altremote_update Megafunction

altremote_update (Remote Update) Megafunction

Parameterized remote update megafunction. The altremote_update megafunction allows for real-time reconfiguration of the device.

Altera^® recommends instantiating this function as described in Using the MegaWizard^® Plug-In Manager.

This topic contains the following information:

AHDL Function Prototype (also applies to Verilog HDL)
VHDL Component Declaration
VHDL LIBRARY-USE Declaration (not required if the VHDL Component Declaration is used)
Port Descriptions
Parameter Descriptions

AHDL Function Prototype (port name and order also apply to Verilog HDL):

FUNCTION altremote_update (clock, reset, data_in[11..0], param[2..0], read_param, write_param, reconfig, reset_timer )
   WITH (SIM_INIT_CONFIG, SIM_INIT_WATCHDOG_VALUE, SIM_INIT_PAGE_SELECT, SIM_INIT_STATUS )
   RETURNS (data_out[11..0], busy, pgmout[2..0] );

VHDL Component Declaration:

COMPONENT altremote_update
   GENERIC
      (SIM_INIT_CONFIG        : STRING  := "FACTORY";
      SIM_INIT_PAGE_SELECT    : INTEGER := 0;
      SIM_INIT_STATUS         : INTEGER := 0;
      SIM_INIT_WATCHDOG_VALUE : INTEGER := 0);

   PORT(clock, reset                                    : IN STD_LOGIC;
       read_param, reconfig, reset timer, writer param  : IN STD_LOGIC                     := '0';
       data_in                                          : IN STD_LOGIC_VECTOR(11 DOWNTO 0) := (OTHERS => '0');
       param                                            : IN STD_LOGIC_VECTOR(2 DOWNTO 0)  := (OTHERS => '0');
       busy                                             : OUT STD_LOGIC;
       data_out                                         : OUT STD_LOGIC_VECTOR(11 DOWNTO 0);
       pgmout                                           : OUT STD_LOGIC_VECTOR(2 DOWNTO 0);

END COMPONENT;

VHDL LIBRARY-USE Declaration

LIBRARY altera_mf;
USE altera_mf.altera_mf_components.all;

Port Descriptions:

INPUT PORTS

Port Name	Required	Description	Comments
`clock`	Yes	Clock input to the remote update block.
`reset`	Yes	Asynchronous reset input to the megafunction.
`data_in[]`	No	Data input used when writing parameter into the remote update block.	Input port `[11 DOWNTO 0]` wide.
`param[]`	No	Bus that specifies which parameter should be read or updated.	Input port `[2 DOWNTO 0]` wide.
`read_param`	No	Read signal for the parameter specified in `param[]` input port and fed to `data_out[]` output port.	The `data_out[]` port contains valid data after the `busy` port deasserts. To avoid multiple reads, you must assert signal for one clock cycle.
`write_param`	No	Write signal for the parameter specified in the `param[]` and with the value specified in `data_in[]`.	The `data_out[]` port contains valid data after the `busy` port deasserts. To avoid multiple reads, you must assert signal for one clock cycle.
`reconfig`	Yes	Indicates when reconfiguration begins using current parameters.
`reset_timer`	No	Reset signal for the watchdog timer.

OUTPUT PORTS

Port Name	Required	Description	Comments
`data_out[]`	No	Data output when reading parameters.	Output port `[11 DOWNTO 0]` wide.
`busy`	No	Busy signal that indicates when the remote update block is reading or writing data.	When the `read_param` is asserted, the `busy` signal goes high until the operation is complete.
`pgmout[]`	Yes	Specifies which page address of the configuration data is loaded when the remote update block is reconfigured.	Output port `[2 DOWNTO 0]` wide. The `pgmout[]` output port must be connected to an output pin.

Parameter Descriptions:

Parameter	Type	Required	Comments
`SIM_INIT_CONFIG`	String	No	Specifies the configuration of the remote update block only for simulation purposes . The `SIM_INIT_CONFIG` parameter does not affect compilation or the resulting programming file. Values are `"FACTORY"` or `"APPLICATION"`. When the `SIM_INIT_CONFIG` parameter is set to `FACTORY`, you can read and write remote update block parameters. When the `SIM_INIT_CONFIG` parameter is set to `APPLICATION`, you can only read remote update block parameters. If omitted, the default is `FACTORY`.
`SIM_INIT_WATCHDOG_VALUE`	Integer	No	Specifies the initial watchdog timer value only for simulation purposes. The `SIM_INIT_WATCHDOG_VALUE` parameter does not affect compilation or the resulting programming file. Values are `"0"` to `"4095"`. When the `SIM_INIT_WATCHDOG_VALUE` parameter is set to `0`, watchdog is disabled. When the `SIM_INIT_WATCHDOG_VALUE` parameter is set to a value greater than `0`, watchdog is enabled. If omitted, the default is `0`.
`SIM_INIT_PAGE_SELECT`	Integer	No	Specifies the page select value only for simulation purposes. The `SIM_INIT_PAGE_SELECT` parameter does not affect compilation or the resulting programming file. If omitted, the default is `0`.
`SIM_INIT_STATUS`	Integer	No	Specifies the status register value only for simulation purposes. The `SIM_INIT_STATUS` parameter does not affect compilation or the resulting programming file. If omitted, the default is `0`.

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