Texas Instruments TMS320 2833 Series

XINTF_Parallel_Boot
InitializeGPIOMUX
forx16XINTF
onzone6
GPIO13=input
GPIO12=output
Configuredefault
timingforXINTF
zone6
Readkeyvalueto
determineDataSize
andassignappropriate
GetWordDatafunction
Valid
KeyValue
(0x08AA or
0x10AA)
?
No
Yes
EnableWatchdog
andforcereset
ReadPLLCRand
DIVSEL values
ReadXINTFzone6
timingvalues
ConfigurePLL
ConfigureXINTF
Readremaining
reservedwords
ReadEntryPoint
address
Call
CopyData
ReturnEntryPoint
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200
SPRUI07–March 2020
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Boot ROM
Figure 2-26. XINTF Parallel Mode Overview
Figure 2-27 shows the transfer flow from the host side. The operating speed of the CPU and host are not
critical in this mode as the host will wait for the 28x and the 28x will in turn wait for the host. In this manner
the protocol will work with both a host running faster and a host running slower then the 28x device.