Appendix C: LCD Interface
Position
Register
Page
8
R
DataIn
DesRst
11
Counter A
11
DI
Addr
DO
8
0
1
8
Data
Ena
Rst
Clk
8
E
Display
3
Clk
E
L
DesRst
Ena
Ssr
We
RAMB16_S9
Register
DesRst
DesRst
Clk
Clk
Counter B
E
TC
Load
LUT-ROM
Display
Clk
Count to 8.
DesRst
Initialization
DesRst
Stop both counters at TC.
Send character position and
line to the LCD.
Load new value in counter A.
Rst
Ena
State Machine
RS
RW
E
Switch to character ROM.
Clk
Enable counters.
UG202_C_11_050906
Figure C-11:
LCD Character Generator Controller
A state machine takes care of 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.
84
ML550 Networking Interfaces Platform
UG202 (v1.4) April 18, 2008
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