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P5040/P5020 Reference Design Board User Guide, Rev. 0
Freescale Semiconductor
27
Architecture
,” for I
2
C implementation information.
5.1.15
EM1 and EM2 Management Buses
The P5040/P5020 has the following types of buses:
•
SGMII and RGMII PHY management
•
XAUI PHY management
Because one set of buses must span across multiple devices on the reference board, multiplexers are used
to route from the P5040/P5020 to each SGMII and RGMII PHYs while EMI2_MDIO bus is routed to
XAUI PHY. See
,” for details on using GPIO to select EMI1 device.
PHY management bus control is summarized in this table.
5.1.16
Enhanced Local Bus (eLBC) Interface
The eLBC has the following features:
•
Supports GPCM, NAND FCM, and UPM.
•
Only operates in 3.3V IO voltage.
•
Clients include: PromJet Emulator, FPGA, NOR and NAND FLASH.
Table 15. P5040/P5020 PHY Management Bus Map for EMI1 on Reference Board
Bus
FPGA_S1S0
Device
EMI1
00
On board RGMI PHYI
EMI1
01
SGMII