Texas Instruments TMS320*2801 Series

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(GPIO26 = 0)
Signal host that DSP is ready
Parallel_GetWordData
8 bit
(GPIO27 = 0)
?
Data
ready
Yes
from GPIO 15:0
Read word of data
(GPIO26 = 1)
DSP ack read complete
(GPIO27 = 1)
ack
Host
No
?
A
ack
Host
(GPIO27 = 1)
DSP ack read complete
(GPIO26 = 1)
?
ready
Data
(GPIO27 = 0)
Signal host that DSP
(GPIO26 = 0)
is ready to read MSB
?
A
Read word from
GPIO[15:0], discard
the upper 8 bits, MSB
of data = lower 8 bits
Return WordData
WordData = MSB:LSB
No
No
No
Yes
Yes
Yes
Parallel_Boot Function (GPIO)
Figure 2-18. 8-Bit Parallel GetWord Function
SPRU722C – November 2004 – Revised October 2006 Bootloader Features 39
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