参数资料
型号: HW-V5-ML561-UNI-G
厂商: Xilinx Inc
文件页数: 138/140页
文件大小: 0K
描述: EVALUATION PLATFORM VIRTEX-5
产品变化通告: Adapter Replacement 23/May/2008
Development Systems Discontinuation 16/Jan/2012
标准包装: 1
系列: Virtex®-5 LXT
类型: FPGA
适用于相关产品: XC5VLX50T-FFG1136
所含物品: 开发平台,小型闪存卡,缆线,DDR2 DIMM,电源和软件
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Appendix C: LCD Interface
R
Figure C-11 shows a block diagram of the LCD character generator controller. Character
data is latched and then shifted left three positions. This shifted value is the start byte for a
counter that outputs an address to the block RAM. The result is a stream of bytes
representing a character for the display.
A small second counter determines when a new character is loaded into the block RAM
address counter.
Po s ition
Regi s ter
P a ge
8
D a t a In
De s R s t
11
Co u nter A
11
DI
Addr
DO
8
0
1
8
D a t a
En a
R s t
Clk
8
E
Di s pl a y
3
Clk
E
L
De s R s t
En a
Ss r
We
RAMB16_ S 9
Regi s ter
De s R s t
De s R s t
Clk
Clk
Co u nter B
E
TC
Lo a d
LUT-ROM
Di s pl a y
Clk
Co u nt to 8.
De s R s t
Initi a liz a tion
De s R s t
S top b oth co u nter s a t TC.
S end ch a r a cter po s ition a nd
line to the LCD.
Lo a d new v a l u e in co u nter A.
R s t
En a
S t a te M a chine
R S
RW
E
S witch to ch a r a cter ROM.
Clk
En ab le co u nter s .
UG199_C_11_050106
Figure C-11:
LCD Character Generator Controller
A state machine manages the processing order.
A minimum cycle time of 400 ns on the E signal used as a reference. The 200 MHz system
clock frequency is used as reference system clock. One E cycle uses at least 80 system clock
cycles when the design is running at 200 MHz. The E pulse is part of the state machine, and
the design only depends on the system clock. Timing is met as long as the system clock
does not exceed 200 MHz.
This design can be adapted easily to fit the MicroBlaze? or PPC405 CoreConnect bus
system.
138
Virtex-5 FPGA ML561 User Guide
UG199 (v1.2.1) June 15, 2009
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