Hom/Sam Change Outside Of Reset - Texas Instruments OMAP5910 Reference Manual

MPU Interface Port
9.2.2

HOM/SAM Change Outside of Reset

Figure 93. MPUI Mode Change Bits in ST3_55
15
7
Note: R = Read; W = Write; −n = Value after reset; −x = Value after reset is not defined.
196 DSP Subsystem
Only the DSP core can invoke a change between the host-only and
shared-access modes outside of reset. OMAP devices use two bits in the DSP
core's ST3_55 register to change between SAM_M and HOM_M and between
SAM_P and HOM_P: the HOM_R bit (bit 9) and the HOM_P bit (bit 8),
respectively (see Figure 93 and Table 84).
The mode change is initiated by a DSP core write to the HOM_P bit and/or the
HOM_R bit. When the appropriate bit is written to request the change, the
mode change is not reflected on the HOM_P and HOM_R bits until an internal
controller completes the mode switch. Therefore, the DSP core should poll the
HOM_P and HOM_R bits after requesting a mode change to determine if the
mode change is complete.
The mode status can be observed by the MPU core by reading the DSP Status
Register (DSP_STATUS_REG).
10 9
HOM_R
RW-0
SPRU890A
8
HOM_P
RW-0
0