drbg_csrng_seed_adapter

Pack 32-bit entropy words into queued 384-bit CSRNG seeds.

Uses prim_packer_fifo to accumulate twelve 32-bit words into one 384-bit seed with the required lane mapping, then stores complete {es_fips, es_bits} entries in a small same-clock FIFO. The wrapped CSRNG consumes queued entries through the native entropy_src_hw_if_req_t / entropy_src_hw_if_rsp_t interface.

Parameters

Table 1. Parameters
Name	Type	Default	Description
`SEED_FIFO_DEPTH`	`int unsigned`	`DrbgDefaultSeedFifoDepth`	Number of complete seeds that can be queued.

Ports

Table 2. Ports
Name	Direction	Type	Description
`clk_i`	input	`logic`	System clock.
`rst_ni`	input	`logic`	Async reset, active-low.
`csrng_word_valid_i`	input	`logic`	Incoming entropy-word valid.
`csrng_word_data_i`	input	`logic [31:0]`	Incoming 32-bit entropy word.
`csrng_word_ready_o`	output	`logic`	Packer ready for a word; low while the packer holds a complete seed that the seed FIFO has not accepted.
`entropy_src_hw_if_req_i`	input	`entropy_src_pkg::entropy_src_hw_if_req_t`	CSRNG seed-request handshake.
`entropy_src_hw_if_rsp_o`	output	`entropy_src_pkg::entropy_src_hw_if_rsp_t`	CSRNG seed response with bits and fips; es_ack is combinational, high when es_req is high and a seed is queued.
`seed_queue_valid_o`	output	`logic`	Seed FIFO not empty.
`seed_queue_bits_o`	output	`logic [383:0]`	Next queued 384-bit seed; zero when the FIFO is empty.
`seed_queue_fips_o`	output	`logic`	FIPS flag for the next seed, the provisional policy constant DrbgCsrngSeedFipsProvisional; zero when the FIFO is empty.
`seed_push_o`	output	`logic`	Pulse when a seed is pushed.
`packer_word_count_o`	output	`logic [4:0]`	Words accumulated in the packer, 0 to 12.
`seed_queue_depth_o`	output	`logic [$clog2(SEED_FIFO_DEPTH + 1)-1:0]`	Current seed-FIFO fill.