參數(shù)資料
型號(hào): ST72T774S9T1
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP44
封裝: TQFP-44
文件頁數(shù): 4/144頁
文件大小: 1280K
代理商: ST72T774S9T1
ST72774/ST727754/ST72734
101/144
DDC INTERFACE (Cont’d)
Figure 60. Mapping of DDC1 data structure
DDC2B Transition Mode: This mode avoids the
display switching to DDC2B mode if spurious
noise is detected on SCL while the host is in DDC1
mode.
When the DDC1/2B interface is in DDC1 mode
and detects a falling edge on SCL, it enters the
transition state (see Figure 61).
If a valid I2C sequence (START followed by a valid
Device Address for CF0 =0 (see Table 25)) is not
received within either 128 Vsync pulses or a period
of approximately 2 seconds, then the interface will
revert to DDC1 mode at the EDID start address.
If the interface decodes a valid DDC2B Device
Address, it will lock into DDC2B mode and
subsequently disregard VSYNCI.
When in transition mode, the Vsync pulse counter
or the 2-sec. timeout counter is reset by any
activity on the SCL line.
Figure 61. Transition Mode Waveforms
AHR
ALR
0
7
8
15
Addr Pointer
0000h
FFFFh
256 * AHR
ALR
128-byte Data
25
6
byt
es
Structure
MSB of ALR is always ‘0’
AHR[7:1]
ALR
0
7
8
15
Addr Pointer
0000h
FFFFh
512 * AHR[7:1]
256
bytes
9
1
ALR
128-byte Data
25
6
byte
s
Structure
DDC v2 mode: CF[1:0] bits = 00b
DDC v2 + P&D mode: CF[1:0] bits = 10b
Reserved
- LSB of AHR is ignored and taken as ‘1’
- MSB of ALR is always ‘0’
Notes:
Note:
6
0
Vsync
SDA
SCL
ALR
00h
DDC1 mode
Transition mode
01h
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