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| 型号： | MAX9257GTL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/52页 |
| 文件大小： | 0K |
| 描述： | IC SER/DESER PROG 40-TQFN |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 串行器/解串器 |
| 数据速率： | 840Mbps |
| 输入类型： | 串行 |
| 输出类型： | LVDS |
| 输入数： | 16 |
| 输出数： | 1 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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counter bits REG3[3:0] that increment once every ETO
clock period. Write to REG3[3:0] to determine the
counter end time. The ETO counter counts to the pro-
grammed ETOCNT + 1. Any ECU activity resets the
ETO timer. When the ECU stops transmitting data for
the ETO timeout period, the control channel closes
(Figure 23).
For example:
If the pixel clock frequency is set to 16MHz, ETODIV is
set to 1010 (ETODIV = 1024), and ETOCNT is set to
1001 (ETOCNT = 9), the ETO timer counts with the
15.625kHz ETO clock (16MHz/1024) internally until it
reaches 10 and timer expires. The tETO is equal to tT x
1024 x 10 = 640s.
The default value for ETODIV is 1024 while the default
value for ETOCNT is 0. That means the ETO timeout
period is equal to 1,024 pixel clock cycles.
Closing the Control Channel
After the MAX9257 detects the active VSYNC edge, it
sends three synchronization words. Once the MAX9258
sees the active VSYNC transition and detects three syn-
chronization words, it enters the control channel phase
and CCEN goes high. There is a brief delay of T1
between the VSYNC transition and CCEN transitioning
high. The ECU is allowed to communicate when CCEN
is high.
If the ECU does not communicate while CCEN is high
(Figure 22), the link remains silent and STO starts
counting towards its preset timeout counter value. If
STO times out (T2), CCEN transitions low and the con-
trol channel closes.
If the ECU communicates while CCEN is high and
before STO expires (Figure 23), the STO timer is turned
off and ETO timer is enabled. The ETO counter (ETOC-
NT+1) is reset to 0 whenever activity from ECU (base
mode) or ECU and Camera (bypass mode) is detected.
As long as there is activity from ECU (base mode) or
ECU and Camera (bypass mode) on the link, the chan-
nel does not close and the ETO counter resets. After
the ECU (base mode) or ECU and Camera (bypass
mode) ceases link activity, ETO times out (T4), CCEN
transitions low, and the control channel closes.
Another way to close the control channel in base mode
is for the ECU to send an end frame (EF) to close the
control channel without waiting for ETO to time out.
Whenever EF is received by both the MAX9257/
MAX9258, control channel closes immediately and
CCEN goes low. A synchronization frame must precede
EF. End frame cannot be used in bypass mode. The
control channel must close by EF to report errors back
to the ECU.
t
f
ETODIV
ETOCNT
ETO
CLK
=
××
+
1
()
MAX9257/MAX9258
______________________________________________________________________________________
29
Fully Programmable Serializer/Deserializer
with UART/I2C Control Channel
VIDEO
HSK
VSYNC_IN
SDI/O
±
CCEN
T1
T4 (BASE MODE)
T5
TX
RX
DOUT_
FROZEN
T1 = TIME TO ENTER CONTROL CHANNEL
T4 = ETO TIMEOUT PERIOD
T5 = CONTROL CHANNEL EXIT TIME DUE TO ETO
HSK = HANDSHAKING BETWEEN MAX9257 AND MAX9258
ECU
ACTIVITY
T4 (BYPASS MODE)
Figure 23. Control Channel Closing Due to ETO Timeout
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9258 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Fully Programmable Serializer/Deserializer with UART/I2C Control Channel |
| MAX9258A | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Fully Programmable Serializer/Deserializer with UART/I2C Control Channel |
| MAX9258AEVKIT# | 功能描述:界面开发工具 MAX9257A/58A Eval Kit RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| MAX9258AGCM | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Fully Programmable Serializer/Deserializer with UART/I2C Control Channel |
| MAX9258AGCM/V+ | 功能描述:串行器/解串器 - Serdes Prog Serializer / Deserializer RoHS:否 制造商:Texas Instruments 类型:Deserializer 数据速率:1.485 Gbit/s 输入类型:ECL/LVDS 输出类型:LVCMOS 输入端数量:1 输出端数量:20 工作电源电压:2.375 V to 2.625 V 工作温度范围:0 C to + 70 C 封装 / 箱体:TQFP-64 |
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