Datasheet

319
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
25.7.6 EBI Chip Select Assignment Register
Name: CCFG_EBICSA
Address: 0xFFFFDF20
Access: Read/Write
Reset: 0x00000200
• EBI_CS1A: EBI Chip Select 1 Assignment
0: EBI Chip Select 1 is assigned to the Static Memory Controller.
1: EBI Chip Select 1 is assigned to the DDR2SDR Controller.
• EBI_CS3A: EBI Chip Select 3 Assignment
0: EBI Chip Select 3 is only assigned to the Static Memory Controller and EBI_NCS3 behaves as defined by the SMC.
1: EBI Chip Select 3 is assigned to the Static Memory Controller and the NAND Flash Logic is activated.
• EBI_DBPUC: EBI Data Bus Pull-Up Configuration
0: EBI D0–D15 Data Bus bits are internally pulled-up to the VDDIOM power supply.
1: EBI D0–D15 Data Bus bits are not internally pulled-up.
• EBI_DBPDC: EBI Data Bus Pull-Down Configuration
0: EBI D0–D15 Data Bus bits are internally pulled-down to the ground.
1: EBI D0–D15 Data Bus bits are not internally pulled-down.
• EBI_DRIVE: EBI I/O Drive Configuration
This allows to avoid overshoots and gives the best performance according to the bus load and external memories.
0: Low drive (default).
1: High drive.
31 30 29 28 27 26 25 24
––––––DDR_MP_EN NFD0_ON_D16
23 22 21 20 19 18 17 16
––––––EBI_DRIVE–
15 14 13 12 11 10 9 8
––––––EBI_DBPDCEBI_DBPUC
7654321 0
– – – – EBI_CS3A – EBI_CS1A –