Diodes Incorporated
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PI7C8154B (Obsolete)

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Product Description

The PI7C8154B is a PCI-to-PCI Bridge, designed to be fully compliant with the 64-bit, 66MHz implementation of the PCI Local Bus Specification, Revision 2.2. The PI7C8154B supports synchronous and asynchronous bus transactions between devices on the Primary Bus and the Secondary Buses operating up to 66MHz. For the PI7C8154B-80, the Secondary Bus supports up to 80MHz operation. The primary and secondary buses can also operate in concurrent mode, resulting in added increase in system performance.


  • 64-bit Primary and Secondary Ports run up to 66MHz
  • Compliant with the PCI Local Bus Specification, Revision 2.2
  • Compliant with PCI-to-PCI Bridge Architecture Specification, Revision 1.1
    • All I/O and memory commands
    • Type 1 to Type 0 configuration conversion
    • Type 1 to Type 1 configuration forwarding
    • Type 1 configuration write to special cycle conversion
  • Compliant with the PCI Power Management Specification, Revision 1.1
  • Synchronous and Asynchronous operation support
    • Supported modes of asynchronous operation
      Primary (MHz)Secondary (MHz)
      25MHz to 66MHz 25MHz to 66MHz*
      *up to 80MHz on the PI7C8154B-80 only
  • Provides internal arbitration for four secondary bus masters 
    • Programmable 2-level priority arbiter 
  • Supports serial EEPROM interface for register auto-load and VPD access
  • Dynamic Prefetching Control
  • Supports posted write buffers in all directions
  • 512 byte upstream posted memory write
  • 512 byte downstream posted memory write
  • 1024 byte upstream read data buffer
  • 1024 byte downstream read data buffer
  • Enhanced address decoding
  • 32-bit I/O address range
  • 32-bit memory-mapped I/O address range
  • 64-bit prefetchable address range
  • IEEE 1149.1 JTAG interface support
  • Extended commercial and Industrial temperature range
    • Extended commercial: 0°C to 85°C
    • Industrial: -40°C to 85°C
  • 3.3V and 5V signaling
  • 304-pin PBGA package 
    • Pb-free & Green available 

Product Specifications

Product Parameters

Lanes N/A
PCI Bus Width 64
PCI Speed 66
Ports 2
Ambient or Junction Temperature (°C) -40 to 85

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