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Epson Research and Development
Page 61
Vancouver Design Center
Hardware Functional Specification
SED1352
Issue Date: 99/07/28
X16-SP-001-16
9.2 SRAM Access Time
9.2.1 8-Bit Display Memory Interface:
9.2.2 16-Bit Display Memory Interface:
9.3 Frame Rate Calculation
9.3.1 For Single Panel
:
9.3.2 For Dual Panel
:
Where
DHNDP is Default Horizontal Non-Display Period in term of pixels:
DHNDP = 16 pixels per panel.
9.4 Memory Size Calculation
Memory Size (bytes) =
Example: For a 640x480, 4 gray shades (2 bits-per-pixel) system:
Memory Size (bytes) =
Table 9-1: 8-Bit Display Memory Interface SRAM Access Time
Display Mode
3V/3.3V
5V
16-level gray shades
Access time < 1 / f
OSC
- 50ns
Access time < 1 / f
OSC
- 30ns
4-level gray shades
Access time < 2 / f
OSC
- 50ns
Access time < 2 / f
OSC
- 30ns
Table 9-2: 16-Bit Display Memory Interface SRAM Access Time
Display Mode
3V/3.3V
5V
16-level gray shades
Access time < 2 / f
OSC
- 50ns
Access time < 2 / f
OSC
- 30ns
4-level gray shades
Access time < 4 / f
OSC
- 50ns
Access time < 4 / f
OSC
- 30ns
FrameRate
f
osc
HorizontalPixels
DHNDP
+
(
)
VerticalLines
4
+
(
)
×
----------------------------------------------------------------------------------------------------------------------------------------
=
FrameRate
f
osc
HorizontalPixels
DHNDP
+
(
)
2
×
VerticalLines
2
------------------------------------
2
+
×
--------------------------------------------------------------------------------------------------------------------------------------------------
=
HorizontalPixels
(
)
VerticalLines
(
)
BitsPerPixel
(
)
×
×
8
------------------------------------------------------------------------------------------------------------------------------------------------
640
(
)
480
(
)
2
( )
×
×
8
------------------------------------------------
76800bytes
75Kbyte
=
=