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7.8.3
Burst Read
A burst read occurs in the following cases in this LSI.
•
16-byte transfer in cache miss.
•
16-byte transfer in DMAC (access to non-cacheable region)
•
Access size in reading is larger than data bus width.
This LSI always accesses the SDRAM with burst length 1. For example, read access of burst
length 1 is performed consecutively 4 times to read 16-byte continuous data from the SDRAM that
is connected to a 32-bit data bus.
Table 7.16 shows the relationship between the access size and the number of bursts.
Table 7.16
Relationship between Access Size and Number of Bursts
Bus Width
Access Size
Number of Bursts
8 bits
1
16 bits
1
32 bits
2
16 bits
16 bits
8
8 bits
1
16 bits
1
32 bits
1
32 bits
16 bits
4
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