Migration from 8895MQRQFMQMLMLU to 8895MQXRQXFQXMLMLUB

Application Note (Migration Document)
KSZ8895MQ/RQ/FMQ/ML/MLU To
KSZ8895MQX/RQX/FQX/ML/MLUB
Introduction
This application note summarizes the differences between the KSZ8895MQ/RQ/FMQ/ML/MLU and
KSZ8895MQX/RQX/FQX/ML/MLUB devices. The KSZ8895MQX/RQX/FQX/ML/MLUB devices provide a
functional drop in replacement to KSZ8895MQ/RQ/FMQ/ML/MLU devices. Specific part numbers for the pincompatible replacements are shown in Table 1 below. Table 2 shows major commonality between two families.
Table 3 shows the differences between the two product families.
Part Numbers for the Pin-Compatible Replacements (Table 1)
Discontinued Devices
Replacement Devices
KSZ8895FMQ
KSZ8895FQXCA
KSZ8895FMQI
KSZ8895FQXIA
KSZ8895MQ
KSZ8895MQXCA
KSZ8895MQI
KSZ8895MQXIA
KSZ8895RQ
KSZ8895RQXCA
KSZ8895RQI
KSZ8895RQXIA
KSZ8895ML (Rev A3)
KSZ8895ML (Rev B2)
KSZ8895MLU (Rev A3)
KSZ8895MLUB
SPNU801112 (KSZ8895MLU Rev A4)
KSZ8895MLUB
Summary of major commonality between the two product families (Table 2):
March 2014
KSZ8895MQ/RQ/FMQ/ML/MLU
KSZ8895MQX/RQX/FQX/ML/MLUB
Pins Configurations
Same
Strap-in Pins Functions
Same
Features
Supports existing features plus new features
Package
Same
MII/RMII interface
Same
VDDC, VDDIO, VDDAT Voltage
Same
Registers set
Same, except LinkMD & Fiber versions. For
details, please see below Table 3.
Application Note
Summary of differences between the two product families (Table 3)
Descriptions
KSZ8895MQ/RQ/FMQ/ML/MLU
KSZ8895MQX/RQX/FQX/ML/MLUB
Process Technology
0.13um
0.11um
Identification
Register 137 (0x89) bits [7:4]=0x1 to 0x3
for 0.13um silicon
Register 137 (0x89):
Bits [7:4] = 0x4 for MQX/RQX/FQX
Rev. A2 and ML/MLUB Rev.B2.
Bits [7:4] = 0x5 for MQX/RQX/FQX
Rev. A3 and ML/MLUB Rev.B3.
LinkMD Cable Diagnostic
No
Yes
Note: Add the Port PHY Special
Control/Status registers (0x1A to
0x5A) and Port LinkMD Result
registers (0x1B to 0x5B).
Digital I/O current strength
4/8/12/16mA in Register 132 bits [7:6]
4/8/10/14mA in Register 132 bits [7:6]
HBM ESD Rating
4KV
5KV
Internal I/O Pull-Up Resistor
1.8V VDDIO: 100Kohm
1.8V VDDIO: 99Kohm
2.5V VDDIO: 59Kohm
2.5V VDDIO: 61Kohm
3.3V VDDIO: 43Kohm
3.3V VDDIO: 45Kohm
1.8V VDDIO: 100Kohm
1.8V VDDIO: 99Kohm
2.5V VDDIO: 60Kohm
2.5V VDDIO: 59Kohm
3.3V VDDIO: 43Kohm
3.3V VDDIO: 43Kohm
Pin 126 voltage enable the internal 1.2V
LDO controller threshold
voltage >0.58V.
Pin 126 voltage enable the internal
1.2V LDO controller threshold
voltage >1V.
Recommend using resistor divider on
pin 126 and using 3.3K-4.3K pull-up and
1K pull-down for this resistor divider.
Recommend using resistor divider on
pin 126 and using 4K pull-up and 2K
pull-down for this resistor divider.
KSZ8895FMQ supports 3 copper ports
and 2 fiber ports
KSZ8895FQX supports 4 copper
ports and 1 fiber ports as default
KSZ8895FMQ need to set the Register
165 (0xa5) bit [5] = 0
KSZ8895FQX doesn’t need to set the
Register 165 (0xa5) bit [5] (default)
KSZ8895FMQ port 3 and port 4 support
fiber mode only.
KSZ8895FQX port 4 is fiber mode
only. Port 3 default is copper mode
that can be configured to fiber mode
by setting Register 239 bit [7] = 1.
Internal I/O Pull-Down
Resistor
Using Internal 1.2V LDO
Controller and an external
MOSFET
Fiber Mode
Conclusion
For the detail device information, please refer to the relevant datasheets at www.micrel.com
March 2014
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