SNL320
16-Bit LCD Controller
12.3 Maximum Memory Expend
SNL320 also provides a special function extend the memory size from 64M-bit up to
128M-bit for single external device. The chip select pin “CS3” can be turn to the
address pin “A23” once user enable the control bit of “CS3” & “EA23” of extension bus
control register.
Data Bus ED[0..15]
DEVICE #3
A23
DEVICE #2
DEVICE #1
EA23 (CS3\)
CE\
CE\
CE\
Address Bus EA[0..22]
CS2\
CS1\
CS0\
SNL320
12.4 NAND Flash Interface
SNL320 provides a special function to access data from the external NAND flash
memory. The following table is shown the relative pins of NAND flash memory
interface. P3.3~P3.7 will becomes to be the control signal of NAND flash memory once
the property control register was setting, and data bus of NAND flash memory are
shared with the data bus D0~D7 of extension bus. All the data read/write are easy to
implement by the software.
I/O Pin Pin Name Direction
Descriptions
NAND flash memory chip enable pin
Command latch enable
Address latch enable
P3.3
P3.4
P3.5
P3.6
P3.7
RD\
NCSB
CLE
ALE
R/B\
WPB
RD\
O
O
O
I
NAND Flash memory Ready / Busy output
Write protect
O
O
O
IO
Read signal
WR\
WR\
Write signal
ED0~ED7 D0~D7
Data bus D0~D7
Ver: 1.2
17
July 22, 2005
SONIX [ SONIX TECHNOLOGY COMPANY ]
