MAC7200 datasheet(396/976 Pages) FREESCALE

396 / 976 page

MAC7200 Microcontroller Family Reference Manual, Rev. 2

318

Freescale Semiconductor

slave port to inactive states when no master is requesting an access. The low power park feature can result

in an overall power savings if the slave port is not saturated; however, it will force an extra clock of latency

whenever any master tries to access it when it is not in use because it will not be parked on any master.

The PARK bits determine which master the slave will park on when no master is making an active request

and there is no request for low power mode. Please use caution to only select master ports that are actually

present in the design.

Table 15-6. Control Register Summary

CR_FC

CR_FB

CR_RC

CR_AHB

CR_PC

Control Register for Slave Port to Flash Controller

Control Register for Slave Port to FlexBus

Control Register for Slave Port to RAM Conttroller

Control Register for Slave Port to external AHB

Control Register for Slave Port to Peripheral Controller

crossbar_base + 0x010

crossbar_base + 0x110

crossbar_base + 0x310

crossbar_base + 0x510

crossbar_base + 0x710

Bit

Name

HLP

Type

rw1

1. Once this bit is written to a 1 only hardware reset will return it to a 0.

rrrrrrrrrrrr

Reset

000000000000

Bit

9876543210

Name

ARB

PCTL

Park

Type

Reset

000000000000

Table 15-7. Control Register Descriptions

Name

Description

Read Only. This bit is used to force all of a slave port’s registers to be read only. Once written to 1 it can only be

cleared by hardware reset.

This bit is initialized by hardware reset. The reset value is 0.

0 All this slave port’s registers can be written.

1 All this slave port’s registers are read only and cannot be written (attempted writes have no effect and result in an

error response).

HLP

Halt Low Priority. This bit is used to set the initial arbitration priority for low power mode requests.

This bit is initialized by hardware reset. The reset value is 0

0 The low power mode request has the highest priority for arbitration on this slave port.

1 The low power mode request has the lowest initial priority for arbitration on this slave port.

29–10

Control Register Reserved. These bits are reserved for future expansion. They read as zero and should be written

with zero for upward compatibility.

9–8

ARB

Arbitration Mode. These bits are used to select the arbitration policy for the slave port.

These bits are initialized by hardware reset. The reset value is 00.

00 Fixed Priority.

01 Round Robin (rotating) Priority.

10 Reserved

11 Reserved

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