EP3C16F256I7 Altera, EP3C16F256I7 Datasheet - Page 218

• Manufacturer Part Number: EP3C16F256I7
• Description: Cyclone III
• Manufacturer: Altera

External Memory Interfaces in Cyclone III Devices
9–4
Cyclone III Device Handbook, Volume 1
Notes to
(1)
(2)
(3)
(4)
DDR
SDRAM
(2)
QDRII
SRAM
Table 9–3. Cyclone III Maximum Clock Rate Support for External Memory Interfaces
Standard
Memory
These numbers are preliminary until characterization is final.
The values apply for interfaces with both modules and components.
Support will be evaluated after characterization.
QDRII SRAM also supports the 1.5-V HSTL I/O standard. However, Altera recommends using the 1.8-V HSTL
I/O standard for maximum performance because of the higher I/O drive strength.
(4)
Table
HSTL class
1.8V HSTL
Standard
SSTL-2
SSTL-2
class II
class II
9–3:
class I
1.8-V
I/O
I
Top/Bottom
I/O Banks
-6 Speed Grade (MHz)
167
133
167
100
Left/Right
I/O Banks
150
125
150
(3)
Top/Bottom
I/O Banks
-7 Speed Grade (MHz)
150
125
150
(3)
Commercial
Left/Right
I/O Banks
133
100
133
(3)
Altera Corporation-Preliminary
Top/Bottom
I/O Banks
-8 Speed Grade (MHz)
Note (1)
133
100
133
(3)
(Part 2 of 2)
March 2007
Left/Right
I/O Banks
125
125
(3)
(3)