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AT8901
The standard RJ45 connector has the following pin assignment:
Table 3-2:
Fast Ethernet Management (RJ45) Pin Assignment
Signal
Pin
TX+
1
TX-
2
RX+
3
N.C.
4
N.C.
5
RX-
6
N.C.
7
N.C.
8
Table 3-3:
Fast Ethernet Management (RJ45) LEDs Signification
Speed LED (yellow)
OFF
10BASE-T
ON
100BASE-TX
Status LED (green)
OFF
Link Down
ON
Link Up and no activity
BLINK
Link up and activity
SDRAM
Five 512Mbit devices, soldered directly onto the PCB, provide 256 Mbyte of SDRAM plus 64
Mbyte for ECC.
The SDRAM interface of the PPC is 32 bit wide and operated at 133 MHz.
Flash
The CPU has two 32 Mbyte Flash Memory devices, which result in 64 Mbyte total Flash mem-
ory space. The sector width is 64 Kbyte.
The Flashes are connected to the 32 bit peripheral data bus. The PowerPC 405 GPr accesses
the Flashes with CS0#. The sector containing the bootloader code is write protected. The pro-
tection can be disabled by setting jumper FWPD.
Green
8
1
Yellow
Page 3 - 4
Hardware Description
AT8901 User Guide
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