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When transitioning from TSB12LV23 to TSB12LV26, what should be noted?
Problem:
When transitioning from TSB12LV23 to TSB12LV26, what should be noted?
Solution:
The TSB12LV26 achieves significant power savings over the TSB12LV23 by operating with a 1.8V core voltage.
This change did require some minor changes to the pin out. When transitioning from the TSB12LV23 the following differences should be noted:
1. Pins 42 and 100 have been changed from GND terminals to 1.8V terminals denoted as REG18. These terminals provide a means to provide local bypass for the 1.8V core voltage. A 0.01 uF bypass capacitors is recommended on each of the REG18 terminals. NOTE: If implementing a board that may use either the TSB12LV23 or TSB12LV26, option pads should be provided to accept the 0.01 uF capacitor for the TSB12LV26 or a zero Ohm short for the TSB12LV23.
2. Pin 79 has been changed from the ISOLATED# input to REG_EN#. The REG_EN# input must be pulled low to enable the internal 1.8V voltage regulator for normal device operation.
3. The integrated bus holders on the phy-link interface are always enabled. On the TSB12LV23 the bus holders were enabled when the ISOLATED# input was asserted low. NOTE: If implementing a board that may use either the TSB12LV23 or TSB12LV26, terminal 77 can be implemented with a pull-up or pull-down option. However, the TSB12LV23 can be operated with the ISOLATED# input pulled down with the only effect being a slight increase in leakage current due to the bus holders.
4. The GLOBAL_SWAP bit in the OHCI Control register (PCI offset 0x40) is not loaded from the serial EEPROM.
5. The TSB12LV26 does not support CardBus buffers and should not be used for PC Card applications. The CARDBUS# input (pin 77) has been removed, and this terminal provides the CYCLEOUT functionality. Since the CARDBUS# input has been removed, the CIS Base Address register (PCI offset 0x18) and CardBus CIS Pointer register (PCI offset 0x28) are no longer supported.
6. The device ID in the Device ID register (PCI offset 0x02) has been changed to 0x8020.
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