Instruction Manual

AT8901M Hardware Description

Page 3 - 4 AT8901M User Guide

The standard RJ45 connector has the following pin assignment:

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.

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

Green

Yellow