a-Si TFT LCD Single Chip Driver
240RGBx320 Resolution and 262K color
ILI9325
10.GRAM Address Map & Read/Write
ILI9325 has an internal graphics RAM (GRAM) of 87,120 bytes to store the display data and one pixel is
constructed of 18 bits. The GRAM can be accessed through the i80 system, SPI and RGB interfaces.
i80 18-/16-bit System Bus Interface Timing
(a) Write to GRAM
nCS
RS
nRD
nWR
Write “0022h” to
index register
Write GRAM “data”
Nth pixel
Write GRAM “data”
(N+1)th pixel
Write GRAM “data”
(N+2)th pixel
Write GRAM “data”
(N+3)th pixel
DB[17:0]
(b) Read from GRAM
nCS
RS
nRD
nWR
Write “0022h” to
index register
Dummy
Read
1st Read “data”
Nth pixel
2nd Read “data”
(N+1)th pixel
3rd Read “data”
(N+2)th pixel
DB[17:0]
i80 9-/8-bit System Bus Interface Timing
(a) Write to GRAM
nCS
RS
nRD
nWR
1st write
high byte
1st write
low byte
2nd write
high byte
2nd write
low byte
3rd write
high byte
3rd write
low byte
“00h”
“22h”
DB[17:9]
Nth pixel
(N+1)th pixel
(N+2)th pixel
(b) Read from GRAM
nCS
RS
nRD
nWR
Dummy
Read 1
Dummy
Read 2
1st read
high byte
1st read
low byte
2nd read
high byte
2nd read
low byte
“00h”
“22h”
DB[17:9]
Nth pixel
(N+1)th pixel
Figure33 GRAM Read/Write Timing of i80-System Interface
The information contained herein is the exclusive property of ILI Technology Corp. and shall not be distributed,
reproduced, or disclosed in whole or in part without prior written permission of ILI Technology Corp.
Page 83 of 111
Version: 0.35
ETC [ ETC ]
