Datasheet

153
SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
18.7.6.3 EBI Chip Select Assignment Register
Name: CCFG_EBICSA
Access: Read/Write
• 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 SDRAM 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 SmartMedia Logic is activated.
• EBI_CS4A: EBI Chip Select 4 Assignment
0: EBI Chip Select 4 is only assigned to the Static Memory Controller and EBI_NCS4 behaves as defined by the SMC.
1: EBI Chip Select 4 is assigned to the Static Memory Controller and the Compact Flash Logic Slot 0 is activated.
• EBI_CS5A: EBI Chip Select 5 Assignment
0: EBI Chip Select 5 is only assigned to the Static Memory Controller and EBI_NCS5 behaves as defined by the SMC.
1: EBI Chip Select 5 is assigned to the Static Memory Controller and the Compact Flash Logic Slot 1 is activated.
• EBI_DBPUC: EBI Data Bus Pull-up Configuration
0: EBI D0–D15 Data Bus bits are internally pulled-up to the VDDIOM1 power supply.
1: EBI D0–D15 Data Bus bits are not internally pulled-up.
• EBI_DRIVE: EBI I/O Drive Configuration
This allows to avoid overshoots and give the best performances according to the bus load and external memories.
31 30 29 28 27 26 25 24
––––––––
23 22 21 20 19 18 17 16
–––––DDR_DRIVEEBI_DRIVE
15 14 13 12 11 10 9 8
–––––––EBI_DBPUC
76543210
– – EBI_CS5A EBI_CS4A EBI_CS3A – EBI_CS1A –
Value Drive configuration Conditions
00 optimized for 1.8V powered memories with Low Drive Maximum load capacitance < 30 pF
01 optimized for 3.3V powered memories with Low Drive Maximum load capacitance < 30 pF
10 optimized for 1.8V powered memories with High Drive Maximum load capacitance < 55 pF
11 optimized for 3.3V powered memories with High Drive Maximum load capacitance < 55 pF