AMD’s Am79C901 HomePNA-Compliant Device
with Motorola’s MC68360, MPC860, MPC850, and
MPC8260
Application Note
AMD’s Am79C901 HomePNA-Compliant Device
with Motorola’s MC68360, MPC860, MPC850, and
MPC8260
Application Note
The following application note describes how to interface AMD’s Am79C901 HomePHY™
1/10 Mbps home networking PHY to the SCCs, FECs, and FCCs on Motorola’s integrated communication microprocessors. The user should make every effort to verify this design in the lab
before releasing it. For more information or assistance, please contact the AMD Field Applications
Engineer at your nearest AMD sales office.
Supporting the Home Phoneline Networking Alliance
(HomePNA) specification for data networking at
speeds up to 1 Mbps over existing residential phone
wiring with a Motorola QUICC™, PowerQUICC™, and
PowerQUICC II™ integrated communication microprocessors is simple when you use AMD’s Am79C901
HomePHY device.
All of the Motorola integrated communication controllers that support Ethernet or Fast Ethernet require a separate PHY (transceiver). AMD’s
HomePHY device is a HomePNA-compliant PHY
that connects easily and without any glue logic to
all of the Ethernet and Fast Ethernet ports on the
Motorola communication microprocessors.
AMD’s HomePHY device and all of the Ethernetenabled serial communication controllers (SCCs) of
the QUICC/PowerQUICC/PowerQUICC II, the Fast
Ethernet controllers (FECs) of the MPC860T/DT, and
the fast communication controllers (FCCs) of the
PowerQUICC II support the 7-wire, SIA interface
(also called serial mode or General Purpose Serial
Interface (GPSI) mode).
The remainder of this application note describes how to
connect the 7-wire, SIA interface of the HomePHY device with Motorola’s Ethernet-enabled SCCs, FECs,
and FCCs.
Because every SCC has different pin names, the actual SCC pin names in Figure 1 have been omitted.
Please refer to Table 1 for proper corresponding SCC
pin names.
The interface between the SCC and the HomePHY
transceiver has seven pins. Below is a description of
these pins and their respective connections:
1. Receive Clock – Receive Clock (RXCLK) comes
from the HomePHY device and goes into the SCC
(RCLK) and may either be the CLK1, CLK2, CLK3,
CLK4, CLK5, CLK6, CLK7, or CLK8 pin on the SCC.
Table 1.
Am79C901
Pins
TXDAT
TXEN
TXCLK
RXDAT
RXCRS
RXCLK
CLS
HomePHY Pin Connections to Various
SCC pins
SCC1
TXD1
RTS1
CLKa
RXD1
CD1
CLKa
CTS1
SCC Pins
SCC2
SCC3
TXD2
TXD3
RTS2
RTS3
CLKa
CLKb
RXD2
RXD3
CD2
CD3
CLKa
CLKb
CTS2
CTS3
SCC4
TXD4
RTS4
CLKb
RXD4
CD4
CLKb
CTS4
Note: CLKa = CLK1, CLK2, CLK3 or CLK4
CLKb = CLK5, CLK6, CLK7 or CLK8
2. Transmit Clock – Transmit Clock (TXCLK) comes
from the HomePHY device and goes into the SCC
(TCLK) and may either be the CLK, CLK1, CLK2,
CLK3, CLK4, CLK5, CLK6, CLK7, or CLK8 pin on the
SCC. However, TCLK and RCLK cannot be connected to the same CLK because the Ethernet transceiver supplies a separate clock signal between the
transmitter and receiver.
3. Receive Data – RXDAT of the HomePHY transceiver connects directly to the RXDAT pin of the
SCC.
4. Transmit Data – TXDAT of the HomePHY transceiver
connects directly to the TXD pin of the SCC.
5. Transmit Enable – The SCC’s RTS changes to
TENA when it is configured to Ethernet mode.
TENA connects to the HomePHY device’s TXEN
pin. This signal allows the SCC to signal the
HomePHY device when there is valid data on TXD.
6. Receive Enable – The SCC’s CD changes to RENA
when it is configured to Ethernet Mode. RENA connects to the HomePHY device’s CRS pin. This signal
allows the HomePHY device to signal the SCC when
Publication# 22359 Rev: C Amendment/0
Issue Date: August 1999
data has been received.
7. Collision – The SCC’s CTS changes to CLSN when it
is configured to Ethernet mode. CLSN connects to the
HomePHY device’s CLS pin. This signal indicates the
detection of a collision condition.
Note: This application note is based on engineering
information from AMD’s and Motorola’s data sheets.
Limited validation has been done to test this specific
application.
Refer to the AMD HomePHY data sheet (PID#22304),
the Motorola QUICC/PowerQUICC/PowerQUICC II
data sheets, and the Motorola MPC860T Fast Ethernet
Controller supplement for additional information.
VCC
10 K
Am79C901
HomePHY
Motorola SCC
RTSx
CLKx
TXDAT
TXD[2]
TXEN
TXCLK
RXDx
CDx
CLKx
CTSx
RXDAT
RXCRS
RXCLK
CLS
TXDx
NC
NC
NC
RX_DV
RX_ER
RXD[3:1]
Motorola SPI
SPICLK
SPIMOSI
SPIMISO
GPIO pin
SCLK
SDI
SDO
CSN
VCC
10 K
MII/GPSI
GM_MODE
PHY_SEL
PHY_AD
ISOLATE
22359C-1
Note: NC = No Connect
Figure 1.
7-Wire Interface Between SCC and
HomePHY Devices
The contents of this document are provided in connection with Advanced Micro Devices, Inc. ("AMD") products. AMD makes no representations
or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifications and product descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this publication. Except as set forth in AMD’s Standard Terms and Conditions of Sale, AMD assumes no
liability whatsoever, and disclaims any express or implied warranty, relating to its products including, but not limited to, the implied warranty of
merchantability, fitness for a particular purpose, or infringement of any intellectual property right.
AMD’s products are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into the
body, or in other applications intended to support or sustain life, or in any other application in which the failure of AMD’s product could create a
situation where personal injury, death, or severe property or environmental damage may occur. AMD reserves the right to discontinue or make
changes to its products at any time without notice.
Trademarks
Copyright © 1999 Advanced Micro Devices, Inc. All rights reserved.
AMD, the AMD logo, and combinations thereof are trademarks of Advanced Micro Devices, Inc.
HomePHY is a trademark of Advanced Micro Devices, Inc.
QUICC, PowerQUICC, and PowerQUICC II are trademarks of Motorola, Inc.
Product names used in this publication are for identification purposes only and may be trademarks of their respective companies.
2