VHDL Programming

202 Chapter Seven

aileron : OUT control;

elevator : OUT control);

END autopilot;

ARCHITECTURE block_level OF autopilot IS

COMPONENT alt_compare

PORT( alt_ref : IN alt;

PORT( alt_ind : IN alt;

PORT( up_down : OUT vdir);

END COMPONENT;

COMPONENT hdg_compare

PORT( hdg_ref : IN hdg;

PORT( hdg_ind : IN hdg;

PORT( left_right : OUT hdir);

END COMPONENT;

COMPONENT hdg_ctrl

PORT( left_right : IN hdir;

PORT( rdr : OUT control;

PORT( alrn : OUT control);

END COMPONENT;

COMPONENT alt_ctrl

PORT( up_down : IN vdir;

PORT( elevator : OUT control);

END COMPONENT;

SIGNAL up_down : vdir;

SIGNAL left_right : hdir;

FOR M1 : alt_compare USE CONFIGURATION WORK.alt_comp_con;

Indicated

Altitude

Desired

Altitude

Indicated

Heading

Desired

Heading

Up/Down

Left/Right

Elevator

Aileron

Rudder

Alt_Comp Alt_Ctrl

Hdg_Comp Hdg_Ctrl

Figure 7-5
Block Diagram of
Autopilot Example.