EP420 64-bit PCI Host Bridge

See EP430 for 32-bit PCI Host Bridge

Features

• Fully supports PCI specification 2.1 and 2.2 protocol.
• Designed for ASIC and PLD implementations.
• Supports both 64-bit and 32-bit bus systems.
• Fully static design with edge triggered flip-flops.
• Efficient back-end interface for different types of user devices.
• Host bridge design includes bus master, bus target and central system functions.
• Generates standard PCI type 0 and type 1 configuration accesses.
• Combined bus master and target functions.
  • Master function
  • Initiate PCI memory and IO read/write.
  • Automatic transfer restart on target retry and disconnect
  • Target function
  • Memory or IO read/write
  • Configuration read/write
  • Support for back-end initiated target retry, disconnect and abort.
• Supports Zero wait state and user inserted wait state burst data transfer.
• Dual write buffer supports write data posting.
• User controlled burst and non-burst data transfer.
• Automatic handling of configuration register read/write access.
• Supports user initiated target retry, disconnect, abort and delayed transaction.
• Parity generation and parity error detection.
• Includes all PCI specific configuration registers.
• Supports high speed bus request and bus parking.
• Optional PCI bus arbiter with fix, rotating, and custom priority.

Differentiating Features

• Backend interface bus type and width selection.
• Bus arbiter with priority selection.
• Multiple base address registers.
• Asynchronous clock domain.
• Address/Data multiplexing.
• Backend FIFO interface.
• Unidirectional host bridge.
• Burst length and target burst.

Diagram