Single-Ended I/O Standards in Stratix GX Devices
Stratix™ GX devices support a variety of single-ended I/O standards, and easily interface with host processors, buses, memory devices, and 3D graphics controllers. 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 and zero-bus turnaround (ZBT) SRAM devices. Table 1 lists the different single-ended I/O standards that are supported in Stratix GX devices as well as their typical applications.
| Table 1. Stratix GX Device Single-Ended I/O Standard Support |
| I/O Standard |
Performance Target |
Typical Application |
| 3.3-V/2.5-V/1.8-V LVTTL |
250 MHz |
General-purpose, ZBT SRAM |
| 3.3-V/2.5-V/1.8-V/1.5-V LVCMOS |
250 MHz |
General-purpose |
| 3.3-V/2.5-V GTL |
100 MHz |
Backplane |
| 3.3-V/2.5-V GTL+ |
200 MHz |
Backplane |
| SSTL-3 Class I & II |
166 MHz |
SDRAM |
| SSTL-2 Class I & II |
200 MHz |
DDR SDRAM |
| 1.5-V HSTL I & II |
250 MHz |
Memory & switch fabric |
| 3.3-V PCI |
66 MHz |
PC & embedded |
| 3.3-V PCI-X |
133 MHz |
PC & embedded |
| Compact PCI |
60 MHz |
PC & embedded |
| 3.3-V/1.5-V 1x AGP |
60 MHz |
3-D graphics |
| 3.3-V/1.5-V 2x AGP |
133 MHz |
3-D graphics |
| CTT |
250 MHz |
Backplane |
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