.
PRTAD[4:0]:
These are the Port Address Assignment Pins and are used to select the Device
ID/Port ID in Clause 22/Clause 45 MDIO modes.
ST=0 (Clause 45 Mode):
If PRTAD[0] is a 0, then a PHY device is selected for XAUI/10GFC register
accesses (4.xxxxx.x).
If PRTAD[0] is a 1, then a DTE device is selected for XAUI/10GFC register
accesses (5.xxxxx.x).
PRTAD[4:1] selects the Clause 45 port address (TLK3134 must be located on
even boundaries since the lowest port address bit determines DTE/PHY, and is
used as a device address instead of port address).
ST=1 (Clause 22 Mode):
PRTAD[4:2] selects a block of four sequential Clause 22 port addresses. Each
channel is implemented as a different port address, and can be accessed by
setting the appropriate port address field within the Clause 22 MDIO transaction.
PRTAD[1:0] pins are not used in Clause 22 mode.
Channel 0 responds to port address 0 within the block of four port addresses.
Channel 1 responds to port address 1 within the block of four port addresses.
Channel 2 responds to port address 2 within the block of four port addresses.
Channel 3 responds to port address 3 within the block of four port addresses.
TLK3134 XAUI Transceiver / 4 Channel Multi-Rate Transceiver Evaluation Module (EVM) Users’ Guide
15
SLLU104A - September 2007
