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M-Boot ROM Description
Load GPIO[9,8,5:0] with data
Figure 6-9
shows the flow used to read a single word of data from the parallel port.
•
8-bit data stream
The 8-bit routine, shown in
fetched. The routine will then perform a second read to fetch the most significant byte (MSB). It then
combines the MSB and LSB into a single 16-bit value to be passed back to the calling routine.
610
ROM Code and Peripheral Booting
Figure 6-8. Parallel GPIO Mode - Host Transfer Flow
Start transfer
No
Device ready
(GPIO26=0)
?
Yes
Signal that data
is ready
(AIO12=0)
Figure
6-9, shows how the least significant byte (LSB) of the word is to be
Copyright © 2012–2019, Texas Instruments Incorporated
No
Device ack
(GPIO26=1)
?
Yes
Acknowledge device
(GPIO27=1)
More
Yes
data
?
No
End transfer
SPRUHE8E – October 2012 – Revised November 2019
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