MAC7200 datasheet(413/976 Pages) FREESCALE

413 / 976 page

Initialization/Application Information

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

335

The third case that can cause an error response to the AHB is when an access is attempted to a location at

which there is no IP bus peripheral. In this case the AIPS does not initiate any IP bus activity but instead

responds by following the same abort procedure described above for a permissions violation.

16.6

Initialization/Application Information

The AIPS is configured at reset with all masters trusted for both reads and writes, all masters using their

supervisor access attribute, and all peripherals supervisor protected. After reset, a bus master may be used

to change the Master Privilege Registers (MPRs), the Peripheral Access Control registers (PACRs), and

the Off-platform Peripheral Access Control registers (OPACRs) as needed as described in Section 16.4.2,

“Control Registers.”

16.7

AIPS Bus Aborts

16.7.1

IPI Register Interface

The AIPS module supports Peripheral Bus bus aborts, and enforces the following memory map:

Address aborting in the AIPS is done only on a 32-bit address boundary.

Supervisor Access: All accesses to the AIPS registers must be in Supervisor Mode. All User Mode

accesses are aborted.

16.7.2

IPI Bridge Interface

In addition to the IPI interface, the AIPS can abort transfers through the bridge itself. The following

transfers will be aborted:

— User mode access to any AIPS slave with the corresponding SP bit set in the PACR/OPACR

— Write to any AIPS slave with the corresponding WP bit set in the PACR/OPACR register.

— Any access from an untrusted master to any AIPS slave with the corresponding TP bit set in

the PACR/OPACR register.

— Any access to an AIPS slave that is not implemented (i.e.-marked as “Reserved” in the

documentation)

(See Section 9.9, “Peripheral Bus Memory Map” for a list of PACR/OPACR registers)

Table 16-6. AIPS Bus Aborts

Abort

Allowed

$0000-$0007

$0008-$001f

$0020-$002f

$0030-$003f

$0040-$0057

$0058-$3fff

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