GXM datasheet(55/244 Pages) NSC

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Processor Programming (Continued)

Table 3-15. TR7-TR6 Bit Definitions

Bit

Name

Description

TR7 Register

TLB Test Data Register (R/W)

31:12

Physical

Address

Physical Address:

TLB lookup: Data field from the TLB.

TLB write: Data field written into the TLB.

11:10

RSVD

Reserved: Set to 0.

9:7

TLB LRU

LRU Bits:

TLB lookup: LRU bits associated with the TLB entry before the TLB lookup.

TLB write: Ignored.

4PL

PL Bit:

TLB lookup: If PL = 1, read hit occurred. If PL = 0, read miss occurred.

TLB write: If PL = 1, REP field is used to select the set. If PL = 0, the pseudo-LRU replacement algorithm

is used to select the set.

3:2

REP

Set Selection:

TLB lookup: If PL = 1, this field indicates the set in which the tag was found. If PL = 0, undefined data.

TLB write: If PL = 1, this field selects one of the four sets for replacement. If PL = 0, ignored.

1:0

RSVD

Reserved: Set to 0.

TR6 Register

TLB Test Control Register (R/W)

31:12

Linear

Address

Linear Address:

TLB lookup: The TLB is interrogated per this address. If one and only one match occurs in the TLB, the

rest of the fields in TR6 and TR7 are updated per the matching TLB entry.

TLB write: A TLB entry is allocated to this linear address.

Valid Bit:

TLB write: If V = 1, the TLB entry contains valid data. If V = 0, target entry is invalidated.

10:9

8:7

6:5

D, D#

U, U#

R, R#

Dirty Attribute Bit and its Complement (D, D#)

User/Supervisor Attribute Bit and its Complement (U, U#)

Read/Write Attribute Bit and its Complement (R, R#)

Effect on TLB Lookup

Effect on TLB Write

00 =

Do not match

Undefined

01 =

Match if D, U, or R bit is a 0

Clear the bit

10 =

Match if D, U, or R bit is a 1

Set the bit

11 =

Match if D, U, or R bit is either a 1 or 0

Undefined

4:1

RSVD

Reserved: Set to 0.

Command Bit:

If C = 1: TLB lookup.

If C = 0: TLB write.

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