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EHB (Embedded Host Bridges)

Host Bridges (EHB) by IDT play a critical system role acting as a hub between the host processor, the system memory, and the system input/output (I/O). The host processor and the system I/O both use the host bridge to access common system memory. In addition, the system controller and host processor use the host bridge to configure and manage system I/O.

IDT offers host bridges that service high-end discrete processors as well as bridges that are optimized for embedded integrated controllers.

Technical inquiries or support questions can be submitted via the technical support form.

Download the Switching and Bridging Solutions Overview (PDF)
► Download the Military-Aerospace Products Overview (PDF)

PowerSpan II

The PowerSpan II is a multi-port PCI bus switch that bridges PCI to the PowerQUICC™ II (MPC8260), MPC7xx, PowerPC® 7xx, and PMC-Sierra WinPath™ processors. The bridge defines a new level of PCI bus switch flexibility.

The PowerSpan II has a switched PCI architecture, which maximizes transfer concurrency and improves the efficiency and burst performance on the PCI and processor buses. Along with a revolutionary switched PCI architecture, the PowerSpan II features integrated PCI-to-PCI bridging, concurrent prefetch read capability, multi-port Direct Memory Access (DMA) operation, and CompactPCI Hot Swap support.The PowerSpan II is available in single or dual PCI variants. The single PCI PowerSpan II is a two-port device that has a PCI interface and a PowerPC bus interface. The dual PCI variant is a three-port device that has two PCI interfaces and a PowerPC bus interface.

The PowerSpan II in conjunction with the PowerPro – a PowerPC memory controller – provides a 100-MHz PowerPC interconnect solution. This flexible offering allows designers to leverage the PowerSpan II and PowerPro devices across many different system architectures with a common investment in software.

QSpan II

The QSpan II is an industry-proven, Freescale™ Semiconductor processor-to-PCI system interconnect device. The QSpan II enables board designers to bring PCI-based embedded products to market faster, for less cost, and with high performance.

The QSpan II is designed to gluelessly bridge the Freescale PowerQUICC™ and QUICC™ (MC68360) processors to the PCI bus. The QSpan II is backward compatible with the QSpan 1.2.


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PCI BusProcessor BusMemory InterfaceTemp. RangePower Consumption Max (W)Pkg. CodePkg. Dimensions
PowerSpan II User ManualCA91L8260B - Block DiagramCA91L8260B
PowerPC to PCI Bus Switch
66MHz/64 bit PCIPowerQUICC II (MPC82xx)-100MHz0 to 70°C1.9AE420, AEG42035 x 35 x 2.33
QSpan II User ManualCA91L862A - Block DiagramCA91L862A
PowerQUICC to PCI Bridge
33MHz/32-bit PCIPowerQUICC (MPC8xx) -50MHz-40 to 85°C0.9AM256, AMG256, BG256, BGG25617 x 17 x 1.61, 27 x 27 x 2
Tsi108/Tsi109 User ManualTsi108 - Block DiagramTSI108
Host Bridge
133MHz/64-bit PCI-XPowerPC 7xx/7448 -200MHzDDR2-4000 to 70°C3.7RM102333 x 33 x 2
Tsi108/Tsi109 User ManualTsi109 - Block DiagramTSI109
Host Bridge
133MHz/64-bit PCI-XPowerPC 7xx/7448 -200MHzDDR2-400-40 to 85°C, 0 to 70°C3.7HM1023, RM102333 x 33 x 2
Tsi110 User ManualTsi110 - Block DiagramTSI110
Host Bridge
133MHz/64-bit PCI-XPowerPC 7xx/7448 -167MHzDDR2-333 MHz0 to 70°C2.27RM102333 x 33 x 2