SocLib Components General Index

Demapping

1) Functional Description

The demapping operation consists in demodulating the inputs symbols into bits. In our system, the used demapping is a QPSK (Quadrature Phase-Shift Keying) demodulation. The architecture of the demapping component is presented in the figure 1. It is composed of a demapping core and a MWMR wrapper. The wrapper is used to interface the core and the MWMR controller avalaible here VciMwmrController.

3) CABA Implementation

a) Component definition & usage

Component definition

• source:trunk/soclib/soclib/module/ofdm_chain_components/demapping/caba/metadata/demapping.sd​

Usage

Demapping has a fifo_depth parameter, which defines the fifo depth for the input. For example with a FIFO depth equal to 16 :

Uses('Demapping', fifo_depth = 16);

b) CABA sources

• interface : source:trunk/soclib/soclib/module/ofdm_chain_components/demapping/caba/source/include/demapping.h​
• implementation : source:trunk/soclib/soclib/module/ofdm_chain_components/demapping/caba/source/src/demapping.cpp​

CABA Constructor parameters

Demapping(
     sc_module_name name,                     // Instance name
     int ncycles)  // Number of computation cycles

CABA Ports

• sc_in<bool> p_resetn : hardware reset
• sc_in<bool> p_clk : clock
• soclib::caba::FifoOutput<uint32_t> p_to_ctrl : interface from the demapping to the MWMR controller
• soclib::caba::FifoInput<uint32_t> p_from_ctrl : interface from the MWMR controller to the demapping

3) TLM-DT Implementation

a) Component definition & usage

Component definition

• source:trunk/soclib/soclib/module/ofdm_chain_components/demapping/tlmdt/metadata/demapping.sd​

b) TLM-DT sources

• interface : source:trunk/soclib/soclib/module/ofdm_chain_components/demapping/tlmdt/source/include/demapping.h​
• implementation : source:trunk/soclib/soclib/module/ofdm_chain_components/demapping/tlmdt/source/src/demapping.cpp​

TLM-DT Constructor parameters

Demapping(sc_core::sc_module_name name, // Instance name
	      uint32_t id,
	      uint32_t read_fifo_depth, // Depth of input buffer
	      uint32_t write_fifo_depth, // Depth of output buffer
	      uint32_t n_read_channels, // Number of read channels
	      uint32_t n_write_channels, // Number of write channels
	      uint32_t n_config, // Number of configurations
	      uint32_t n_status); // Number of status

TLM-DT Ports

• std::vector<tlm_utils::simple_target_socket_tagged<Demapping,32,tlm::tlm_base_protocol_types> *> p_config: configuration port
• std::vector<tlm_utils::simple_target_socket_tagged<Demapping,32,tlm::tlm_base_protocol_types> *> p_status: status port
• std::vector<tlm_utils::simple_initiator_socket_tagged<Demapping,32,tlm::tlm_base_protocol_types> *> p_read_fifo: port from the MWMR controller to the demapping
• std::vector<tlm_utils::simple_initiator_socket_tagged<Demapping,32,tlm::tlm_base_protocol_types> *> p_write_fifo: port from the demapping to the MWMR controller