Changes between Version 26 and Version 27 of Component/Vci Block Device

Timestamp:

Sep 30, 2015, 3:18:13 PM (10 years ago)

Author:

alain

Comment:

--

Component/Vci Block Device

@@ -41 +41 @@
 
  * '''BLOCK_DEVICE_STATUS''' (read only) 
-State of the transfer. Reading this register while not busy resets its value to IDLE, and acknowledge the IRQ. Value may be one of :
+Transfer status: Reading this register while not BUSY resets its value to IDLE, and acknowledge the IRQ. Value may be one of :
 ||    `BLOCK_DEVICE_IDLE`          ||
 ||    `BLOCK_DEVICE_BUSY`          ||
@@ -48 +48 @@
 ||    `BLOCK_DEVICE_READ_ERROR`    ||
 ||    `BLOCK_DEVICE_WRITE_ERROR`   ||
+Writing any value to this register makes a soft reset: if the status is not IDLE, the on-going transfer is stopped as soon as possible, and the status is reset to IDLE.
 
  * '''BLOCK_DEVICE_IRQ_ENABLE''' (read/write) 
@@ -58 +59 @@
 Block size (in bytes)
 
+When the component is not IDLE, only the BLOCK_DEVICE_STATUS register can be accessed by software:
+Any read/write access to any other register returns an error.
+
 For extensibility issues, you should access this component using globally-defined offsets.
-You should include file `soclib/block_device.h` from your software, it
-defines `BLOCK_DEVICE_COUNT`, `BLOCK_DEVICE_READ`, ...
+You should include file `soclib/block_device.h` that defines `BLOCK_DEVICE_COUNT`, `BLOCK_DEVICE_READ`, ...
 
 Sample code: