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 2