode attach a fragmenter to change block size to m.
  • fromSystemBus () => TLInwardNode get the peripheral bus inward port attached with an atomic automata.

The internal connections:

                 [atomics]       master_buffer      xbar      slave_buffer       slave_ww           []
systemBus ==> -------------- ==> ------------- *==> ---- ==>* ------------ ==>* ----------- ==> ---------- ==> FixWidthSlave
              AtomicAutomata         Buffer         Xbar          Buffer  |     WidthWidget     Fragmenter
                                                                          |
                                                                          |                         []
                                                                          \---------------- ==> ---------- ==> LargeBurstSlave
                                                                                                Fragmenter

trait HasPeripheryBus

Provides buses that serve as attachment points, for use in traits that connect individual devices or external ports.

  • pbus PeripheryBus the peripheral bus.




Last updated: 10/08/2017
CC BY-NC-SA 4.0, © (2017) Wei Song
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