Identifier selection

摘要

A data processing apparatus is provided which is configured to select 2M selected identifiers within a possible range of up to 2N identifiers, where M≦N. The data processing apparatus comprises a selection storage unit configured to store at least N+1 identifier selection bits, wherein a position of a first marker bit in the at least N+1 identifier selection bits determines M, and an identifier selection unit configured to determine the 2M selected identifiers. The 2M selected identifiers fall within a range defined by a base identifier and a ceiling identifier. N-M bits of the N+1 identifier selection bits form N-M bits of the base identifier, and M zeroes form a further M bits of the base identifier. The ceiling identifier corresponds to the base identifier, except that the M zeroes of the base identifier are replaced by M ones.

主权项

1. A data processing apparatus configured to select 2M selected identifiers within a possible range of up to 2N identifiers, where M≦N, said data processing apparatus comprising:
storage circuitry configured to store at least N+1 identifier selection bits, wherein a position of at least a first marker bit in said at least N+1 identifier selection bits determines M; and selection circuitry configured to determine said 2M selected identifiers, wherein said 2M selected identifiers fall within a range defined by an associated base identifier and a ceiling identifier, wherein N-M bits of said at least N+1 identifier selection bits form N-M bits of said associated base identifier, and M zeroes form a further M bits of said associated base identifier, wherein said ceiling identifier corresponds to said associated base identifier with said M zeros that form M bits of said associated base identifier replaced with ones.