efuse_shadow_reg_access_control

Decode the per-field read and write locks that apply to a shadow-map byte address.

Look addr_i up in efuse_field_map_i and combine the field's software lock bits with its hardware lock bits from locks_i. The module is combinational and independent of the bus protocol; the caller decides which accesses the locks block.

LockVectorBits is 2*(EFUSE_FIELDS-1), with write-lock at 2n and read-lock at 2n+1 per real field. The LOCKS meta-field uses sentinel idx all-ones and is excluded from hw-lock checks, as is any unmapped address.

Parameters

Table 1. Parameters
Name	Type	Default	Description
`EFUSE_ADDR_WIDTH`	`int unsigned`	`12`	Width of the MAP window byte offset on addr_i.
`EFUSE_FIELDS`	`int unsigned`	`1`	eFuse field-map entry count.
`HAS_LC_STATE`	`bit`	`1'b0`	Set for SEP: field index 0 is the lifecycle-state field, exempt from hardware locks and reported on lc_state_access_o.
`LockVectorBits`	`int unsigned`	`2 * (EFUSE_FIELDS - 1)`	Hardware lock bits: a write and a read lock per field, excluding the LOCKS meta-field.

Ports

Table 2. Ports
Name	Direction	Type	Description
`secure_tm_i`	input	`logic`	Secure test mode, active-high; adds each field's secure-test-mode lock to the write lock.
`efuse_field_map_i`	input	`efuse_pkg::rule_t [EFUSE_FIELDS-1:0]`	Per-field byte ranges, lock indices, and software lock bits.
`locks_i`	input	`logic [LockVectorBits-1:0]`	Hardware lock bits from the shadow LOCKS words: write lock at 2n, read lock at 2n+1 for field n.
`addr_i`	input	`logic [EFUSE_ADDR_WIDTH-1:0]`	Byte offset within the MAP window, matched against the field byte ranges.
`write_locked_o`	output	`logic`	High when the addressed field is write locked by its hardware lock bit, its software lock bits, or its secure-test-mode lock.
`read_locked_o`	output	`logic`	High when the addressed field is read locked by its hardware or software lock bit.
`write_setup_only_o`	output	`logic`	High when the addressed field is set-only: writes may set bits but not clear them; low when its hardware write lock is set.
`lc_state_access_o`	output	`logic`	High when the address falls in the lifecycle-state field.