参数资料
型号: HW-SPAR3AN-SK-UNI-G
厂商: Xilinx Inc
文件页数: 54/140页
文件大小: 0K
描述: KIT STARTER SPARTAN-3 AN
产品变化通告: Adapter Replacement 23/May/2008
标准包装: 1
系列: Spartan®-3AN
类型: FPGA
适用于相关产品: Spartan-3AN XC3S700AN-FG484,XCF04S-VOG20C
所含物品: 面板、缆线、软件、数据表和用户手册
相关产品: XC3S700AN-5FGG484C-ND - IC FPGA SPARTAN-3A 700K 484-FBGA
122-1598-ND - IC FPGA SPARTAN -3AN700K 484FBGA
122-1556-ND - IC SPARTAN-3AN FPGA 700K 484FBGA
其它名称: 122-1528
HW-SPAR3AN-SK-UNI-G-PROMO
HW-SPAR3AN-SK-UNI-G-PROMO-ND
Chapter 5: Character LCD Screen
Power-On Initialization
The initialization sequence first establishes that the FPGA application wishes to use the
four-bit data interface to the LCD as follows:
R
1.
2.
3.
4.
5.
6.
7.
8.
9.
Wait 15 ms or longer, although the display is generally ready when the FPGA finishes
configuration. The 15 ms interval is 750,000 clock cycles at 50 MHz.
Write LCD_DB<7:4> = 0x3, and pulse LCD_E High for 12 clock cycles.
Wait 4.1 ms or longer, which is 205,000 clock cycles at 50 MHz.
Write LCD_DB<7:4> = 0x3, and pulse LCD_E High for 12 clock cycles.
Wait 100 μ s or longer, which is 5,000 clock cycles at 50 MHz.
Write LCD_DB<7:4> = 0x3, and pulse LCD_E High for 12 clock cycles.
Wait 40 μ s or longer, which is 2,000 clock cycles at 50 MHz.
Write LCD_DB<7:4> = 0x2, and pulse LCD_E High for 12 clock cycles.
Wait 40 μ s or longer, which is 2,000 clock cycles at 50 MHz.
Display Configuration
After the power-on initialization is completed, the four-bit interface is established. The
next part of the sequence configures the display:
1.
2.
3.
4.
Issue a Function Set command, 0x28, to configure the display for operation on the
Spartan-3A/3AN Starter Kit board.
Issue an Entry Mode Set command, 0x06, to set the display to automatically increment
the address pointer.
Issue a Display On/Off command, 0x0C to turn the display on and disable the cursor
and blinking.
Finally, issue a Clear Display command. Allow at least 1.64 ms (82,000 clock cycles)
after issuing this command.
Writing Data to the Display
To write data to the display, specify the start address, followed by one or more data values.
Before writing any data, issue a Set DD RAM Address command to specify the initial
seven-bit address in the DD RAM. See Figure 5-3 for DD RAM locations.
Write data to the display using a Write Data to CG RAM or DD RAM command. The eight-
bit data value represents the look-up address into the CG ROM or CG RAM, shown in
Figure 5-4 . The stored bitmap in the CG ROM or CG RAM drives the 5 x 8 dot matrix to
represent the associated character.
If the address counter is configured to auto-increment, as described earlier, the application
can sequentially write multiple character codes, and each character is automatically stored
and displayed in the next available location.
Continuing to write characters, however, eventually falls off the end of the first display
line. The additional characters do not automatically appear on the second line because the
DD RAM map is not consecutive from the first line to the second.
54
www.xilinx.com Spartan-3A/3AN FPGA Starter Kit Board User Guide
UG334 (v1.1) June 19, 2008
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