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

Timestamp:

May 5, 2007, 8:31:34 PM (17 years ago)

Author:

alain

Comment:

--

Component/Vci Multi Tty

@@ +1 @@
+[wiki:Component SocLib Components General Index] 
+
+= !VciMultiTty Functional Description =
+
+This VCI target is a TTY terminal controller. This hardware component controls
+up to 256 terminals, emulated as XTERM windows. The number of emulated
+terminals is defined by the arguments in the constructor.
+The constructor creates as many UNIX XTERM processes as the number N of emulated terminals.
+It creates N PTY pseudo-terminals (one for each XTERM process), to support the bidirectional
+communication between the TTY controller process and the XTERM processes. 
+Each terminal is acting both as a character display, and a keyboard interface.
+For each terminal, a specific IRQ is activated when a character is entered at the keyboard. 
+The terminal 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 TTY controller contains 3 memory mapped registers:
+
+ * '''TTY_DISPLAY'''     : ADDRESS![3:0] = 0x0
+This 8 bits pseudo-register is write only.
+Any write request will interpret the 8 LSB bits of the WDATA field
+as an ASCII character, and this character will be displayed on the addressed terminal. 
+
+ * '''TTY_KEY_STS''' : ADDRESS![3:0] = 0x4 
+This Boolean status register is read-only. 
+A read request returns the zero value if there is no pending character.
+It returns a non zero value if there is a pending character in the keyboard buffer. 
+
+ * '''TTY_KEY_BUF'''    : ADDRESS![3:0] = 0x8
+This 8 bits register contains one single ASCII character. 
+This register is read-only. A read request returns the ACSII character
+in the 8 LSB bits of the RDATA field, and reset the status register
+
+= !VciMultiTty CABA  Implementation =
+
+The caba implementation is in 
+ * source:trunk/soclib/systemc/include/caba/target/vci_multi_ram.h
+ * source:trunk/soclib/systemc/src/caba/target/vci_multi_ram.cc
+
+== Template parameters: ==
+ * The VCI parameters
+
+== Constructor parameters ==
+{{{
+VciMultiTty(
+     sc_module_name name,   // Instance name
+     const soclib::common::IntTab &index,   //  Target index
+     const soclib::common::MappingTable &mt,   // Mapping Table
+     const char *first_tty_name,   // TTY names (as many names as terminals)
+     ...);
+}}}
+
+== Ports ==
+
+ * sc_in<bool> '''p_resetn''' : Global system reset
+ * sc_in<bool> '''p_clk''' : Global system clock
+ * soclib::common::!VciiTarget<vci_param> '''p_vci''' : The VCI port
+ * sc_out<bool> '''*p_irq''' : Pointer on the interrupt ports array.