PRELIMINARY
MPC8260TCOM User’s Manual
FUNCTIONAL DESCRIPTION
15
3•4
MPC8260ADS
The MPC8260ADS is meant to serve as a platform for S/W and H/W development around the MPC8260.
Using its on board resources and its associated debugger, a developer is able to load his code, run it, set
breakpoints, display memory and registers and connect his own proprietary H/W via the CPM expansion
connectors (P1 and P2 on the MPC8260TCOM), to be incorporated to a desired system with the MPC8260
device.
3•5
Ethernet. - 100BASE-TX and 10BASE-
T
Two Fast-Ethernet modules used FCC1 (FE_1) and FCC3 (FE_2) are on this board, together with the Fast
Ethernet on the ADS board it will be possible to run 3 Fast Ethernet modules at the same time or it is
possible to disable each one of them to let the user to use the FCC’s for other uses. The disable can be
done by the MDIO bus. The device that use to perform the transceiver operation is the Level One LXT970.
The LXT970 is an IEEE 802.3 compliant 10/100Mbps Fast Ethernet PHY Transceiver that directly supports
both 100BASE-TX and 10BASE-T applications. Provides a Media Independent Interface (MII) for easy
attachment to 10/100 Media Access Controller (MAC)s. The LXT970 supports full-duplex operation at 10
and 100 Mbps. Its operating condition can be set using autonegotiation panel detection or manual control.
The configuration of the LXT970 can be controlled via the MII serial port (MDIO Interface). This interface
allows upper-layer devices to control or monitor the LXT970. The LXT970 can also be controlled via
external pin settings (Hardware Control Interface). This option is not supported on the 8260TCOM.
The LXT970 is connected to the MPC8260 via the FCC1 and FCC3 that performs MII interface through
the I/O ports.
3•6
DS3 (T3).
Two DS3 modules are on this board; they use the TDMA1 (FCC2) and TDMA2 (FCC3). Each one of the
DS3 module is composed of Framer and Line Interface Unit. The DS3 Framer is TRAN-SWITCH TXC-
03401. It is a 5V device. The MPC8260 device is a 3.3V device. That is why a 5V to 3.3V translator is
needed in the output direction from the framer, to bridge between the DS3F, (5V) to the MPC8260 (3.3V)
The device used is a 74LXT541.
The DS3F is designed for DS3 framer applications in which broadband payloads are mapped into the
44.736 Mbit/s DS3 frame format. The payload interface is nibble-parallel format.
The Line Interface Unit is a TRAN-SWITCH TXC-20153G, this LIU is a module which include the
transformer and the TRAN SWITCH TXC-02020 LIU device. It connected from one side to the DS3F and
from the other side to BNC connector. It is a 5V device.
Each one of the DS3 module can be isolated by a logic control to let the user to use FCC2 and FCC3 for
other purposes.
The DS3 Line Interface Module (DS3LIM-SN) is a complete and compact full duplex analog line to digital
terminal interface. It converts B3ZS - encoded line signals, in either DS3 asynchronous, to and from NRZ
data and clock signals, in addition to the synchronous signal option.
In order to enable DS3_1, PD4 (T1_1) & PD18 (T1_7) & PD19 (T1_8) should be high -’1’ and then drive
PD25 to be low -’0’. In order to enable DS3_2, PD6 (T1_3) & PD7 (T1_4) & PD8 (T1_5) & PD19 (T1_8)
should be high -’1’ and then drive PA4 to be low -’0’. Each one of the DS3 module has a led to light when
this DS3 module is enable, LD13 for DS3_2 and LD16 for DS3_1. Each DS3 modules also has a Frame
Error and Receive signal loss leds.
Each one of the DS3 module have two loopback capabilities for testing transmit and receive loopback via
the loopback controls block of the TXC-20153G.
Transmit - to - Receive loopback connects the data path from the transmit I/O control block output to the
receive I/O control block input, and disable the external receiver input.
Transmit - to - Receive loopback is activated by placing a low on the TR signal pin.
Receive - to Transmit loopback connects the receive data output path to the transmit input circuits and
disable the NRZ transmit input.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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