Changes between Version 2 and Version 3 of mwr_driver

Timestamp:

Feb 28, 2015, 2:56:30 PM (10 years ago)

Author:

alain

Comment:

--

mwr_driver

@@ -6 +6 @@
 The [source:soft/giet_vm/giet_drivers/mwr_driver.c mwr_driver.c] and [source:soft/giet_vm/giet_drivers/mwr_driver.h mwr_driver.h] files define the MWR driver.
 
-The vci_mwmr_controller is a multi-channels hardware component that can be used to connect an hardware coprocesseur to one or several MWMR channels (software FIFOs implemented in memory). 
- * On the VCI side, it implements the five steps MWMR communication protocol.
- * On the coprocessor side, it implements as many FIFOs interfaces as the number of MWMR channels.
+The vci_mwmr_dma component is a multi-channels hardware component that can be used to connect an hardware coprocesseur to a VCI interconnect.
+This component provides the coprocessor one or several TO_COPROC or FROM_COPROC FIFO type communication channels, without address.
+Each T0_COPROC/FROM coproc port contains an hardware FIFO interface (data, r_wok, w_rok signals), plus three signals (REQ, ACK, BURSTS) allowing the coprocessor
+to request an integer number of data burst. Each burst contains a fixed number of 32 bits words. Each channel implements two running modes:
+ * in '''MWMR''' mode the channel FSM transfer an infinite" stream of data to or from a MWMR software FIFO, implementing the 7 steps MWMR protocol.
+ * in '''DMA''' mode the channel FSM transfer a fixed size chunk of data to or from a memory buffer, with a completion signaling interrupt.
 
 It is an ''internal'' peripheral, even if it is not replicated in all clusters.