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DP83820BVUW-AB View Datasheet(PDF) - National ->Texas Instruments

Part NameDP83820BVUW-AB National-Semiconductor
National ->Texas Instruments National-Semiconductor
Description10/100/1000 Mb/s PCI Ethernet Network Interface Controller
DP83820BVUW-AB Datasheet PDF : 87 Pages
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3.0 Functional Description (Continued)
3.7.1 VLAN Tag Handling
The Rx MAC can detect packets containing a 4-byte VLAN
tag, and remove the VLAN tag from the received packet. If
RX VLAN Tag removal is enabled, then the 4 bytes
following the source and destination addresses will be
stripped out. The VLAN status can be returned in the
Receive Descriptor Extended Status field.
3.7.2 Carrier Extension and Packet Bursting
The Receive MAC supports reception of packets with
Carrier Extension and packets transmitted using Frame
Bursting for 1000 Mb/s half-duplex operation. The first
frame in a burst must be at least one slotTime in length,
otherwise it will be considered to be a collision fragment.
3.7.3 IP Checksum Verification
The Rx MAC supports IP checksum verification. It can
validate IP checksums as well as TCP and UDP
checksums. Packets can be discarded based on detecting
checksum errors.
3.8 Physical Layer Interface
The DP83820 implements a physical layer interface that
can support all of the following:
Media Independent Interface (MII)
Gigabit Media Independent Interface (GMII)
Ten-Bit Interface (TBI)
In addition, the DP83820 implements a Management
interface as defined for MII and GMII.
3.8.1 Media Independent Interface (MII)
The DP83820 supports 10 Mb/s and 100 Mb/s physical
layer devices through the Media Independent Interface
(MII) as defined in IEEE 802.3 (clause 22). The MII
consists of a transmit data interface (TXEN, TXER,
TXD[3:0], and TXCLK), a receive data interface (RXDV,
RXER, RXD[3:0], and RXCLK), 2 status signals (CRS and
COL) and a management interface (MDC and MDIO). In
this mode of operation, both Transmit and Receive clocks
are supplied by the Phy.
3.8.2 Gigabit Media Independent Interface (GMII)
The DP83820 can support 1000 Mb/s physical layer
devices through the Gigabit Media Independent Interface
(GMII) as defined in IEEE 802.3 (clause 35). The GMII is
extended from the MII to use 8-bit data interfaces and to
operate at higher frequency. The GMII consists of a
transmit data interface (TXEN, TXER, TXD[7:0], and
GTXCLK), a receive data interface (RXDV, RXER,
RXD[7:0], and RXCLK), 2 status signals (CRS and COL)
and a management interface (MDC and MDIO). Many of
the signals are shared with the MII interface. One
significant difference is the Transmit clock (GTXCLK) is
supplied by the DP83820 instead of the Phy. The
management interface (described later) is the same in both
MII and GMII modes
3.8.3 Ten-Bit Interface (TBI)
The TBI provides a port for transmit and receive data for
interfacing to devices that support the 1000Base-X portion
of the 802.3 specification. This includes 1000Base-FX fiber
devices. The port consists of data paths that are 10-bits
wide in each direction as well as control signals. This
interface shares pins with the MII and GMII interfaces.
3.8.4 MII/GMII Management Interface
The MII/GMII management interface utilizes a
communication protocol similar to a serial EEPROM.
Signaling occurs on two signals: clock (MDC) and data
(MDIO). This protocol provides capability for addressing up
to 32 individual Physical Media Dependent (PMD) devices
which share the same serial interface, and for addressing
up to 32 16-bit read/write registers within each PMD. The
MII management protocol utilizes following frame format:
start bits (SB), opcode (OP), PMD address (PA), register
address (RA), line turnaround (LT) and data (See Figure 3-
Figure 3-9 MII Management Frame Format
2b 2b 5b
5b 2b
Note: b = bits
Start bits are defined as <01>.
Opcode bits are defined as <01> for a Write access and
<10> for a Read access.
PMD address is the device address.
Register address is address of the register within that
Line turnaround bits will be <10> for Write accesses and
will be <xx> for Read accesses. This allows time for the
MII lines to turn around.
Data is the 16 bits of data that will be written to or read
from the PMD device.
A reset frame is also provided and defined as 32
consecutive 1s (FFFF FFFFh). After power up, all MII PMD
devices must wait for a reset frame to be received prior to
participating in MII management communication.
Additionally, a reset frame may be issued at any time to
allow all connected PMDs to re-synchronize to the data
The MII/EEPROM Access Register (MEAR) is used to
provide access to the serial MII.
Refer to Section 4.2.3 for complete details of the MEAR.
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General Description
DP83820 is a single-chip 10/100/1000 Mb/s Ethernet Controller for the PCI bus. It is targeted at high
performance adapter cards and mother boards. The DP83820 fully implements the V2.2 66 MHz, 64-bit PCI bus interface for host communications with power management support. Packet descriptors and data are transferred via bus-mastering, reducing the burden on the host CPU. The DP83820 can support full duplex 10/100/1000 Mb/s transmission and reception.

— IEEE 802.3 Compliant, 66/33 Mhz, 64/32-bit PCI V2.2 MAC/BIU supports data rates from 1 Mb/s to 1000 Mb/s. This allows support for traditional 10 Mb/s Ethernet, 100 Mb/s Fast Ethernet, as well as 1000 Mb/s Gigabit Ethernet.
— Flexible, programmable Bus master - burst sizes of up to 256 dwords (1024 bytes)
— BIU compliant with PC 97 and PC 98 Hardware Design Guides, PC 99 Hardware Design Guide draft, ACPI v1.0, PCI Power Management Specification v1, OnNow Device Class Power Management Reference Specification - Network Device Class v1.0a
— Wake on LAN (WOL) support compliant with PC98, PC99, and OnNow, including directed packets, Magic Packet with SecureOn, ARP packets, pattern match packets, and Phy status change
— GMII/MII provides IEEE 802.3 standard interface to support 10/100/1000 Mb/s physical layer devices
— Ten-Bit Interface (TBI) for support of 1000BASE-X
— Virtual LAN (VLAN) and long frame support. VLAN tag insertion support for transmit packets. VLAN tag detection and removal for receive packets
— 802.3x Full duplex flow control, including automatic transmission of Pause frames based on Rx FIFO thresholds
— IPv.4 checksum task off-loading. Supports checksum generation and verification of IP, TCP, and UDP headers
— 802.1D and 802.1Q priority queueing support. Supports multiple priority queues in both transmit and receive directions.
— Extremely flexible Rx packet filtration including: single address perfect filter with MSb masking, broadcast, 2,048 entry multicast/unicast hash table, deep packet pattern matching for up to 4 unique patterns.
— Statistics gathered for support of RFC 1213 (MIB II), RFC 1398 (Ether-like MIB), IEEE 802.3 LME, reducing CPU overhead for management.
— Internal 8 KB Transmit and 32 KB Receive data FIFOs
— Supports Jumbo packets
— Serial EEPROM port with auto-load of configuration data from EEPROM at power-on
— Flash/PROM interface for remote boot support
— Full Duplex support for 10/100/1000 Mb/s data rates
— 208-pin PQFP package
— Low power CMOS design
— 3.3V powered I/Os with 5V tolerant inputs
— JTAG Boundary Scan supported

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