scrambler_addr_tweak

Expand a narrow address and XOR it with the scrambler key to form a round key.

For ADDR_WIDTH 8 through 13 and 16 the address is concatenated with itself until 32 bits are formed, the last copy keeping only its most significant bits; a 32-bit address is used as is, and any other width is zero-extended. The address must be 32 bits wide or less. round_key_o is that expansion XORed with scrambler_key_i.

Parameters

Table 1. Parameters
Name	Type	Default	Description
`ADDR_WIDTH`	`int unsigned`	`32`	Input address width; must be <= 32.

Ports

Table 2. Ports
Name	Direction	Type	Description
`addr_i`	input	`logic [ADDR_WIDTH-1:0]`	Plaintext address to expand.
`scrambler_key_i`	input	`logic [31:0]`	32-bit scrambler key.
`round_key_o`	output	`logic [31:0]`	Expanded address XOR key.