AM79C973BKC\W AMD (ADVANCED MICRO DEVICES), AM79C973BKC\W Datasheet - Page 268
![no-image](/images/manufacturer_photos/0/0/44/amd__advanced_micro_devices__sml.jpg)
AM79C973BKC\W
Manufacturer Part Number
AM79C973BKC\W
Description
Manufacturer
AMD (ADVANCED MICRO DEVICES)
Datasheet
1.AM79C973BKCW.pdf
(304 pages)
Specifications of AM79C973BKC\W
Operating Supply Voltage (typ)
3.3V
Operating Supply Voltage (min)
3/3.135V
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
160
Lead Free Status / RoHS Status
Not Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AM79C973BKC\WAM79C973BKCW
Manufacturer:
AMD
Quantity:
2 144
Company:
Part Number:
AM79C973BKC\WAM79C973BKCW
Manufacturer:
AMD
Quantity:
1 000
- Current page: 268 of 304
- Download datasheet (3Mb)
Media Independent Interface (MII)
APPENDIX C: MEDIA INDEPENDENT INTERFACE (MII)
Introduction
The Am79C973/Am79C975 controller fully supports
the MII according to the IEEE 802.3 standard. This
Reconciliation Sublayer interface allows a variety of
PHYs (100BASE-TX, 100BASE-FX, 100BASE-T4,
100BASE-T2, 10BASE-T, etc.) to be attached to the
Am79C973/Am79C975 MAC engine without future up-
grade problems. The MII interface is a 4-bit (nibble)
wide data path interface that runs at 25 MHz for 100-
Mbps networks or 2.5 MHz for 10-Mbps networks. The
interface consists of two independent data paths, re-
ceive (RXD(3:0)) and transmit (TXD(3:0)), control sig-
nals for each data path (RX_ER, RX_DV, TX_ER,
TX_EN), network status signals (COL, CRS), clocks
(RX_CLK, TX_CLK) for each data path, and a two-wire
management interface (MDC and MDIO). See Figure
C-77.
Note: The MII interface is disabled by default. It is en-
abled by setting PHYSELEN (BCR2 bit 13) = 1 and
PHYSEL (BCR18 bit 4, 3) =10.
Enabling the MII interface automatically disables the in-
ternal 10/100 PHY and the Expansion Bus. When in
this mode, the Am79C973/Am79C975 MII interface
pins are multiplexed with the expansion bus pins. Refer
APPENDIX C
Am79C973/Am79C975
Figure 77. Media Independent Interface
Am79C973/Am79C975
4
4
to the connection diagram showing how the pins are
multiplexed.
MII Transmit Interface
The MII transmit clock is generated by the external
PHY and is sent to the Am79C973/Am79C975 control-
ler on the TX_CLK input pin. The clock can run at 25
MHz or 2.5 MHz, depending on the speed of the net-
work to which the external PHY is attached. The data
is a nibble-wide (4 bits) data path, TXD(3:0), from the
Am79C973/Am79C975 controller to the external PHY
and is synchronous to the rising edge of TX_CLK. The
transmit process star ts when the Am79C973/
Am79C975 controller asserts the TX_EN, which indi-
cates to the external PHY that the data on TXD(3:0) is
valid.
Normally, unrecoverable errors are signaled through
the MII to the external PHY with the TX_ER output pin.
The external PHY will respond to this error by generat-
ing a TX coding error on the current transmitted frame.
The Am79C973/Am79C975 controller does not use
this method of signaling errors on the transmit side.
The Am79C973/Am79C975 controller will invert the
FCS on the last byte generating an invalid FCS. The
TX_ER pin is reserved for future use and is actively
driven to 0.
RXD(3:0)
RX_DV
RX_ER
RX_CLK
CRS
COL
TXD(3:0)
TX_EN
TX_CLK
MDC
MDIO
Receive Signals
Network Status Signals
Management Port Signals
Transmit Signals
21510C-77
268
Related parts for AM79C973BKC\W
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![AMD-751AC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
AMD-751ACAMD-751-TM System Controller Revision Guide
Manufacturer:
Advanced Micro Devices
Datasheet:
![AMD-751](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
AMD-751AMD-751-TM System Controller Revision Guide
Manufacturer:
Advanced Micro Devices
Datasheet:
![AMD-X5-133SFZ](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
AMD-X5-133SFZAm5X86? Microprocessor Family
Manufacturer:
Advanced Micro Devices
Datasheet:
![AMD-8131BLC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Hyper Transport PCI-X Tunnel
Manufacturer:
Advanced Micro Devices
Datasheet:
![AMD-8111AC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
HyperTransport I/O Hub
Manufacturer:
Advanced Micro Devices
Datasheet:
![AMD-640AC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
System Controller
Manufacturer:
Advanced Micro Devices
Datasheet:
![AMD-K6](/images/no-image3.png)
Part Number:
Description:
AMD-K6 Processor
Manufacturer:
AMD [Advanced Micro Devices]
Datasheet:
![AMD-K6-2E/400AFR](/images/no-image3.png)
Part Number:
Description:
AMD-K6™-2E Embedded Processor
Manufacturer:
AMD [Advanced Micro Devices]
Datasheet:
![AMD-8132BLCT](/images/manufacturer_photos/0/0/44/amd__advanced_micro_devices__tmb.jpg)
Part Number:
Description:
Manufacturer:
AMD (ADVANCED MICRO DEVICES)
Datasheet:
![AMD-K6-IIIE+550ACR](/images/manufacturer_photos/0/0/44/amd__advanced_micro_devices__tmb.jpg)
Part Number:
Description:
Manufacturer:
AMD (ADVANCED MICRO DEVICES)
Datasheet:
![AMD-766AC](/images/no-image3.png)
Part Number:
Description:
Peripheral Bus Controller
Manufacturer:
AMD [Advanced Micro Devices]
Datasheet: