SAM3A8C Atmel Corporation, SAM3A8C Datasheet - Page 1155
SAM3A8C
Manufacturer Part Number
SAM3A8C
Description
Manufacturer
Atmel Corporation
- Current page: 1155 of 1465
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39.6.2.18
Name:
Address:
Access:
• BUFF_ADD: Buffer Address
This field determines the AHB bus starting address of a DMA channel transfer.
Channel start and end addresses may be aligned on any byte boundary.
The firmware may write this field only when the UOTGHS_DEVDMASTATUS.CHANN_ENB bit is clear.
This field is updated at the end of the address phase of the current access to the AHB bus. It is incrementing of the access
byte width. The access width is 4 bytes (or less) at packet start or end, if the start or end address is not aligned on a word
boundary.
The packet start address is either the channel start address or the next channel address to be accessed in the channel
buffer.
The packet end address is either the channel end address or the latest channel address accessed in the channel buffer.
The channel start address is written by software or loaded from the descriptor, whereas the channel end address is either
d e t e r m i n e d
UOTGHS_DEVDMACONTROLx.END_TR_EN bit is set.
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
31
23
15
7
Device DMA Channel x Address Register
UOTGHS_DEVDMAADDRESSx [x=1..7]
0x400AC314 [1], 0x400AC324 [2], 0x400AC334 [3], 0x400AC344 [4], 0x400AC354 [5], 0x400AC364 [6],
0x400AC374 [7]
Read-write
b y
30
22
14
t h e
6
e n d
o f
29
21
13
5
b u f f e r
o r
28
20
12
4
BUFF_ADD
BUFF_ADD
BUFF_ADD
BUFF_ADD
t h e
U S B
27
19
11
3
d e v i c e ,
U S B
26
18
10
2
e n d
o f
25
17
9
1
t r a n s f e r
SAM3X/A
SAM3X/A
24
16
8
0
i f
1155
1155
t h e
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