bcm_rod_slink.bcm_rod_slink_arc Architecture Reference

S-Link interface. More...

Inheritance diagram for bcm_rod_slink.bcm_rod_slink_arc:

Collaboration diagram for bcm_rod_slink.bcm_rod_slink_arc:

List of all members.

Processes

slink_fsm ( CLK , SCLR )

S-Link FSM.

Types

bcm_slink_fsm_state_typedef ( link_idle , link_down , link_write , link_notransfer , link_full , link_wait1 , link_wait2 , link_wait3 )

S-Link FSM states.

Signals

fsm_state bcm_slink_fsm_state_typedef

enable std_logic

fsm_stop std_logic

intern_slink_full_flag std_logic

intern_slink_down std_logic

intern_enable std_logic

intern_data_pending std_logic

Component Instantiations

slink_full_FDRSE FDRSE

FF primitive, synchronous set/reset.

slink_down_FDRSE FDRSE

FF primitive, synchronous set/reset, pos clk edge.

enable_FDRSE FDRSE

FF primitive, synchronous set/reset, pos clk edge.

control_word_FDRSE FDRSE

FF primitive, synchronous set/reset, pos clk edge.

data_vld FDRSE

FF primitive, synchronous set/reset, pos clk edge.

data_register FDRSE

FF primitive, synchronous set/reset, pos clk edge.

Detailed Description

S-Link interface.

Definition at line 71 of file bcm_rod_slink.vhd.

Member Function Documentation

[Process]

slink_fsm		( CLK ,
		SCLR )

S-Link FSM.

Definition at line 185 of file bcm_rod_slink.vhd.

00185   slink_fsm : process (CLK, SCLR)
00186   begin
00187     if (SCLR = '1') then
00188       fsm_state          <= link_idle;
00189       fsm_stop           <= '1';
00190       slink_write_enable <= '1';
00191     elsif (CLK'event and CLK = '1') then
00192       if (intern_slink_down = '0' and formatter_ignore_slink_status = '0') then
00193         fsm_state          <= link_down;
00194         fsm_stop           <= '1';
00195         slink_write_enable <= '1';
00196       else
00197         case fsm_state is
00198           when link_idle =>
00199             fsm_stop <= '0';
00200             if (formatter_data_valid = '1') then
00201               fsm_state          <= link_write;
00202               slink_write_enable <= '0';
00203             else
00204               fsm_state <= link_notransfer;
00205             end if;
00206           when link_write =>
00207             if ((intern_slink_full_flag = '1' or formatter_ignore_slink_status = '1') and formatter_data_valid = '0') then
00208               fsm_state          <= link_notransfer;
00209               slink_write_enable <= '1';
00210             elsif (intern_slink_full_flag = '0' and formatter_ignore_slink_status = '0') then
00211               fsm_state          <= link_full;
00212               slink_write_enable <= '1';
00213             else
00214               fsm_state <= link_write;
00215             end if;
00216           when link_notransfer =>
00217             if ((intern_slink_full_flag = '1' or formatter_ignore_slink_status = '1') and formatter_data_valid = '1') then
00218               fsm_state          <= link_write;
00219               slink_write_enable <= '0';
00220             elsif (intern_slink_full_flag = '0' and formatter_ignore_slink_status = '0') then
00221               fsm_state <= link_full;
00222             else
00223               fsm_state <= link_notransfer;
00224             end if;
00225           when link_full =>
00226             if (formatter_ignore_slink_status = '1') then
00227               -- After a reset the ignore SlinkStatus might be set to '0'.
00228               -- if there is active ('0') lff line the STM ends up in the
00229               -- LinkFull_state. In order to ignore the lff there must be
00230               -- a way to escape the state if the ignoreSlinkStatus line
00231               -- is set to '1' later. Therfore this condition here.
00232               fsm_state <= link_idle;
00233             elsif (intern_slink_full_flag = '1' and intern_data_pending = '1') then
00234               fsm_state          <= link_write;
00235               slink_write_enable <= '0';
00236             elsif (intern_slink_full_flag = '1' and intern_data_pending = '0') then
00237               fsm_state <= link_notransfer;
00238             else
00239               fsm_state <= link_full;
00240             end if;
00241           when link_down =>
00242             fsm_state <= link_wait1;
00243           when link_wait1 =>
00244             fsm_state <= link_wait2;
00245           when link_wait2 =>
00246             fsm_state <= link_wait3;
00247           when link_wait3 =>
00248             fsm_state <= link_idle;
00249             fsm_stop  <= '0';
00250         end case;
00251       end if;
00252     end if;
00253   end process slink_fsm;

Member Data Documentation

bcm_slink_fsm_state_typedef ( link_idle , link_down , link_write , link_notransfer , link_full , link_wait1 , link_wait2 , link_wait3 ) [Type]

S-Link FSM states.

Definition at line 74 of file bcm_rod_slink.vhd.

control_word_FDRSE FDRSE [Component Instantiation]