Changes between Version 17 and Version 18 of Component/Vci Block Device

Timestamp:

Nov 21, 2009, 2:28:59 PM (14 years ago)

Author:

alain

Comment:

--

Component/Vci Block Device

@@ -5 +5 @@
 == 1) Functional Description ==
 
-This VCI component is both a target and an initiator.
+This component emulate a -simplified - disk controller, that can perform data
+transfers between a file belonging to the host system and a buffer in the memory
+of the virtual system. The file name is an argument of the constructor,
+as well as the block sie (in bytes), and the simulated access latency (in cycles).
+As most block devices, this VCI component has a DMA capability, and is both a target and an initiator.
  * It is addressed as a target to be configured for a transfer.
  * It is acting as an initiator to do the transfer
 
-There is only one block device handled by this component. It can be seen as one single ''file'', that has a storage capacity limited to 2^41^ bytes.
-An IRQ is optionally asserted when transfer is finished.
+There is only one block device handled by this component. Both read and write
+transfers are supported.
+An IRQ is optionally asserted when transfer is completed.
 
 This hardware component checks for segmentation violation, and can be used
@@ -85 +90 @@
      const soclib::common::IntTab &tgtid,    // Target index
      const std::string &filename, // mapped file, may be a host block device
-     const uint32_t block_size = 512 ); // one-block size
+     const uint32_t block_size = 512, // block size in bytes
+     const uint32_t latency = 0);  // initial access time (number of cycles)
 }}}
 
 === CABA Ports ===
 
- * sc_in<bool> '''p_resetn''' : Global system reset
- * sc_in<bool> '''p_clk''' : Global system clock
- * soclib::caba::!VciTarget<vci_param> '''p_vci_target''' : The VCI target port
- * soclib::caba::!VciInitiator<vci_param> '''p_vci_initiator''' : The VCI initiator port
- * sc_out<bool> '''p_irq''' : Interrupt port
+ * '''p_resetn''' : Global system reset
+ * '''p_clk''' : Global system clock
+ * '''p_vci_target''' : The VCI target port
+ * '''p_vci_initiator''' : The VCI initiator port
+ * '''p_irq''' : Interrupt port
 
 == 4) TLM-DT Implementation ==