Freescale Semiconductor DSP56366 - Manual (Page 76)

Operating Mode Register (OMR)
DSP56366 24-Bit Digital Signal Processor User Manual, Rev. 4
4-2 Freescale Semiconductor
4.2.1 Asynchronous Bus Arbitration Enable (ABE) - Bit 13
The asynchronous bus arbitration mode is activated by setting the ABE bit in the OMR register. Hardware
reset clears the ABE bit.
4.2.2 Address Attribute Priority Disable (APD) - Bit 14
The Address Attribute Priority Disable (APD) bit is used to turn off the address attribute priority
mechanism. When this bit is set, more than one address attribute pin AA/RAS(2:0) may be simultaneously
asserted according to its AAR settings. The APD bit is cleared by hardware reset.
4.2.3 Address Tracing Enable (ATE) - Bit 15
The Address Tracing Enable (ATE) bit is used to turn on Address Tracing (AT) Mode. When the AT Mode
is enabled, the DSP56300 Core reflects the addresses of internal fetches and program space moves
(MOVEM) to the Address Bus (A0-A17), if the Address Bus is not needed by the DSP56300 Core for
external accesses. The ATE bit is cleared on hardware reset.
4.2.4 Patch Enable (PEN) - Bit 23
The Patch Enable function is used for patching Program ROM locations. i.e. to replace during program
execution, the contents of the Program ROM. This is done by using the Instruction Cache to supply the
instruction word instead of the Program ROM.
The Patch Enable function is activated by setting bit 23 (PEN) in the OMR Register. The PEN bit is cleared
by hardware reset.
Table 4-1 Operating Mode Register (OMR)
SCS EOM COM
23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
PEN MSW 1 : 0 SEN WRP EOV EUN XYS ATE APD ABE BRT TAS BE CDP1:0 MS SD EBD MD MC MB MA
PEN - Patch Enable ATE - Address Tracing Enable MS - Master memory Switch Mode
MSW1 - Memory switch mode 1 APD - Address Priority Disable SD - Stop Delay
MSW0 - Memory switch mode 0 ABE - Asyn. Bus Arbitration Enable
SEN - Stack Extension Enable BRT - Bus Release Timing EBD - External Bus Disable
WRP - Extended Stack Wrap Flag TAS - TA Synchronize Select MD - Operating Mode D
EOV - Extended Stack Overflow Flag BE - Burst Mode Enable MC - Operating Mode C
EUN - Extended Stack Underflow Flag CDP1 - Core-Dma Priority 1 MB - Operating Mode B
XYS - Stack Extension Space Select CDP0 - Core-Dma Priority 0 MA - Operating Mode A
- Reserved bit. Read as zero, should be written with zero for future compatibility