Intel
®
Core
TM
i7-620LE/UE, i7-610E, i5-520E and Intel
®
Celeron
®
Processor P4500, P4505 Series
April 2010
Datasheet Addendum
Document Number: 323178-002
69
Processor Configuration Registers
6
Processor Configuration
Registers
This chapter is an Addendum to the
Intel® Core
TM
i7-600, i5-500 and i3-300 Mobile
Processor Series Datasheet.
Contained in this chapter is any register information that is
specific to the Intel
®
Core
TM
i7-620LE/UE, i7-610E, i5-520E and Intel
®
Celeron
®
Processor P4500, P4505 Series. For all other register information not contained in this
chapter please refer to the
Intel® Core
TM
i7-600, i5-500 and i3-300 Mobile Processor
Series Datasheet
.
6.1
Register Terminology
The following table shows the register-related terminology that is used in this
document.
Table 14. Register Terminology (Sheet 1 of 2)
Item
Description
RO
Read Only bit(s).
Writes to these bits have no effect. These are static values
only.
RO-V
Read Only/Volatile bit(s).
Writes to these bits have no effect. These are
status bits only. The value to be read may change based on internal events.
RO-V-S
Read Only/Volatile/Sticky bit(s).
Writes to these bits have no effect.
These are status bits only. The value to be read may change based on internal
events. Bits are not returned to their default values by “warm” reset, but is
reset with a cold/complete reset (for PCI Express* related bits a cold reset is
“Power Good Reset” as defined in the
PCI Express Base Specification
).
AF
Atomic Flag bit(s).
The first time the bit is read with an enabled byte, it
returns the value 0, but a side-effect of the read is that the value changes to
1. Any subsequent reads with enabled bytes return a 1 until a 1 is written to
the bit. When the bit is read, but the byte is not enabled, the state of the bit
does not change, and the value returned is irrelevant, but will match the state
of the bit.
When a 0 is written to the bit, there is no effect. When a 1 is written to the bit,
its value becomes 0, until the next byte-enabled read. When the bit is written,
but the byte is not enabled, there is no effect.
Conceptually, this is “Read to Set, Write 1 to Clear.”
RW
Read/Write bit(s).
These bits can be read and written by software.
Hardware may only change the state of this bit by reset.
RW1C
Read/Write 1 to Clear bit(s).
These bits can be read. Internal events may
set this bit. A software write of 1 clears (sets to ‘0’) the corresponding bit(s)
and a write of 0 has no effect.
RW1C-L-S
Read/Write 1 to Clear/Lockable/Sticky bit(s).
These bits can be read.
Internal events may set this bit. A software write of 1 clears (sets to ‘0’) the
corresponding bit(s) and a write of 0 has no effect. Bits are not cleared by
“warm” reset, but is reset with a cold/complete reset (for PCI Express related
bits a cold reset is “Power Good Reset” as defined in the PCI Express Base
spec). Additionally there is a Key bit (which is marked RW-K or RW-L-K) that,
when set, prohibits this bit field from being writable (bit field becomes Read
Only/Volatile).