Mfp Slew Rate - Analog Devices MAX96752 User Manual

MFP0 MFP1
TX_ID = 0 RX_ID = 0
(GPIO0) (GPIO1)
GMSL LINK
SERIALIZER DESERIALIZER
Figure 26. GPIO Forwarding Programming Example
#DES I2C Address=0x90
#SER I2C Address=0x80
#Setup SER MFP0 Pin
#1M ohm Pull-Up, Open Drain
0x80,0x0200,0x83
0x80,0x0201,0x40
0x80,0x0202,0x40
#Setup DES MFP0 Pin
#1M ohm Pull-Up, Open Drain
0x90,0x0203,0x84
0x90,0x0204,0x40
0x90,0x0205,0x40

MFP Slew Rate

The MFPs have configurable rise and fall times (slew rate). This parameter may be referred to as the I/O "speed
(control)," "slew (rate)," or "edge rate" in register control bit names. Note that the MFP slew rate cannot be
adjusted independently on a per-pin basis. MFPs are divided into separate speed groups; the slew rate adjustment
register contains a bitfield for each group that configures the rise and fall time to all pins in the group. Refer to the
data sheet for the relevant register map and MFP speed grouping details.
The MFP edge transitions must be fast enough to meet the application's requirement; however, the high-speed I/O
of the GMSL link and video protocols (e.g., MIPI) are sensitive to coupling and crosstalk from MFP transitions. Take
care at a system level to prevent high edge rates and high frequencies on the MFP inputs close to these I/O. In
general, the MFP pins should be configured to the slowest slew rate that allows proper function to mitigate I/O
interference.
Note: Coupling refers to both inductive and capacitive coupling. Higher V supply values increase the MFP edge
DDIO
rate and energy. This can introduce additional noise into the high-speed I/O.
High MFP slew rates, especially combined with high toggle frequencies, near the GMSL or high-speed video pins
may adversely affect performance of the data path, including CRC errors, 9b10b code or disparity errors, reduction
of link margin, and/or loss of link lock.
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