Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Fiche De Données
Codes de produits
ATSAM4E-XPRO
1227
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
43.7.5 DMA Configuration Register
Name:
GMAC_DCFGR
Address:
0x40034010
Access: Read/Write
FBLDO: Fixed Burst Length for DMA Data Operations:
Selects the burst length to attempt to use on the AHB when transferring frame data. Not used for DMA management oper-
ations and only used where space and data size allow. Otherwise SINGLE type AHB transfers are used.
ations and only used where space and data size allow. Otherwise SINGLE type AHB transfers are used.
Upper bits become non-writable if the configured DMA TX and RX FIFO sizes are smaller than required to support the
selected burst size.
selected burst size.
One-hot priority encoding enforced automatically on register writes as follows, where ‘x’ represents don’t care:
ESMA: Endian Swap Mode Enable for Management Descriptor Accesses
When set, selects swapped endianism for AHB transfers. When clear, selects little endian mode.
ESPA: Endian Swap Mode Enable for Packet Data Accesses
When set, selects swapped endianism for AHB transfers. When clear, selects little endian mode.
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
DRBS
15
14
13
12
11
10
9
8
–
–
–
–
–
–
–
–
7
6
5
4
3
2
1
0
ESPA
ESMA
–
FBLDO
Value
Name
Description
0
–
Reserved
1
SINGLE
00001: Always use SINGLE AHB bursts
2
–
Reserved
4
INCR4
001xx: Attempt to use INCR4 AHB bursts (Default)
8
INCR8
01xxx: Attempt to use INCR8 AHB bursts
16
INCR16
1xxxx: Attempt to use INCR16 AHB bursts