XESS XStend, Manual

Page: 14 / 34

029- OE_ = 1; // disable the outputs from all the RAMs
030-
031- // the state of the pushbuttons will select which LED display will
032- // show the settings of the DIP switches. A bright LED corresponds
033- // to a DIP switch which is set to '1'.
034-
035- // When both pushbuttons are pressed, the DIP switch settings are
036- // shown on the LED display of the XS Board.
037- WHEN ((PUSH_SPARE_==0) & (PUSH_RESET_==0)) THEN {
038-
S = [DIPSW7..DIPSW1];
039- [LDP_,RS_6..RS_0] = ^B11111111;
040- [RDP_,LS_6..LS_0] = ^B11111111;
041- D_ = ^B11111111;
042- }
043- // When only the RESET pushbutton is pressed, the DIP switch settings
044- // are shown on the left LED display on the XStend Board.
045- ELSE WHEN ((PUSH_SPARE_==1) & (PUSH_RESET_==0)) THEN {
046-
S = ^B0000000;
047- [LDP_,LS_6..LS_0] = !(DIPSW);
048- [RDP_,RS_6..RS_0] = ^B11111111;
049- D_ = ^B11111111;
050- }
051- // When only the SPARE pushbutton is pressed, the DIP switch settings
052- // are shown on the right LED display on the XStend Board.
053- ELSE WHEN ((PUSH_SPARE_==0) & (PUSH_RESET_==1)) THEN {
054-
S = ^B0000000;
055- [LDP_,LS_6..LS_0] = ^B11111111;
056- [RDP_,RS_6..RS_0] = !(DIPSW);
057- D_ = ^B11111111;
058- }
059- // When neither pushbuttons is pressed, the DIP switch settings are
060- // shown on the string of LEDs of the XStend Board.
061- ELSE WHEN ((PUSH_SPARE_==1) & (PUSH_RESET_==1)) THEN {
062-
S = ^B0000000;
063- [LDP_,LS_6..LS_0] = ^B11111111;
064- [RDP_,RS_6..RS_0] = ^B11111111;
065- D_ = !(DIPSW);
066- }
067-
068- END EXP1
Listing 14: UCF file for LED/switch XStend example with XS40.
001- # XS40 BOARD LED CONNECTIONS (ACTIVE_HIGH)
002- NET S0
LOC=P25;
003- NET S1 LOC=P26;
004- NET S2 LOC=P24;
005- NET S3 LOC=P20;
006- NET S4 LOC=P23;
007- NET S5 LOC=P18;
008- NET S6 LOC=P19;
009- #
010- # MICROCONTROLLER PINS
011- NET RST
LOC=P36; # ACTIVE-HIGH RESET
012- #
013- # XS40 BOARD RAM CONTROL PINS
014- NET OE_
LOC=P61; # ACTIVE-LOW OUTPUT ENABLE
015- #
016- #