Datasheet

293
SAM9G15 [DATASHEET]
11052D–ATARM–31-Oct-12
25.7.6.1 EBI Chip Select Assignment Register
Name: CCFG_EBICSA
Access: Read-write
Reset: 0x0000_0000
• 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.
• NFD0_ON_D16: NAND Flash Databus Selection
0 = NAND Flash I/Os are connected to D0-D15. VDDNF must be equal to VDDIOM (default).
1 = NAND Flash I/Os are connected to D16-D31. VDDNF can be different from or equal to VDDIOM.
This can be used if the SMC connects to the NAND Flash only. Using this function with another device on the SMC will lead to an
unpredictable behavior of that device. In that case, the default value must be selected.
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_DBPDC EBI_DBPUC
7654321 0
– – – – EBI_CS3A – EBI_CS1A –