Functional Features - Texas Instruments OMAP5910 Technical Reference Manual

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MPU Interface

Functional Features

The MPUI supports the following features:

Four access modes:

Single-access mode (SAM) for SARAM, DARAM, memory interface

Single-access mode (SAM) for peripheral bus access

Host-only mode (HOM) for SARAM access

Host-only mode (HOM) for peripheral bus access

An interrupt sent to the TI925T if a time-out occurs

Programmable priority scheme (TI925T, DMA, etc.) that must be config-

ured during the system boot process

Packing and unpacking (16-bits to 32-bits, and vice versa)

32-bit single access support

Software control endianism conversion (default is word swap for all

access, byte swap for memory access only)

DMA access to full memory space (16M bytes)

DMA access to the DSP peripheral bus shared peripherals (up to 128K

In host-only mode (HOM), the MPUI interface does not have access to the

DARAM (0x00 0000 to 0x00 FFFF). All SARAM (0x01 0000 to 0x04 FFFF) is

accessible by the MPUI, but the type of access depends on the DSP status

(HOM or single-access mode (SAM)) and on the MPUI size register

(DSP_API_CONFIG). The following rules apply:

Before the MPU reset (resetting the DSP MPUI logic) is released, the

MPUI cannot access any SARAM.

After the MPU reset is released and before the DSP reset is released,

the DSP is in HOM. The default MPUI size register value (after the

MPU_nRESET is released) is 0xFFFF, and the MPUI has exclusive

access to all SARAM.

Shared access: Both the DSP and MPU can access MPUI memory, but

the memory space they access is mutually exclusive. The MPUI register

controls which memory space (SARAM0, 1, 2...) is accessed by the DSP

After the DSP reset is released, the DSP goes automatically into SAM;

consequently, whatever the value of the MPUI size register, all SARAM is

shared between the DSP and the MPUI.