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dsdb:rm [2016/05/04 06:01] – sbobrowiczdsdb:rm [2022/10/04 11:38] (current) – external edit 127.0.0.1
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 ======= DSDB Reference Manual ======= ======= DSDB Reference Manual =======
-====== Overview ====== 
  
 {{ :dsdb:dsdb-obl-600.png?nolink&400|}} {{ :dsdb:dsdb-obl-600.png?nolink&400|}}
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 The DSDB is compatible with Xilinx’s new high-performance Vivado Design Suite as well as the ISE/EDK toolset. These toolsets meld FPGA logic design with embedded ARM software development into an easy to use, intuitive design flow. They can be used for designing systems of any complexity, from a complete operating system running multiple server applications in tandem, down to a simple bare-metal program that controls some LEDs. The DSDB is compatible with Xilinx’s new high-performance Vivado Design Suite as well as the ISE/EDK toolset. These toolsets meld FPGA logic design with embedded ARM software development into an easy to use, intuitive design flow. They can be used for designing systems of any complexity, from a complete operating system running multiple server applications in tandem, down to a simple bare-metal program that controls some LEDs.
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 On-board auxiliary buffers and electronic switches control the direction of signals that differ between Source and Sink. These signals are summarized Table 14. On-board auxiliary buffers and electronic switches control the direction of signals that differ between Source and Sink. These signals are summarized Table 14.
  
-|  **Signal**  |  **Role**  |  **Description**                                             |  **Direction (Zynq POW)**  |  **How to control**  | +|  **Signal**  |  **Role**  |  **Description**                                             |  **Direction (Zynq POW)**          |  **How to control**  | 
-|  **HPD**     | Source     | Hot-plug detect; signals the presence of a Sink to a Source  | Input                      | HDMI_OUT_EN = 1      | +|  **HPD**     | Source     | Hot-plug detect; signals the presence of a Sink to a Source  | Input (requires internal pull-up)  | HDMI_OUT_EN = 1      | 
-| :::          | Sink       | :::                                                          | Output                     | HDMI_OUT_EN = 0      | +| :::          | Sink       | :::                                                          | Output                             | HDMI_OUT_EN = 0      | 
-|  **5V0**     | Source     | Auxiliary power for Sink                                     | Output                     | HDMI_OUT_EN = 1      | +|  **5V0**     | Source     | Auxiliary power for Sink                                     | Output                             | HDMI_OUT_EN = 1      | 
-| :::          | Sink       | :::                                                          | Input                      | HDMI_OUT_EN = 0      |+| :::          | Sink       | :::                                                          | Input                              | HDMI_OUT_EN = 0      |
  
 //Table 14. HDMI signal direction in Source and Sink roles. //Table 14. HDMI signal direction in Source and Sink roles.
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 The DSDB contains a four-digit common anode seven-segment LED display. Each of the four digits is composed of seven segments arranged in a “figure 8” pattern, with an LED embedded in each segment. Segment LEDs can be individually illuminated, so any one of 128 patterns can be displayed on a digit by illuminating certain LED segments and leaving the others dark, as shown in Figure 15. Of these 128 possible patterns, the ten corresponding to the decimal digits are the most useful. The DSDB contains a four-digit common anode seven-segment LED display. Each of the four digits is composed of seven segments arranged in a “figure 8” pattern, with an LED embedded in each segment. Segment LEDs can be individually illuminated, so any one of 128 patterns can be displayed on a digit by illuminating certain LED segments and leaving the others dark, as shown in Figure 15. Of these 128 possible patterns, the ten corresponding to the decimal digits are the most useful.
  
-{{ nexys4-ddr:n4s.png?600 |}} +{{ :basys3-_seven_segment_display.png?600 |}} 
-Figure 15. FIXME -- fix figure label by removing from image and placing in text+//Figure 15. Digit Illumination Patterns//
  
 The anodes of the seven LEDs forming each digit are tied together into one “common anode” circuit node, but the LED cathodes remain separate, as shown in Fig 16. The common anode signals are available as four “digit enable” input signals to the 4-digit display. The cathodes of similar segments on all four displays are connected into seven circuit nodes labeled CA through CG. For example, the four “D” cathodes from the four digits are grouped together into a single circuit node called “CD.”  These seven cathode signals are available as inputs to the 4-digit display. This signal connection scheme creates a multiplexed display, where the cathode signals are common to all digits but they can only illuminate the segments of the digit whose corresponding anode signal is asserted.  The anodes of the seven LEDs forming each digit are tied together into one “common anode” circuit node, but the LED cathodes remain separate, as shown in Fig 16. The common anode signals are available as four “digit enable” input signals to the 4-digit display. The cathodes of similar segments on all four displays are connected into seven circuit nodes labeled CA through CG. For example, the four “D” cathodes from the four digits are grouped together into a single circuit node called “CD.”  These seven cathode signals are available as inputs to the 4-digit display. This signal connection scheme creates a multiplexed display, where the cathode signals are common to all digits but they can only illuminate the segments of the digit whose corresponding anode signal is asserted. 
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 {{ :basys3-_seven_segment_display_driving.png?500 |}} {{ :basys3-_seven_segment_display_driving.png?500 |}}
-Figure 16. FIXME -- Fix figure label+//Figure 16. Common Anode Circuit Node//
  
