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参数资料
| 型号： | MAX9257AGCM/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/53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 30
MAX9257A/MAX9258A
Fully Programmable Serializer/Deserializer
with UART/I2C Control Channel
Base Mode and Bypass Mode (Basics)
In the control channel phase, there are two modes: base
and bypass. In base mode, ECU always communicates
using the MAX9257A/MAX9258A UART protocol and
communication with a peripheral device is performed
in I2C by the MAX9257A. Packets not addressed to
the MAX9257A or the MAX9258A get converted to I2C
and passed to the peripheral device. Similarly, I2C
packets from the peripheral device get converted to
UART packets in the reverse direction. ECU can disable
communication to the peripheral device by writing a 0 to
INTEN (REG8[6] in the MAX9257A and REG7[6] in the
MAX9258A). Base mode is the default mode. Bypass
mode is entered by writing a 0 to INTMODE and 1 to
INTEN (Table 23). Bypass mode is exited if there is no
activity from ECU in the control channel for the duration of
CTO. When CTO times out, INTEN reverts back to 0 and
the devices revert back to base mode. To permanently
stay in bypass mode, ECU can lock the CTO timer or
program CTO to be longer than ETO and STO.
Timers
The devices feature three different timers. The start time-
out (STO) and end timeout (ETO) control the duration of
the control channel. The come-back timeout (CTO) con-
trols the duration of bypass mode.
STO Timer
The STO (start timeout) timer closes the control chan-
nel if the ECU does not start using the control channel
within the STO timeout period. The STO timer is config-
ured by register REG2 for both the MAX9257A and the
MAX9258A. The four bits of REG2[7:4] select the divide
ratio (STODIV) for the STO clock as a function of the pixel
clock (Table 24). The timeout period is determined by
counter bits REG2[3:0] that increment once every STO
clock period. Write to REG2[3:0] to determine the counter
end time. The STO counter counts to the programmed
STOCNT + 1. The ECU must begin communicating
before STO times out, otherwise, the control channel
closes (Figure 22). The STO timeout period is given by:
STO
CLK
1
t
STODIV (STOCNT 1)
f
=
×
+
For example:
If the pixel clock frequency is set to 16MHz, STODIV is
set to 1010 (STODIV = 1024), and STOCNT is set to 1001
(STOCNT = 9), the STO timer counts with 15.625kHz STO
clock (16MHz/1024) internally until it reaches 10 and
timer expires. The tSTO is equal to tT x 1024 x 10 = 640Fs.
The default value for STODIV is 1024 while the default
value for STOCNT is 0. That means the STO timeout
period is equal 1024 pixel clock cycles. Activity from the
ECU on the control channel shuts off the STO timer and
starts the ETO timer.
Table 23. Selection of Base Mode or
Bypass Mode
Table 24. STO Clock Divide Ratio
INTEN
MAX9257A REG8[6],
MAX9258A REG7[6]
INTMODE
MAX9257A REG8[7],
MAX9258A REG7[7]
MODE
0
X
Base mode, com-
munication
with peripheral is
not enabled
1
Base mode,
communication
with peripheral is
enabled (I2C)
1
0
Bypass mode,
communication
with MAX9257A/
MAX9258A is not
enabled, commu-
nication
with peripheral is
enabled (UART)
REG2[7:4]
STODIV
00XX
16
0100
16
0101
32
0110
64
0111
128
1000
256
1001
512
1010
1024
1011
2048
1100
4096
1101
8192
1110
16,384
1111
32,768
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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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