Changes between Initial Version and Version 1 of Component/Vci Multi Timer

Timestamp:

May 5, 2007, 2:17:20 PM (17 years ago)

Author:

alain

Comment:

--

Component/Vci Multi Timer

@@ +1 @@
+= Functional Description =
+
+This VCI target is a memory mapped peripheral that can
+control up to 256 software controlled timers.
+Each timer can optionally generates an independent periodic interrupt.
+The memory segment allocated to this component must be aligned
+on 4K bytes boundary.
+The timer index i is defined by the ADDRESS[12:4] bits.
+This hardware component cheks for segmentation violation, and can be used
+as a default target.
+
+Each timer contains 4 memory mapped registers:
+
+ * '''TIMER_VALUE'''     : ADDRESS[3:0] = 0x0
+This 32 bits register is unconditionnally incremented at each cycle.
+A read request returns the current time contained in this register.
+A write request sets a new value in this register.
+
+ * '''TIMER_RUNNING''' : ADDRESS[3:0] = 0x4 
+When the Boolean value contained in this register is true, 
+the corresponding interrupt is enabled.  
+A write request of a zero gives resets this register.
+A write request of a non-zero value sets this registe.
+
+ * '''TIMER_PERIOD'''    : ADDRESS[3:0] = 0x8
+This 32 bits register defines the period between two successive interrupts.
+A write request writes a new value in this register, and the TIMER_RUNNING
+register is set to false.
+A read request returns the current value in this register.
+
+ * '''TIMER_RESETIRQ''' : ADDRESS[3:0] = 0xC
+Any write request in this Boolean register will reset the pending IRQ.
+A read request returns the zero value when there is no pending interrupt,
+and returns a non zero value if there is a pending interrupt.
+
+= CABA  Implementation =
+
+The caba implementation is in 
+ * source:trunk/soclib/systemc/include/caba/target/vci_multi_timer.h
+ * source:trunk/soclib/systemc/src/caba/target/vci_multi_timer.cc
+
+== Template parameters: ==
+ * The VCI parameters
+
+== Constructor parameters ==
+ * Component Name
+ * Target index
+ * MappingTable reference
+ * Number of available timers
+
+== Ports ==
+ * p_vci: the VCI port
+ * p_resetn: Global system reset
+ * p_clk: Global system clock