 A scanning display controller circuit can be used to show a four-digit number on this display. This circuit drives the anode signals and corresponding cathode patterns of each digit in a repeating, continuous succession at an update rate that is faster than the human eye can detect. Each digit is illuminated just one-fourth of the time, but because the eye cannot perceive the darkening of a digit before it is illuminated again, the digit appears continuously illuminated. If the update, or “refresh”, rate is slowed to around 45Hz, a flicker can be noticed in the display. A scanning display controller circuit can be used to show a four-digit number on this display. This circuit drives the anode signals and corresponding cathode patterns of each digit in a repeating, continuous succession at an update rate that is faster than the human eye can detect. Each digit is illuminated just one-fourth of the time, but because the eye cannot perceive the darkening of a digit before it is illuminated again, the digit appears continuously illuminated. If the update, or “refresh”, rate is slowed to around 45Hz, a flicker can be noticed in the display.
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 For each of the four digits to appear bright and continuously illuminated, all four digits should be driven once every 1 to 16ms, for a refresh frequency of about 1 KHz to 60Hz. For example, in a 62.5Hz refresh scheme, the entire display would be refreshed once every 16ms, and each digit would be illuminated for 1/4 of the refresh cycle, or 4ms. The controller must drive low the cathodes with the correct pattern when the corresponding anode signal is driven high. To illustrate the process, if AN0 is asserted while CB and CC are asserted, then a “1” will be displayed in digit position 1. Then, if AN1 is asserted while CA, CB, and CC are asserted, a “7” will be displayed in digit position 2. If AN0, CB, and CC are driven for 4ms, and then AN1, CA, CB, and CC are driven for 4ms in an endless succession, the display will show “71” in the first two digits. An example timing diagram for a four-digit controller is shown in Figure 17. For each of the four digits to appear bright and continuously illuminated, all four digits should be driven once every 1 to 16ms, for a refresh frequency of about 1 KHz to 60Hz. For example, in a 62.5Hz refresh scheme, the entire display would be refreshed once every 16ms, and each digit would be illuminated for 1/4 of the refresh cycle, or 4ms. The controller must drive low the cathodes with the correct pattern when the corresponding anode signal is driven high. To illustrate the process, if AN0 is asserted while CB and CC are asserted, then a “1” will be displayed in digit position 1. Then, if AN1 is asserted while CA, CB, and CC are asserted, a “7” will be displayed in digit position 2. If AN0, CB, and CC are driven for 4ms, and then AN1, CA, CB, and CC are driven for 4ms in an endless succession, the display will show “71” in the first two digits. An example timing diagram for a four-digit controller is shown in Figure 17.
  
-{{ nexys4-ddr:n4u.png?400 |}} +{{ :basys3-seven_segment_timing_diagram.png?400 |}} 
-Figure 17. FIXME -- fix figure label+//Figure 17. Four digit scanning display controller timing diagram//
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 ====== 17 Audio ====== ====== 17 Audio ======
  
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 Pmod connectors are 2x6, right-angle, 100-mil spaced female connectors that mate with standard 2x6 pin headers. Each 12-pin Pmod connector provides two 3.3V user power supplies (pins 6 and 12), two Ground signals (pins 5 and 11), and eight logic signals, as shown in Fig. 19. The 3.3V user supply is current limited to 0.3A and it is shared between Pmods, digital breadboard and MXP connector (J4). See section **1.2 User Power Supplies** and **1.3 User Power Supplies Monitoring** for a detailed description. Pmod connectors are 2x6, right-angle, 100-mil spaced female connectors that mate with standard 2x6 pin headers. Each 12-pin Pmod connector provides two 3.3V user power supplies (pins 6 and 12), two Ground signals (pins 5 and 11), and eight logic signals, as shown in Fig. 19. The 3.3V user supply is current limited to 0.3A and it is shared between Pmods, digital breadboard and MXP connector (J4). See section **1.2 User Power Supplies** and **1.3 User Power Supplies Monitoring** for a detailed description.
  
-{{ :zybo:pmod1f.png?300 |}} +{{ :basys3-pmod_connector.png?300 |}} 
-Figure 19. FIXME -- Remove figure label from picture and correctly label in text+//Figure 19. Pmod Connecter Front View//
  
 Digilent produces a large collection of Pmod accessory boards that can attach to the Pmod expansion connectors to add ready-made functions like A/D’s, D/A’s, motor drivers, sensors, and other functions. See www.digilentinc.com for more information. Digilent produces a large collection of Pmod accessory boards that can attach to the Pmod expansion connectors to add ready-made functions like A/D’s, D/A’s, motor drivers, sensors, and other functions. See www.digilentinc.com for more information.