ADM-XRC SDK 2.8.1 User Guide (Linux)
© Copyright 2001-2009 Alpha Data


Introduction to the local bus

This section provides a brief primer to the protocol used on the local bus common to the Alpha Data Xilinx Reconfigurable Coprocessor range. The key features of the local bus are:

The differences between the models in the ADM-XRC range can be summarized by the following table:

Feature ADM-XRC
ADM-XRC-P
ADM-XRC-II-Lite ADM-XRC-II
FPGA technology Virtex
Virtex-E
Virtex-EM
Virtex-II Virtex-II
Memory technology ZBT SSRAM ZBT SSRAM ZBT SSRAM
Max. local bus frequency 40.0MHz 40.0MHz 66.67MHz
Multiplexed address/data on local bus No No No
Supported data widths on local bus 32 bits 32 bits 32 bits
PCI to local bus bridge PCI9080 PCI9080 PCI9656

Feature ADP-DRC-II ADP-WRC-II ADM-XPL
FPGA technology Virtex-II Virtex-II Virtex-II Pro
Memory technology DDR SDRAM DIMM
DDR-II SSRAM
DDR SDRAM DDR SDRAM
ZBT SSRAM
Max. local bus frequency 66.67MHz 66.67MHz 80.0MHz
(see note 1 below)
Multiplexed address/data on local bus No No Yes
Supported data widths on local bus 32 bits 32 bits 32 bits
64 bits
PCI to local bus bridge PCI9656 PCI9656 Virtex-II

Feature ADM-XP ADP-XPI ADM-XRC-4LX
FPGA technology Virtex-II Pro Virtex-II Pro Virtex-4 LX
Memory technology DDR SDRAM
DDR-II SSRAM
DDR SDRAM DIMM
DDR-II SSRAM
ZBT SSRAM
Max. local bus frequency 80.0MHz 80.0MHz 66.67MHz
Multiplexed address/data on local bus Yes Yes No
Supported data widths on local bus 32 bits
64 bits
32 bits
64 bits
32 bits
PCI to local bus bridge Virtex-II Virtex-II PCI9656

Feature ADM-XRC-4SX ADM-XRC-4FX ADPE-XRC-4FX
FPGA technology Virtex-4 SX Virtex-4 FX Virtex-4 FX
Memory technology ZBT SSRAM DDR-II SDRAM DDR-II SDRAM
Max. local bus frequency 66.67MHz 80.0MHz 80.0MHz
Multiplexed address/data on local bus No Yes Yes
Supported data widths on local bus 32 bits 32 bits
64 bits
32 bits
64 bits
PCI to local bus bridge PCI9656 Virtex-4 LX Virtex-4 FX
(PCI Express)

Feature ADM-XRC-5LX ADM-XRC-5T1 ADM-XRC-5T2
FPGA technology Virtex-5 LX Virtex-5 LXT
Virtex-5 SXT
Virtex-5 FXT
Virtex-5 LXT
Virtex-5 SXT
Memory technology DDR-II SDRAM DDR-II SDRAM
DDR-II SSRAM
DDR-II SDRAM
DDR-II SSRAM
Max. local bus frequency 80.0MHz 80.0MHz 80.0MHz
Multiplexed address/data on local bus Yes Yes Yes
Supported data widths on local bus 32 bits
64 bits
32 bits
64 bits
32 bits
64 bits
PCI to local bus bridge Virtex-4 LX Virtex-4 LX Virtex-4 LX

Note 1: If logic revision from INFO utility is 1.2 or greater, max. LCLK frequency is 80MHz; otherwise 66.67MHz.

Click on one of the following topics for more information:

Local bus signals

Direct slave transfers

DMA transfers

Arbitration

Direct master transfers

Tips on local bus interface design

 


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