Datasheet

4D SYSTEMS GOLDELOX Processor
© 2012 4D SYSTEMS Page 7 of 25 www.4dsystems.com.au
GOLDELOX PROCESSOR
5. Hardware Interface - Pins
The GOLDELOX provides both a hardware and
software interface. This section describes in detail
the hardware interface.
Display Interface 5.1.
The GOLDELOX supports LCD and OLED displays
with an 80-Series 8 bit wide CPU data interface.
The connectivity to the display is easy and straight
forward. The chip generates all of the necessary
timing to drive the display.
CS
RS
RD
WR
Operation
0
0
0
1
Read Display Status Register
0
0
1
0
Write Display Index Register
0
1
0
1
Read Display GRAM Data
0
1
1
0
Write Register or GRAM Data
1
X
X
X
No Operation
Display Operation Table
D0-D7 pins (Display Data Bus):
The Display Data Bus (D0-D7) is an 8 bit
bidirectional port and all data writes and reads
occur over this bus. Other control signals such as
RW, RD CS, and RS synchronise the data transfer to
and from the display.
CS pin (Display Chip Select):
The access to the display is only possible when the
Display Chip Select (CS) is asserted LOW. Connect
this pin to the Chip Select (CS) signal of the display.
RS pin (Display Register Select):
The RS signal determines whether a register
command or data is sent to the display.
LOW: Display index or status register is selected.
HIGH: Display GRAM or register data is selected.
Connect this pin to the Register Select (RS) signal
of the display. Different displays utilise various
naming conventions such as RS, A0, C/D or similar.
Be sure to check with your display manufacturer
for the correct name and function.
RES pin (Display Reset):
Display RESET. GOLDELOX initialises the display by
strobing this pin LOW. Connect this pin to the
Reset (RES) signal of the display. This signal can
also be used to control the back-light of the LCD or
as the DC/DC converter enable. Refer to the
reference design in Section 7 in this document for
an example.
WR pin (Display Write):
This is the display write strobe signal. The
GOLDELOX asserts this signal LOW when writing
data to the display in conjunction with the display
data bus (D0-D7). Connect this pin to the Write
(WR) signal of the display.
Item
Sym
Min
Typ
Max
Unit
Write Low Pulse
tWL
170
-
-
ns
Write High Pulse
tWH
85
-
-
ns
Write Bus Cycle Total
tWT
255
-
-
ns
Write Data Setup
tDS
85
-
-
ns
RD pin (Display Read):
This is the display read strobe signal. The
GOLDELOX asserts this signal LOW when reading
data from the display in conjunction with the
display data bus (D0-D7). Connect this pin to the
Read (RD) signal of the display.