Epson Research and Development
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Vancouver Design Center
LCD Panel Options / Memory Requirements
S1D13503
Issue Date: 01/01/30
X18A-G-005-05
2.2 SRAM Size and Access Time Requirements
2.2.1 SRAM Size
Memory Size (bytes) =
i.e., 256 colors = 8 bits / pixel, therefore 1 byte (8 bits)
=
1 pixel
Therefore:
Memory size (bytes) = (320 * 240) * 8 /8
Memory size (bytes) = 76.8 K bytes.
Note
For a detailed description of the memory size requirement, see section 9.4 of the S1D13503 Hardware
Functional Specification, drawing office number X18A-A-001-xx.
2.2.2 SRAM Access Time
To support 256 color modes the S1D13503 must be configured to support a 16-bit data path into display memory (SRAM).
For 16-bit display memory interface the required SRAM access time must be:
SRAM Access time < 1/f
OSC
- 40nsec. (3.3v specification)
Therefore using a 6.0 Mhz input clock:
SRAM access time must be < 127 ns.
Note
For a detail description of the SRAM access time, see section 9.2 of the S1D13503 Hardware Functional
Specification, drawing office number X18A-A-001-xx.
3 CONCLUSIONS
To support a 320x240 256 color panel at 70 Hz refresh, you require a 6.0 MHz input clock, and 76.8K Bytes of 127nsec
access time SRAM.
Horizontalpixels
(
)
Verticallines
(
)
BitsPerPixel
(
)
×
×
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