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//
// Copyright (c) 2026, Apollo Telephone Laboratories.
// Provided under the BSD-3 clause.
//
`ifndef BUS_ARI_SVH
`define BUS_ARI_SVH 1
//
// Number of bus segments / endpoints supported, this value
// should be bumped per every new device added to the chip.
//
parameter ARI_SEGMENT_COUNT = 3;
// Physical memory address bit-width
parameter PMA_XLEN = 32;
//
// ARI bus tags for determining payload type
//
// @ARI_NOP: No-operation, as per the spec
// @ARI_ADOP: Address operation
//
typedef enum logic [3:0] {
ARI_NOP,
ARI_ADOP
} AriTag;
//
// Address operation structure
//
// @ad: 48-bit physical address
// @data: Data to write (if write_en=1)
// @write_en: If set, this is a write operation
// @reserved: Reserved, must be zero
//
typedef struct packed {
logic [PMA_XLEN-1:0] ad;
logic [63:0] data;
logic write_en;
logic [14:0] reserved;
} AriAdop;
//
// Represents an ARI frame that encapsulates a payload.
// Refer to the ARI specification.
//
// @tag: Frame tag / kind
// @seq: Frame sequence
// @payload: Payload (reserved if tag = ARI_NOP)
//
typedef struct packed {
AriTag tag;
logic [3:0] seq;
logic [127:0] payload;
} AriFrame;
`endif // !BUS_ARI_SVH
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