wiki:Component/VciSimpleRom

SocLib Components General Index

VciSimpleRom

1) Functional Description

This VCI target is a multi-segments ROM controller.

The VCI DATA width must be 32 or 64 bits. The VCI ADDRESS and the PLEN field must be multiple of 4 bytes.

This component handles one or several independent memory segments. Each segment is defined by a base address and a size (number of bytes).

A READ burst command packet (such a cache line request) contains one single flit. The number of flits in the response packet depends on the PLEN field:

  • If VCI DATA width = 32 bits, each flit contains 4 bytes, and the number of flits is PLEN/4.
  • If VCI DATA width = 64 bits, and PLEN define an even number of words, each flit contains 8 bytes, and the number of flits is PLEN/8.
  • If VCI DATA width = 64 bits, and PLEN define an odd number of words, the last flit contains only 4 bytes (right justified), and the number of flits is PLEN/8 + 1.

The binary code contained in the ROM can be loaded from an ELF binary file by the Loader defined as a constructor argument.

2) Component definition & usage

source:trunk/soclib/soclib/module/internal_component/vci_simple_rom/caba/metadata/vci_simple_rom.sd

Uses( 'vci_simple_ram' )

3) CABA Implementation

CABA sources

CABA Constructor parameters

VciSimpleRom(
     sc_module_name name,                     // Instance name
     const soclib::common::IntTab &index,     // Target index
     const soclib::common::MappingTable &mt,  // Mapping Table
     soclib::common::Loader &loader);         // Loader

CABA Ports

  • p_resetn : hardware reset
  • p_clk : clock
  • p_vci : The VCI port
Last modified 8 years ago Last modified on Nov 19, 2014, 3:22:06 PM