Motorola DSP56301 - Manual (Page 190)

Host-Side Programming Model
6 -72 DSP56301 User’s Manual
Use the following procedure for writing to the CSID:
1. Power up the DSP56301.
The default CSID value is $00000000. The HI32 is in the Personal Software Reset
state (HM = $0) and responds to memory and configuration space PCI transactions
with a retry event.
2. Boot the DSP56301through the EPROM or SCI.
a. The program downloaded to the DSP56301 should do the following:
— Enter the Self-Configuration mode (HM = $5) and write the CSID. The HI32
still responds to memory and configuration space PCI transactions with a retry
event.
— Optional: set the PCTL value.
This enables the DSP56301 to run from the low-frequency internal clock.
— Enter the Personal Software Reset state (HM = $0).
— Enter PCI mode (HM = $1).
Now a PCI master can access the DSP56301 PCI configuration space.
— Optional: Set the mode bits in the OMR to MC:MB:MA = 100 and jump to the
DSP56301 bootstrap ROM start address $FF0000 for further program download
from the HI32 in the PCI mode.
Example 6-5. Code for Setting the CSID
move#0, x0 ; set constant
movep #>$500000, x:M_DCTR ; Set Self-Configuration mode
rep #4
movep X0, x:M_DPAR ; set register pointer to SIDR/DVID
movep #>$012345, x:M_DPMC ; set SIDR value to $2345
movep #>$6789ab, x:M_DPAR ; set SVID value to $89ab and write SIDR/SVID
movep x0, x:M_DCTR ; personal software reset
movep #$100000, x:M_DCTR ; set PCI mode
Note: Also see Example 6-3 on page 6-17.