BU6569GVW Datasheet, PDF (12/17 Pages) Rohm – Camera Image Processor with ADPCM / MIDI / MP3 / AAC / HE-AAC Audio

BU6569GVW
Technical Note
2. Camera Module Interface Timing
2.1. System clock and camera clock
BU6569GVW external clock input (XIN) can be divided and supplied as CAMCKO clock to camera module.
The relation between data synchronization CAMCKI clock from camera and system clock SCLK must be set in order to meet the
following formula by setting of ACTSW (IDX:00D3h CLKDIV3[5:4]).
When ACTSW=1h
When ACTSW=2h
fSCLK ＝ fCAMCK1
fSCLK ≧ 2fCAMCKI
・・・ （Formula:2.1-1）
・・・ （Formula:2.1-2）
Wherein, fSCLK
BU6569GVW system clock frequency
fCAMCKI
CAMCKI terminal input clock frequency
ACTSW=0h,3h is forbidden.
(note) fCAMCKI ＞ fSCLK, 2fCAMCKI ＞ fSCLK ＞ fCAMCKI is forbidden.
2.2. Camera module interface image data timing
The timing of the camera image signal in camera I/F is shown in Figure 2.2-1.
CAMVS
CAMHS
CAMD0-
CAMD7
CAMCKI
(CKPOL='0')
CAMCKI
(CKPOL='1')
Symbol
Details
tCMS
camera data setup time
MIN. TYP. MAX. Unit
4
-
-
ns
tCMH
camera data hold time
4
-
-
ns
＊Regulation all at threshold of VDDIO21/2
tCMS tCMH
Figure 2.2-1 BU6569GVW timing (camera image data)
3. LCD direct access
・Transparent terminal timing at LCD module direct access
CSB
LCDCSB
WRB
LCDWRB
RDB
LCDRDB
tCSf1
tWRf1
A1
LCDA0
D0～D15
tAD1
LCDD0～LCDD17
tDTw1
tWRr1
tCSr1
tRDf1
tAD1
tDTr1
tRDr1
Figure 3-1 BU6569GVW timing conditions (LCD direct access）
Table 3-1 BU6569GVW timing conditions（LCD direct access）
Symbol
Details
MIN.
TYP.
MAX.
Unit
tCSf1
Delay from CSB to LCDCSB falling
4.3
-
16.0
ns
tCSr1
Delay from CSB to LCDCSB rising
2.6
-
10.5
ns
tWRf1
Delay from WRB to LCDWRB falling
4.9
-
17.1
ns
tWRr1
Delay from WRB to LCDWRB rising
2.6
-
11.4
ns
tRDf1
Delay from RDB to LCDRDB falling
5.1
-
17.2
ns
tRDr1
Delay from RDB to LCDRDB rising
2.9
-
11.6
ns
tAD1
Delay from A1 to LCDA0
3.6
-
13.3
ns
tDTw1
Delay from D0～D15 to LCDD0～LCDD17
4.5
-
14.4
ns
tDTr1
Delay from LCDD0～LCDD17 to D0～D15
＊Regulation all at threshold of VDDIO1/2
4.1
-
13.1
ns
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12/16
2009.07 - Rev.A