Single-Ended I/O Standards in Stratix II GX Devices
Stratix® II GX devices support a variety of single-ended I/O standards, including LVTTL, LVCMOS, SSTL, HSTL, PCI, and PCI-X standards, which allows Stratix II GX devices to easily interface with backplanes, host processors, buses, memory devices, and other board devices.
Single-ended systems provide more current drive capacity than differential I/O standards, and they are critical when working with advanced memory devices such as double data rate (DDR) SDRAM, DDR2 SDRAM, RLDRAM II, and quad data rate II (QDRII) SRAM devices.
Table 1 lists the single-ended I/O standards supported in Stratix II GX devices.
| Table 1. Stratix II GX Device Single-Ended I/O Standard Support |
| I/O Standard |
Performance Target |
Typical Application |
3.3-V/2.5-V LVTTL
1.8-V LVTTL |
300 MHz
250 MHz |
General Purpose
SDR SDRAM |
3.3-V/2.5-V LVCMOS
1.8-V LVCMOS
1.5-V LVCMOS |
300 MHz
250 MHz
200 MHz |
General Purpose |
| SSTL-2 Class I & II |
200 MHz |
DDR SDRAM,
RLDRAM II |
| SSTL-18 Class I & II |
267 MHz |
DDR2 SDRAM |
| 1.8-V HSTL Class I & II |
300 MHz |
QDRII SRAM,
RLDRAM II |
| 1.5-V HSTL Class I & II |
250 MHz |
Memory & Switch Fabric |
| 3.3-V PCI |
66 MHz |
PC & Embedded |
| 3.3-V PCI-X |
133 MHz |
PC & Embedded |
| Differential SSTL-2 Class I & II |
200 MHz |
Memory & Switch Fabric |
| Differential SSTL-18 Class I & II |
267 MHz |
DDR2 SDRAM |
| Differential 1.8-V HSTL Class I & II |
300 MHz |
QDRII SRAM,
RLDRAM II |
| Differential 1.5-V HSTL Class I & II |
250 MHz |
Memory & Switch Fabric |
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