Sram Access Time; 8-Bit Display Memory Interface; Frame Rate Calculation; For Single Panel - Epson SED1352 Technical Manual

Epson Research and Development
Vancouver Design Center

9.2 SRAM Access Time

9.2.1 8-Bit Display Memory Interface:

Table 9-1: 8-Bit Display Memory Interface SRAM Access Time

Display Mode
16-level gray shades
4-level gray shades
9.2.2 16-Bit Display Memory Interface:

Table 9-2: 16-Bit Display Memory Interface SRAM Access Time

Display Mode
16-level gray shades
4-level gray shades

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) =
Hardware Functional Specification
Issue Date: 99/07/28
Access time < 1 / f
Access time < 2 / f
Access time < 2 / f
Access time < 4 / f
FrameRate = --------------------------------------------------------------------------------------------------------------------------------------- -
(
HorizontalPixels
FrameRate = ------------------------------------------------------------------------------------------------------------------------------------------------- -
(
HorizontalPixels
( ) × (
HorizontalPixels VerticalLines
----------------------------------------------------------------------------------------------------------------------------------------------- -
( ) × ( ) × 2 ( )
640 480
----------------------------------------------- - = 76800bytes
8
3V/3.3V
- 50ns Access time < 1 / f
OSC
- 50ns Access time < 2 / f
OSC
3V/3.3V
- 50ns Access time < 2 / f
OSC
- 50ns Access time < 4 / f
OSC
f osc
) × (
+ DHNDP VerticalLines 4
f osc

VerticalLines
) 2 × ×
+ DHNDP ----------------------------------- -

) × (
BitsPerPixel
8
= 75Kbyte
5V
- 30ns
OSC
- 30ns
OSC
5V
- 30ns
OSC
- 30ns
OSC
)
+

+ 2

2
)
X16-SP-001-16
Page 61
SED1352