64-bit address terminology

When referring to 64-bit addresses in this chapter:

A clean 24-bit address refers to binary zeros in the high-order 5 bytes followed by a 24-bit address in the low-order 3 bytes, that is, X’0000000000aaaaaa’
A clean 31-bit address refers to binary zeros in the high-order 4 bytes followed by a 31-bit address in the low-order 4 bytes, that is, X’00000000aaaaaaaa’ where Bit 32 of the 31-bit address must be 0.
A 64 bit address uses all 64-bits for the address.

The following summarizes the previous information:

Table 1. Summary of 64-bit Terminology for Exits
Summary of 64-bit Terminology for ExitsAddress	Bits 0-31	Bit 32	Bits 33-39	Bits 40-63
24-bit	0	0	0	Address
31-bit	0	0	Address
64-bit	Address