Memory Size Calculation; Memory Size Requirement - Epson S1D13503 Series Technical Manual

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9.4 Memory Size Calculation

Memory Size (bytes) =
Example: For a 640 × 480, 4 gray shades (2 bits-per-pixel) system:
Memory Size (bytes) =

9.5 Memory Size Requirement

The following tables summarize the preceding information (formulae).
Input clock (f
OSC
memory interface that is being used. As a result, different resolutions will have different input clock
and memory requirements for a particular frame rate. Tables 9-3 through 9-5 summarize the mini-
mum memory size and access time requirements for various resolutions at a particular input clock
along with the corresponding frame rates.
Table 9-3 Memory Size Requirement: Number of Horizontal Pixels = 640
Display Black-and-White (BW)
Mode (1 bit-per-pixel)
Condition AUX[0C] = AUX[02]
Display
Size
Memory
(KB)
Interface
8-bit 40 ns
480 37.5
16-bit 125 ns
8-bit 60 ns
400 32
16-bit 160 ns
8-bit 85 ns
320 25
16-bit 210 ns
8-bit 125 ns
256 20
16-bit 290 ns
8-bit 125 ns
240 19
16-bit 290 ns
8-bit 160 ns
200 16
16-bit 360 ns
(1) Memory more than 128KB cannot be supported by S1D13503.
(2) Memory more than 64KB can only be supported through 16-bit display memory interface.
(3) 256 color mode must use 16-bit display memory interface.
∗ KB = K byte = 1024 bytes
1-58
(
HorizontalPixels
---------------------------------------------------------------------------------------------------------------------------------------------- -
( ) × ( ) × 2 ( )
640 480
----------------------------------------------- -
8
) is limited by SRAM access time depending on the display mode and display
Number of Horizontal Pixels = 640
4 Grays / 4 Colors
(2 bits-per-pixel)
AUX[0C] = 0
Access Time Access Time
Size
3V/ 3V/
(KB)
5V
3.3V 3.3V
55 ns (2)
75
140 ns 125 ns
75 ns 60 ns
62.5
175 ns 160 ns
100 ns 85 ns
50
225 ns 210 ns
140 ns 125 ns
40
305 ns 290 ns
140 ns 125 ns
37.5
305 ns 290 ns
175 ns 160 ns
32
375 ns 360 ns
) × ( ) × (
VerticalLines
8
= 76800bytes = 75Kbytes
16 Grays / 16 Colors
(4 bits-per-pixel)
AUX[0C] = 0
Access Time
Size
3V/
(KB)
5V 5V
3.3V
(2)
150 (1) (1)
140 ns
75 ns (2) (2)
125
175 ns 60 ns 75 ns
100 ns (2) (2)
100
225 ns 85 ns 100 ns
140 ns (2) (2)
80
305 ns 125 ns 140 ns
140 ns (2) (2)
75
305 ns 125 ns 140 ns
175 ns 60 ns 75 ns
62.5
375 ns 160 ns 175 ns
)
BitsPerPixel
256 Colors
(8 bits-per-pixel)
AUX[0C] = 0 Example
Access Time
Input
Size
Clock
3V/
(KB)
5V
(f )
OSC
3.3V
300 (1) (1) 24 MHz 76 Hz 74 Hz
250 (1) (1) 20 MHz 75 Hz 74 Hz
200 (1) (1) 16 MHz 75 Hz 73 Hz
160 (1) (1) 12 MHz 70 Hz 69 Hz
150 (1) (1) 12 MHz 75 Hz 73 Hz
(2)(3) (2)(3)
125 10 MHz 75 Hz 73 Hz
60 ns 75 ns
S18A-A-011-01
Frame Rate
BW /
Color
Gray