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AT8402
3.1.4
Ethernet Switch Controller and Memory
A PowerPC PPC405GPr-400MHz 32 bit RISC processor with 16KB D-cache, 256MB SDRAM
and 64MB Flash memory manages the Ethernet switch via 32bit / 66MHZ PCI local bus. The
CPU is accessible with UART or 10/100BASE-T Ethernet from the RTM or in-band via the GbE
switch.
3.1.4.1
PCI Interface
The PCI interface is a 32bit/66MHz system to control the on-board Broadcom BCM56305 base
interface switch. The internal PCI arbiter of the PowerPC 405GPr is used.
The switch is located at virtual PCI slot 1, IDSEL 0.
3.1.4.2
Fast Ethernet Management Interface
The internal Fast Ethernet MAC of the PowerPC 405GPr is used as a management interface.
Additionally, a Fast Ethernet PHY transceiver and a RJ45 Connector with integrated magnetics
and two LED's, located on the RTM, are used to complete the network interface.
The PHY is controlled via the MDIO interface of the PowerPC 405GPr. The MDIO address is
set to 0. The default setting of the PHY is to operate in auto-negotiation enabled mode, 10/100,
Full or Half duplex.
The Fast Ethernet Management Interface uses the following pins of the ATCA Zone 3 connec-
tor:
Table 3-5:
Fast Ethernet Pins on RTM Connector
J30 Pin
Function
E1
MNG_LAN_DA-
F2
MNG_LAN_DA+
F1
MNG_LAN_DB-
F2
MNG_LAN_DB+
3.1.4.3
RS232 Management Interface
One RS232 interface (UART0) of the PowerPC 405GPr is the serial console, the other one
(UART1) is used as programming interface for the IPMC. The serial console is routed to a min-
iature connector on the front plate. Use the provided DB9 adaptor cable to establish a connec-
tion. Additionally, the PPC serial console is routed to the Zone 3 connector so that a connection
can also be established by using an appropriate RTM like the RTM8400 (see chapter 3.2).
Hardware Description
Page 3 - 7
AT8402 User Guide
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