direction: right

pe: PE {
  style.fill: "#f8f9fa"
  style.stroke: "#495057"
  style.border-radius: 8

  cpu: PE_CPU (control) {
    style.fill: "#bbdefb"
    style.stroke: "#1565c0"
    style.border-radius: 4
  }

  sched: PE_SCHED (dispatch) {
    style.fill: "#bbdefb"
    style.stroke: "#1565c0"
    style.border-radius: 4
  }

  ipcq: IPCQ Controller (NEW) {
    style.fill: "#e1f5fe"
    style.stroke: "#0277bd"
    style.border-radius: 6
    style.stroke-width: 2

    ptrmgmt: Pointer Mgmt {
      style.fill: "#b3e5fc"
      style.stroke: "#0277bd"
      style.border-radius: 4

      qprf: QPair Reg File
      bp: Backpressure
      sag: Slot Addr Gen
    }

    sideband: Sideband {
      style.fill: "#b3e5fc"
      style.stroke: "#0277bd"
      style.border-radius: 4

      metax: Meta Extractor
      crinj: Credit Injector
      crrcv: Credit Receiver
    }
  }

  dma: PE_DMA (MOD) {
    style.fill: "#fff3e0"
    style.stroke: "#e65100"
    style.border-radius: 6

    compute_port: compute port {
      style.fill: "#ffe0b2"
      style.stroke: "#e65100"
      style.border-radius: 4
    }
    ipcq_port: IPCQ port {
      style.fill: "#ffe0b2"
      style.stroke: "#e65100"
      style.border-radius: 4
    }
    wrr: WRR Arbiter (NEW) {
      style.fill: "#ffcc80"
      style.stroke: "#e65100"
      style.border-radius: 4
      style.stroke-width: 2
    }

    compute_port -> wrr
    ipcq_port -> wrr
  }

  fs: PE_FETCH_STORE {
    style.fill: "#c8e6c9"
    style.stroke: "#2e7d32"
    style.border-radius: 4
  }

  tcm: TCM (16MB SRAM) {
    style.fill: "#fce4ec"
    style.stroke: "#c62828"
    style.border-radius: 6

    work: Kernel Working Memory {
      style.fill: "#f8bbd0"
      style.stroke: "#c62828"
      style.border-radius: 4
    }
    slot: IPCQ Slot Region (rsv) {
      style.fill: "#f48fb1"
      style.stroke: "#c62828"
      style.border-radius: 4
      style.stroke-width: 2
    }
  }

  gemm: GEMM engine {
    style.fill: "#c8e6c9"
    style.stroke: "#2e7d32"
    style.border-radius: 4
  }

  math: MATH engine {
    style.fill: "#c8e6c9"
    style.stroke: "#2e7d32"
    style.border-radius: 4
  }

  fport: Fabric Port {
    style.fill: "#ffe0b2"
    style.stroke: "#e65100"
    style.border-radius: 4
  }

  # Control
  cpu -> sched: cmd dispatch
  cpu -> ipcq: MMIO

  # Compute pipeline
  sched -> dma.compute_port: TileToken
  dma -> fs: TileToken
  dma <-> tcm.work: DMA_READ/WRITE\n(HBM ↔ TCM)
  fs <-> tcm.work: fetch/store\n(TCM ↔ reg)
  fs -> gemm: TileToken
  fs -> math: TileToken
  gemm -> fs: TileToken
  math -> fs: TileToken

  # IPCQ data path
  ipcq -> dma.ipcq_port: IpcqDmaToken {style.stroke: "#0277bd"}
  dma -> ipcq.sideband.metax: IpcqMetaArrival {style.stroke: "#0277bd"}

  # IPCQ slot R/W
  dma <-> tcm.slot: slot read/write {
    style.stroke: "#0277bd"
    style.stroke-dash: 3
  }

  # Credit via fabric port
  ipcq.sideband.crinj -> fport: credit out (16B) {
    style.stroke: "#7b1fa2"
    style.stroke-dash: 5
  }
  fport -> ipcq.sideband.crrcv: credit in (16B) {
    style.stroke: "#7b1fa2"
    style.stroke-dash: 5
  }

  # DMA ↔ Fabric
  dma.wrr <-> fport
}

noc: NoC Router {
  style.fill: "#f3e5f5"
  style.stroke: "#6a1b9a"
  style.border-radius: 6
}

ext: Other PEs / Cubes / SIPs {
  style.fill: "#ede7f6"
  style.stroke: "#6a1b9a"
  style.border-radius: 6
}

pe.fport <-> noc
noc <-> ext