Page 24
Epson Research and Development
Vancouver Design Center
S1D13503
Hardware Functional Specification
X18A-A-001-08
Issue Date: 01/01/29
Table 5-2: Display Memory Interface
Pin
Name
Type
F00A
Pin #
F01A
Pin #
D00A
Pad #
Driver
Description
VD0-
VD15
I/O
44 - 51,
54 - 61
41 - 48,
51 - 58
54-55,
57-61,
64,
68-75
TS1D2
These pins are connected to the display memory data bus. For 16-
bit interface, VD0-VD7 are connected to the display memory data
bus of even byte addresses and VD8-VD15 are connected to the
display memory data bus of odd byte addresses. The output drivers
of these pins are placed in a high impedance state when RESET is
high.
On the falling edge of RESET, the values of VD0-VD15 are
latched into the chip to configure various hardware options (see
Section Table 5-6: on page 26).
VD0-VD15 each have an internal pull-down resistor (see Section
Table 6-3: on page 27).
VA0-
VA15
O
33 - 43,
62 - 66
30 - 40
59 - 63
38-40,
42-43,
45-46,
48-49,
51-52,
77-81
CO1
These pins are connected to the display memory address bus.
VCS1# O
69
66
84
CO1
Active low chip-select output to the second or odd byte address
SRAM. See Display Memory Interface section for details.
VCS0# O
68
65
83
CO1
Active low chip-select output to the first or even byte address
SRAM. See Display Memory Interface section for details.
VWE#
O
67
64
82
CO1
Active low output used for writing data to the display memory.
This pin is connected to the WE# input of the SRAMs.
VOE#
O
83
80
102
CO1
Active low output to enable reading of data from the display
memory. This pin is connected to the OE# input of the SRAMs.
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