8-Bit Parallel Getword Function - Texas Instruments Concerto F28M36 Series Technical Reference Manual

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Signal host that device is ready
Device ack read complete
The below function call sequence gives details of the flow when Parallel boot mode is selected on the
device.
• ResetIsr()
• mbrom_init_device()
• mbrom_master_system_init ()
• mbrom_control_system_init()
• mbrom_analog_system_init()
• M-Boot ROM WIR Mode Check – Please refer to WIR Mode section in the System Control and
Interrupts chapter.
• mbrom_get_bootmode()
– o Parallel_Boot();
• mbrom_start_app(M_BOOT_ROM_PARALLEL_BOOT_MODE_ENTRY_POINT)
SPRUHE8E – October 2012 – Revised November 2019
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Figure 6-9. 8-Bit Parallel GetWord Function
Parallel_GetWordData
8 bit
(GPIO26 = 0)
Data
No
ready
(GPIO27 = 0)
?
Yes
Read word of data
from GPIO[9,8,5:0]
(GPIO26 = 1)
Host
No
ack
(GPIO27 = 1)
?
Yes
A
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A
Signal host that device
is ready to read MSB
(GPIO26 = 0)
Data
No
ready
(GPIO27 = 0)
?
Yes
Read GPIO [15:0] with
GPIO[9:8] masked into
GPIO[7:6] for LSB of data.
Discard GPIO[15:8].
Repeat for MSB of data.
Device ack read complete
(GPIO26 = 1)
Host
ack No
(GPIO27 = 1)
?
Yes
WordData = MSB:LSB
Return WordData
ROM Code and Peripheral Booting
M-Boot ROM Description
611