参数资料
型号: HW-SPAR3A-SK-UNI-G
厂商: Xilinx Inc
文件页数: 55/143页
文件大小: 0K
描述: KIT STARTER W/SPARTAN-3A
产品培训模块: FPGAs Spartan3
产品变化通告: Adapter Replacement 23/May/2008
标准包装: 1
系列: Spartan®-3A
类型: FPGA
适用于相关产品: Spartan?3A FPGA,XC3S700A-FG484
所含物品: 板,线缆,文档,电源
相关产品: XC3S700A-5FTG256C-ND - IC FPGA SPARTAN-3A 256K 256FTBGA
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XC3S700A-5FG484C-ND - IC SPARTAN-3A FPGA 700K 484FBGA
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XC3S700A-4FGG484I-ND - IC SPARTAN-3A FPGA 700K 484FBGA
更多...
其它名称: 122-1514
R
CLOCK
Operation
LCD_RS
LCD_DB<7:4>
0 = Command, 1 = Data
Valid Data
LCD_RW
LCD_E
230 ns
40 ns
10 ns
LCD_RS
LCD_DB<7:4>
LCD_RW
LCD_E
Upper
4 bits
1 μ s
Lower
4 bits
40 μ s
UG330_c5_03_072106
Figure 5-6: Character LCD Interface Timing
The data values on LCD_DB<7:4>, and the register select (LCD_RS) and the read/write
(LCD_RW) control signals must be set up and stable at least 40 ns before the enable LCD_E
goes High. The enable signal must remain High for 230 ns or longer—the equivalent of 12
or more clock cycles at 50 MHz.
In many applications, the LCD_RW signal can be tied Low permanently because the FPGA
generally has no reason to read information from the display.
Transferring Eight-Bit Data over the Four-Bit Interface
After initializing the display and establishing communication in four-bit mode, all
commands and data transfers to the character display are via eight bits, transferred using
two sequential four-bit operations. Each eight-bit transfer must be decomposed into two
four-bit transfers, spaced apart by at least 1 μ s, as shown in Figure 5-6 . The upper nibble is
transferred first, followed by the lower nibble. An eight-bit write operation must be spaced
least 40 μ s before the next communication. This delay must be increased to 1.64 ms
following a Clear Display command.
Initializing the Display
After power-on, the display must be initialized to establish the required communication
protocol. The initialization sequence is simple and ideally suited to the highly-efficient
eight-bit PicoBlaze embedded controller. After initialization, the PicoBlaze controller is
available for more complex control or computation beyond simply driving the display.
Spartan-3A FPGA Starter Kit Board User Guide
UG330 (v1.3) June 21, 2007
55
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