Bootloader Features
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SPRUI07–March 2020
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Boot ROM
Table 2-5. LSB/MSB Loading Sequence in 8-bit Data Stream (continued)
Byte
Contents
LSB (First Byte of 2) MSB (Second Byte of 2)
. . LSB: MSW destination address, second block Addr[23:16] MSB: MSW destination address, second block
Addr[31:24]
. . LSB: LSW destination address, second block Addr[7:0] MSB: LSW destination address, second block Addr[15:8]
. . LSB: First word of the second block being loaded MSB: First word of the second block being loaded
...
...
...
...
...
...
...
...
. . LSB: Last word of the second block MSB: Last word of the second block
. . LSB: Block size of the last block MSB: Block size of the last block
. . LSB: MSW of destination address of last block
Addr[23:16]
MSB: MSW destination address, last block Addr[31:24]
. . LSB: LSW destination address, last block Addr[7:0] MSB: LSW destination address, last block Addr[15:8]
. . LSB: First word of the last block being loaded MSB: First word of the last block being loaded
...
...
...
...
...
...
...
...
. . LSB: Last word of the last block MSB: Last word of the last block
n n+1 LSB: 00h MSB: 00h - indicates the end of the source
Example 2-4. Data Stream Structure 8-bit
AA 08 ; 0x08AA 8-bit key value
00 00 00 00 ; 8 reserved words
00 00 00 00
00 00 00 00
00 00 00 00
3F 00 00 80 ; 0x003F8000 EntryAddr, starting point after boot load completes
05 00 ; 0x0005 - First block consists of 5 16-bit words
3F 00 10 90 ; 0x003F9010 - First block will be loaded starting at 0x3F9010
01 00 ; Data loaded = 0x0001 0x0002 0x0003 0x0004 0x0005
02 00
03 00
04 00
05 00
02 00 ; 0x0002 - 2nd block consists of 2 16-bit words
3F 00 00 80 ; 0x003F8000 - 2nd block will be loaded starting at 0x3F8000
00 77 ; Data loaded = 0x7700 0x7625
25 76
00 00 ; 0x0000 - Size of 0 indicates end of data stream
After load has completed the following memory values will have been initialized as follows:
Location Value
0x3F9010 0x0001
0x3F9011 0x0002
0x3F9012 0x0003
0x3F9013 0x0004
0x3F9014 0x0005
0x3F8000 0x7700
0x3F8001 0x7625
PC Begins execution at 0x3F8000
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