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| 型号： | MAX9257AGCM/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 30/53页 |
| 文件大小： | 0K |
| 描述： | IC SERDE PROG UART/I2C 48TQFP |
| 标准包装： | 250 |
| 系列： | * |
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Maxim Integrated Products 36
MAX9257A/MAX9258A
Fully Programmable Serializer/Deserializer
with UART/I2C Control Channel
Once serialization is enabled, the programming of regis-
ters (including the control channel overhead time) must
be completed within the vertical blanking time to avoid
loss of video data. VSYNC can deassert while control
channel remains open after eight pixel clock cycles.
The control channel phase begins on the transition of
the programmed active edge of VSYNC_IN. In video
applications, the VSYNC signal of the peripheral device
is connected to VSYNC_IN on the MAX9257A. In other
applications, a different signal can be used to trigger
the control channel phase. When the devices detect the
VSYNC_IN transition, the LVDS video phase disables and
the control channel phase is enabled.
The control channel operates in two modes: base and
bypass. In base mode, the ECU issues UART com-
mands in a specified format to program the MAX9257A/
MAX9258A registers. GPIO on the MAX9257A are also
programmed in base mode. UART commands are trans-
lated to I2C and output to peripheral devices connected
to the MAX9257A when not addressed to either the
MAX9257A or the MAX9258A.
In bypass mode, programming of the MAX9257A/
MAX9258A registers are temporarily or permanent-
ly blocked depending on the programmed value of
CTO. Blocking prevents unintentional programming of
the MAX9257A/MAX9258A registers when the ECU
communicates with the peripheral using a UART protocol
different than the one specified to program the devices.
When the control channel is open, the MAX9258A con-
tinues outputting the pixel clock while HSYNC and video
data are held at the last value. If spread is enabled on the
MAX9258A, the pixel clock is spread.
Control Channel Overhead
Control channel overhead consists of lock frame, short
synchronization sequence, and error frame. The lock
frame is transmitted between the MAX9257A and the
MAX9258A without action by the ECU. The error frame
is only sent in response to end frame. When MAX9257A
spread spectrum is enabled, the control channel is
entered after spread reaches center frequency. The over-
head from VSYNC falling edge to control channel enable
accounts for a maximum of 1400 pixel clock cycles.
Base Mode (Details)
Base mode allows the ECU to communicate with the
devices in UART and a peripheral device in I2C. UART
programming of the peripheral device is not possible in
base mode. UART packets from the ECU need to follow
a certain protocol to program the MAX9257A and the
MAX9258A (Figures 28 and 29). Packets not addressed
to the MAX9257A/MAX9258A get converted to I2C by
the MAX9257A and pass to the peripheral device. The
MAX9257A receives I2C packets from the peripheral
device and converts them to UART packets to send back
to the ECU. To disable communication to the peripheral
device, write a 0 to INTEN (REG8[6] in the MAX9257A
and REG7[6] in the MAX9258A).
In base mode, the STO/ETO timers and the EF command
are used to control the duration of the control channel.
STO and ETO count up and expire when they reach their
programmed value. STO and ETO are not enabled at
the same time. STO is enabled after CCEN goes high. If
there is activity from the ECU before STO times out, STO
is disabled and ETO is enabled. The ECU must begin
a transaction within an STO timeout or else the channel
closes. The ECU can close the channel by allowing ETO
to time-out. Activity from the ECU resets the ETO timer.
Another way to close the control channel is by send-
ing an end frame (EF). EF closes the channel within 2
to 3 bit times after being received by the MAX9257A/
MAX9258A. The default value of EF is 0xFF, but can be
programmed to any other value besides the MAX9257A
and the MAX9258A device addresses. The control chan-
nel must be closed with EF for control channel errors to
be reported.
Program STO to be longer than the time the ECU takes to
respond to opening of channel. Program ETO to be lon-
ger than the time the ECU pauses between transactions.
As long as the ECU performs transactions, ETO is reset
and the channel stays open.
The ECU must wait 14 or more bit times before address-
ing another device during the same control channel
session. Failure to wait 14 bit times may result in the
packet boundary not being reset. Internal handshaking
operations are automatically performed after the channel
is closed and before the video phase begins.
UART-to-I2C Converter
The UART-to-I2C converter accepts UART read or write
packets issued by the ECU and converts them to an I2C
master protocol when in base mode. A slave can use an
ACK or NACK to indicate a busy or wait state, but cannot
hold SCL low to indicate a wait state. Multiple slaves are
supported. The UART-to-I2C conversion delay is less than
22 UART bit times and needs to be taken into account
when setting the ETO and STO timeout periods for read
commands. UART-to-I2C converter converts standard
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9257AGCV | 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 |
| MAX9257AGTL | 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 |
| MAX9257AGTL/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 |
| MAX9257AGTL/V+T | 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 |
| MAX9257AGTL+ | 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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