DMAC
Media Access Controller
ver 2.07
OVERVIEW
The DMAC is hardware implementation of
media access control protocol defined by the
IEEE standard. DMAC in cooperation with
external PHY device enables network func-
tionality in design. It is capable of transmitting
and receiving Ethernet frames to and from
the network. Half and full duplex modes are
supported, as well 10 and 100 Mbit/s speed.
The core is able to work with wide range of
processors: 8, 16 and 32 bit data bus, with
little or big endian byte order format. Design
is technology independent and thus can be
implemented in variety of process technolo-
gies. This core strictly conforms to IEEE
802.3 standard.
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Supports full and half duplex operation at
10 Mbps or 100 Mbps
CRC-32 algorithm calculates the FCS
nibble at a time, automatic FCS genera-
tion and checking, able to capture frames
with CRC errors if required
Lite design, small gate count and fast
operation
Programmable or fixed MAC address
Promiscuous mode support
Dynamic PHY configuration by MII man-
agement interface
Receive FIFO able to store many mes-
sages at a time
Allows operation from a wide range of
input bus clock frequencies
Fully synthesizable
Static synchronous design with positive
edge clocking and synchronous reset
No internal tri-states
Scan test ready
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KEY FEATURES
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Conforms to IEEE 802.3-2002 specifica-
tion
8/16/32-bit CPU slave interface with little
or big endianess
Simple interface allows easy connection
to CPU
Narrow address bus with indirect I/O in-
terface to the transmit and receive data
dual port memories
Supports 10BASE-T and 100BASE-
TX/FX IEEE 802.3 compliant MII PHYs
Media Independent Interface (MII) for
connection to external 10/100 Mbps PHY
transceivers
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APPLICATIONS
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Embedded microprocessor boards
Networking devices (Network Interface
Cards, routers, switches)
Communications systems
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are trademarks of their respective owners.
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