IO Device: Segment 7 segment display - Revizia istoricului

Cbira: /* Implementing the control circuit */

2018-05-11T18:19:03Z

Implementing the control circuit

Cbira la 11 mai 2018 18:17

2018-05-11T18:17:45Z

Cbira: /* Implementing the control circuit */

2018-05-11T18:16:00Z

Implementing the control circuit

Cbira: /* Implementing the control circuit */

2018-05-11T18:15:42Z

Implementing the control circuit

Cbira: /* Implementing control circuit */

2018-05-11T18:15:30Z

Implementing control circuit

Cbira: Pagină nouă: 7-segment display The 7-segment display is used to display numeric (or even alphanumeric) values in natural format, rather than in binary, using...

2018-04-26T07:15:00Z

Pagină nouă: thumb | 7-segment display The 7-segment display is used to display numeric (or even alphanumeric) values in natural format, rather than in binary, using...

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[[File: Seg0.gif | thumb | 7-segment display]]

The 7-segment display is used to display numeric (or even alphanumeric) values in natural format, rather than in binary, using the LEDs.

== Segment Control ==

'''Attention:''' The 7-segment display control is controlled separately by each segment. Control is done on negative logic, so when the value 0 is propagated to the pin corresponding to a segment, it is lit and when the pin is 1, the segment is off. An example of a control sequence that will illuminate the figure 2 is shown in the figure:

[[File: Seg1.png | Example of control sequence for figure 2]]

Thus, we will need a circuit with an 8-bit output that will represent the control code for the desired value, which will represent the number we want to see displayed:
* for the desired value 0, the control code will be 8'b10000100 (all segments lit, except the middle and the dot);
* for the desired value 1, the control code will be 8'b11110101 (the right-hand segments lit, the remainder off);
* for the desired value 2, the control code will be 8'b10011000 (see previous figure);
* ... etc.

These values depend on the convention chosen for bit-segment correspondence. For the example above, the order of segments is PDEFCGBA (bit 7 corresponds to the point, bit 6 corresponds to segment D, etc.). Any other permutation of segments is correct, provided the order in the segment control module is reflected in the "Implementation Constraints File".

'''Caution:''' The pins to which the segments are linked are written on the development board on the drawing above the display (for Nexys 2, they have the same names as those on the above drawing).

== Number control ==

Segment control is common to all 4 digits available on the board. This means that all segments in the same position in all four digits are linked to the same pin (ie, all active figures at a given point in time will display the same value). Turning on or off a digit is also done on logic denied using pins bound to AN3-AN0 devices. Therefore, the module that controls the 7-segment display will have, besides the 8-bit output needed to control the segments, another 4-bit output that will control the status of each digit (on or off).

== Implementing control circuit ==

The usual implementation for the control circuit is with a [[ROM ROM | memory ROM]).

← Versiunea anterioară		Versiunea de la data 11 mai 2018 18:19
Linia 25:		Linia 25:
	== Implementing the control circuit ==		== Implementing the control circuit ==

−	The usual implementation for the control circuit is with a [[~~ROM_memory~~]].	+	The usual implementation for the control circuit is with a [[ROM Memory \| ROM memory]].

← Versiunea anterioară		Versiunea de la data 11 mai 2018 18:17
Linia 25:		Linia 25:
	== Implementing the control circuit ==		== Implementing the control circuit ==

−	The usual implementation for the control circuit is with a [[~~ROM memory~~]].	+	The usual implementation for the control circuit is with a [[ROM_memory]].

← Versiunea anterioară		Versiunea de la data 11 mai 2018 18:16
Linia 25:		Linia 25:
	== Implementing the control circuit ==		== Implementing the control circuit ==

−	The usual implementation for the control circuit is with a [[ROM memory]).	+	The usual implementation for the control circuit is with a [[ROM memory]].

← Versiunea anterioară		Versiunea de la data 11 mai 2018 18:15
Linia 25:		Linia 25:
	== Implementing the control circuit ==		== Implementing the control circuit ==

−	The usual implementation for the control circuit is with a [[ROM ~~ROM \|~~ memory ~~ROM~~]).	+	The usual implementation for the control circuit is with a [[ROM memory]).

@@ Linia 23: / Linia 23: @@
 Segment control is common to all 4 digits available on the board. This means that all segments in the same position in all four digits are linked to the same pin (ie, all active figures at a given point in time will display the same value). Turning on or off a digit is also done on logic denied using pins bound to AN3-AN0 devices. Therefore, the module that controls the 7-segment display will have, besides the 8-bit output needed to control the segments, another 4-bit output that will control the status of each digit (on or off).
-== Implementing control circuit ==
+== Implementing the control circuit ==
 The usual implementation for the control circuit is with a [[ROM ROM | memory ROM]).

IO Device: Segment 7 segment display - Revizia istoricului

Cbira: /* Implementing the control circuit */

Cbira la 11 mai 2018 18:17

Cbira: /* Implementing the control circuit */

Cbira: /* Implementing the control circuit */

Cbira: /* Implementing control circuit */

Cbira: Pagină nouă: 7-segment display The 7-segment display is used to display numeric (or even alphanumeric) values ​​in natural format, rather than in binary, using...

Cbira: Pagină nouă: 7-segment display The 7-segment display is used to display numeric (or even alphanumeric) values in natural format, rather than in binary, using...