SPFD54124B Drise, SPFD54124B Datasheet - Page 112

• Manufacturer Part Number: SPFD54124B
• Description: 396-Channel 6-Bit Source Driver
• Manufacturer: Drise

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7.2.2.2 Read Cycle Sequence
The read cycle (RDX high-low-high sequence) means that the host reads information from display via interface. The display sends data
(D[17:0]) to the host when there is a falling edge of RDX and the host reads data when there is a rising edge of RDX.
Note: RDX is an unsynchronized signal (It can be stopped)
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LCD to Host]
Host to LCD
Driver [17:0]
Host [17:0]
D[17:0]
D[17:0]
RESX
D/CX
WRX
RDX
CSX
D[17:0]
RDX
CMD: Write command code
PA: Parameter or RAM data
DM: Dummy
‘1’
Fig. 7.2.2.2.2 8080-Series parallel bus protocol, Read data from register or display RAM
The display starts to
control D[17:0] lines
when there is a falling
edge of the RDX
S
S
S
S
CMD
CMD
CMD
Hi-Z
Read Parameter
Fig. 7.2.2.2.1 8080-Series RDX Protocol
Hi-Z
DM
DM
DM
PA
PA
PA
The host reads
D[17:0] lines when
there is a rising edge
of RDX
CMD
CMD
CMD
Hi-Z
Read display RAM data
112
DM
DM
DM
The display stops to
control D[17:0]
Hi-Z
data
data
data
Signal on D[17:0], DCX. R/WX, E pins
during CSX=’1’ are ignored
SPFD54124B
Preliminary
Preliminary Version: 0.6
data
data
data
APR. 26, 2007
P
P
P
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