参数资料
型号: EP2C20F256I6N
厂商: ALTERA CORP
元件分类: FPGA
英文描述: FPGA, 1196 CLBS, PBGA256
封装: LEAD FREE, FBGA-256
文件页数: 122/168页
文件大小: 2206K
代理商: EP2C20F256I6N
Altera Corporation
2–45
February 2007
Cyclone II Device Handbook, Volume 1
Cyclone II Architecture
In Cyclone II devices, all the I/O banks support SDR and DDR SDRAM
memory up to 167 MHz/333 Mbps. All I/O banks support DQS signals
with the DQ bus modes of ×8/×9, or ×16/×18. Table 2–14 shows the
external memory interfaces supported in Cyclone II devices.
Cyclone II devices use data (DQ), data strobe (DQS), and clock pins to
interface with external memory. Figure 2–26 shows the DQ and DQS pins
in the ×8/×9 mode.
Table 2–14. External Memory Support in Cyclone II Devices
Memory Standard
I/O Standard
Maximum Bus
Width
Maximum Clock
Rate Supported
(MHz)
Maximum Data
Rate Supported
(Mbps)
SDR SDRAM
LVTTL (2)
72
167
DDR SDRAM
SSTL-2 class I (2)
72
167
333 (1)
SSTL-2 class II (2)
72
133
267 (1)
DDR2 SDRAM
SSTL-18 class I (2)
72
167
333 (1)
SSTL-18 class II (3)
72
125
250 (1)
QDRII SRAM (4)
1.8-V HSTL class I
36
167
668 (1)
1.8-V HSTL class II
36
100
400 (1)
Notes to Table 2–14:
(1)
The data rate is for designs using the Clock Delay Control circuitry.
(2)
The I/O standards are supported on all the I/O banks of the Cyclone II device.
(3)
The I/O standards are supported only on the I/O banks on the top and bottom of the Cyclone II device.
(4)
For maximum performance, Altera recommends using the 1.8-V HSTL I/O standard because of higher I/O drive
strength. QDRII SRAM devices also support the 1.5-V HSTL I/O standard.
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