SNL320
16-Bit LCD Controller
12.1 Word Mode Connection
Most of hi-density memory both provides word mode access, so SNL320 also support
word mode access bus by the pin option “EDSW”. Once the pin “EDSW” is connected
to VDD, means the bus width of extension bus will turn to be 16-bit width, the
connection diagram is shown as bellow. In word mode bus access, SNL320 can fetch
a complete OP code or data through the 16-bit width bus at one time, and it is helpful to
improved the CPU efficiency when CPU running the program from external memory
device. Most important, once the word access is selected, all the data access will fixed
at 16-bit mode. So if user connected a 8-bit width external device, the bus pin ED[8..15]
of extension bus don’t need to be connected.
SNL320
EA0~EA21
EA[0..21]
ED0~ED15
ED[0..15]
RD\
Q[0..15]
OE\
A0~A21
64M FLASH
CS1\
EDWS
VDD
CE\
BYTE\
VDD
Flash Memory Word Mode Connection
Note: The bit14 of EBCR control register MUST set to be “1”.
12.2 Byte Mode Connection
Considering the bus interface of some external devices and memory are also only 8-bit
bus width, so SNL320 also support the byte mode access bus for this kind of device. In
byte mode, only data pins ED[0..7] are valid and ED[8..15] are no used.
In byte mode connection, SNL320 provides two different modes for data access, one
is 8-bit mode and another is 16-bit mode. The detail description is shown as following
section.
Ver: 1.2
14
July 22, 2005
SONIX [ SONIX TECHNOLOGY COMPANY ]
