UM0434 datasheet(86/390 Pages) STMICROELECTRONICS

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UM0434

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HID1 fields are described in

Table 62.

4.14

Branch target buffer (BTB) registers

This section describes the only register that controls the branch target buffer.

4.14.1

Branch unit control and status register (BUCSR)

BUCSR, shown in

Table 63, is for general control & status of the branch target buffer (BTB).

BUCSR fields are described in

Table 64.

Table 61.

Hardware implementation dependent register 1 (HID1)

Field

—

ATS

–

ARD

Reset

All zeros

R/W

SPR

SPR 1009

Table 62.

HID1 field descriptions

Bits

Name

Description

32–55

—

Reserved, should be cleared.

ATS

Atomic status (read-only). Indicates state of the reservation bit in the load/store unit.

See

Chapter 5.7: Memory synchronization and reservation instructions on page 111.”

57–62

—

Reserved, should be cleared.

ARD

Address retraction disable.

0 Address retraction enabled.

1 Address retraction disabled.

Controls Address Retraction operation. For details, see

Chapter 9.5.3: Address retraction on

page 282.”

Table 63.

Branch unit control and status register (BUCSR)

Field

—

BBFI

—

BPEN

Reset

All zeros

R/W

SPR

SPR 1013

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