EP2S180F1020C4 Datasheet, PDF (457/768 Pages) Altera Corporation – Stratix II Device Handbook, Volume 1

Selectable I/O Standards in Stratix II and Stratix II GX Devices
HyperTransport Technology
The HyperTransport standard is formulated by the HyperTransport
Consortium.
The HyperTransport I/O standard is a differential high-speed,
high-performance I/O interface standard requiring a 2.5- or 3.3-V V_CCIO.
This standard is used in applications such as high-performance
networking, telecommunications, embedded systems, consumer
electronics, and Internet connectivity devices. The HyperTransport I/O
standard is a point-to-point standard in which each HyperTransport bus
consists of two point-to-point unidirectional links. Each link is 2 to 32 bits.
The HyperTransport standard does not require an input reference
voltage. However, it does require a 100- termination resistor between
the two signals at the input buffer. Figure 4–20 shows HyperTransport
termination. Stratix II and Stratix II GX devices include an optional 100-
differential HyperTransport termination resistor in the device using
on-chip differential termination.
1 Stratix II and Stratix II GX devices support both input and
output levels operation.
Figure 4–20. HyperTransport Termination
Output Buffer
Z = 50 Ω
Input Buffer
100 Ω
Z = 50 Ω
Stratix II and
Stratix II GX
External
Memory
Interface
The increasing demand for higher-performance data processing systems
often requires memory-intensive applications. Stratix II and Stratix II GX
devices can interface with many types of external memory.
f
Refer to the External Memory Interfaces in Stratix II & Stratix II GX Devices
chapter in volume 2 of the Stratix II Device Handbook or the External
Memory Interfaces in Stratix II & Stratix II GX Devices chapter in volume 2
of the Stratix II GX Device Handbook for more information on the external
memory interface support in Stratix II or Stratix II GX devices.
Altera Corporation
January 2008
4–19
Stratix II Device Handbook, Volume 2