参数资料
型号: ST72T734J6B1
厂商: 意法半导体
元件分类: ADC
英文描述: 8-BIT USB MCU FOR MONITORS, WITH UP TO 60K OTP, 1K RAM, ADC, TIMER, SYNC, TMU, PWM/BRM, H/W DDC & I2C
中文描述: 8位USB单片机的显示器,高达60K章检察官办公室,每1000内存,模数转换器,定时器,同步,材质单元,脉宽调制/的BRM,的H / W DDC的
文件页数: 4/144页
文件大小: 1280K
代理商: ST72T734J6B1
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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