tmpr4937 TOSHIBA Semiconductor CORPORATION, tmpr4937 Datasheet - Page 167
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tmpr4937
Manufacturer Part Number
tmpr4937
Description
64-bit Tx System Risc
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMPR4937.pdf
(552 pages)
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8.3.7.2
a0
a8
b0
b8
c0
c8
d0
d8
e0
e8
00
08
10
18
20
28
30
38
40
48
50
58
60
f0
f8
(a) DMCCRn.USEXFSZ = “0”
63
Burst Transfer During Single Address Transfer
Controller cannot perform Burst transfer that spans across 32-double word boundaries.
Consequently, if the address that starts DMA transfer is not a multiple of the transfer setting size
(DMCCRn.XFSZ) (is not aligned), transfer cannot be performed by any of the transfer sizes that
were specified by a Burst transfer. Therefore, the DMA Controller executes multiple Burst
transactions of a transfer size smaller than the specified transfer size. This division method
changes according to the seting of the Transfer Size Mode bit (DMCCRn.USEXFSZ) of the DMA
Channel Control Register.
Transfer Start address are 0xA8 and the transfer setting size (DMCCRn.XFSZ) is set to 4 double
words.
(DMCCRn.USEXFSZ) is “0”. In this case, first a three-double word transfer is performed up to
the address aligned to the transfer setting size. Then, four-double word transfer specified by the
transfer setting size is repeated. This setting is normally used.
is “1”. In this case, transfer is repeated according to the transfer setting size. Three-double word
transfer and one-double word transfer is only performed consecutively without releasing bus
ownership when transfer spans across a 32-double word boundary.
According to the SDRAM Controller and External Bus Controller specifications, the DMA
Figure 8.3.2 shows the Single Address Burst transfer status when the lower 8 bits of the
Panel (a) of this figure shows the situation when the Transfer Size Mode bit
On the other hand, panel (b) shows when the Transfer Size Mode bit (DMCCRn.USEXFSWZ)
Figure 8.3.2 Non-aligned Single Address Burst Transfer
0
3 Double Words
4 Double Words
4 Double Words
4 Double Words
4 Double Words
4 Double Words
DMCCRn.XFER = 4
32 Double Word Boundary
8-11
(b) DMCCRn.USEXFSZ = “1”
a0
a8
b0
b8
d0
d8
e0
e8
00
08
10
18
20
28
30
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50
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Chapter 8 DMA Controller
c0
c8
f0
f8
63
0
4 Double Words
4 Double Words
(3 + 1) Double Words
4 Double Words
4 Double Words
4 Double Words
DMCCRn.XFER = 4
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