UM0434 datasheet(94/390 Pages) STMICROELECTRONICS

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UM0434

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MAS3 fields are defined in

Table 80.

The MAS4 register, shown in

Table 81, contains fields for specifying default information to

be pre-loaded on certain MMU related exceptions.

The MAS4 fields are defined in

Table 82.

Table 79.

MMU assist register 3 (MAS3)

Permission bits

51 52 53 54 55 56 57 58 59

62 63

Field

RPN

—

U0U1 U2U3UX SX UW SW UR SR

Reset

Undefined on

m_por assertion, unchanged on p_reset_b assertion

R/W

SPR

SPR 627

Table 80.

MAS3 - RPN and access control

Bits

Name

Description

32–51

RPN

Real page number.

Only bits that correspond to a page number are valid. Bits that represent offsets within a page

are ignored and should be zero.

52–53

—

Reserved, should be cleared.

54–57

U0–U3

User bits.

58–63 PERMIS Permission bits (UX, SX, UW, SW, UR, SR).

Table 81.

MMU assist register 4 (MAS4)

SPR

628

Access: Supervisor read/write

32 33 34

35 36

39 40

47 48

51 52

55 56 57

59 60 61

—

TLBSELD

—

TIDSELD

—

TSIZED

—

VLED WD ID MD GD ED

Reset

All zeros

Table 82.

MAS4 - hardware replacement assist configuration register

Bits

Name

Description

32–33

—

Reserved, should be cleared.

34–35 TLBSELD

Default TLB selected.

01 TLB1 (ignored by the e200z3, should be written to 01 for future compatibility)

36–43

—

Reserved, should be cleared.

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