DP83934AVQB National Semiconductor, DP83934AVQB Datasheet - Page 23

• Manufacturer Part Number: DP83934AVQB
• Description: IC CTRLR ORIENT NETWORK 160PLCC
• Manufacturer: National Semiconductor

Specifications of DP83934AVQB

• Controller Type: Network Interface Controller (NIC)
• Interface: Twisted Pair
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 140mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 160-MQFP, 160-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *DP83934AVQB

4 0 Transmit Receive IEEE 802 3 Frame Format
ets from reaching a node There are three types of address
formats supported by the SONIC-T Physical Multicast and
Broadcast
Physical Address The physical address is a unique ad-
dress that corresponds only to a single node All physical
addresses have the LSB of the first byte of the address set
to ‘‘0’’ These addresses are compared to the internally
stored CAM (Content Addressable Memory) address en-
tries All bits in the destination address must match an entry
in the CAM in order for the SONIC-T to accept the packet
Multicast Address Multicast addresses which have the
LSB of the first byte of the address set to ‘‘1’’ are treated
similarly as physical addresses i e they must match an
entry in the CAM This allows perfect filtering of Multicast
packets and eliminates the need for a hashing algorithm for
mapping Multicast packets
Broadcast Address If the address consists of all 1’s it is a
Broadcast address indicating that the packet is intended for
all nodes
The SONIC-T also provides a promiscuous mode which al-
lows reception of all physical address packets Physical
Multicast Broadcast and promiscuous address modes can
be selected via the Receive Control register
4 3 SOURCE ADDRESS
The source address is the physical address of the sending
node Source addresses cannot be multicast or broadcast
addresses This field must be passed to the SONIC-T’s
transmit buffer from the system software During transmis-
sion the SONIC-T compares the Source address with its
internal CAM address entries before monitoring the CRC of
the self-received packet If the source address of the packet
transmitted does not match a value in the CAM the packet
monitored bad flag (PMB) will be set in the transmit status
field of the transmit descriptor (see Sections 5 5 1 2 and
6 3 4) The SONIC-T does not provide Source Address in-
sertion However a transmit descriptor fragment containing
only the Source Address may be created for each packet
(See Section 5 5 1 )
4 4 LENGTH TYPE FIELD
For IEEE 802 3 type packets this field indicates the number
of bytes that are contained in the data field of the packet
For Ethernet I and II networks this field indicates the type of
packet The SONIC-T does not operate on this field
4 5 DATA FIELD
The data field has a variable octet length ranging from 46 to
1500 bytes as defined by the Ethernet specification Mes-
sages longer than 1500 bytes need to be broken into multi-
ple packets for IEEE 802 3 networks Data fields shorter
than 46 bytes require appending a pad to bring the com-
plete frame length to 64 bytes If the data field is padded
the number of valid bytes are indicated in the length field
The SONIC-T does not append pad bytes for short packets
during transmission nor check for oversize packets during
reception However the user’s driver software can easily
append the pad by lengthening the TXpkt pkt size field
and TXpkt frag size field(s) to at least 64 bytes (see Sec-
tion 5 5 1) Although the Ethernet specification defines the
maximum number of bytes in the data field the SONIC-T
can transmit and receive packets up to 64k bytes
4 6 FCS FIELD
The Frame Check Sequence (FCS) is a 32-bit CRC field
calculated and appended to a packet during transmission to
allow detection of error-free packets During reception an
23
error-free packet results in a specific pattern in the CRC
generator The AUTODIN II (X32
X16
X2
The SONIC-T may optionally append the CRC sequence
during transmission and checks the CRC both during nor-
mal reception and self-reception during a transmission (see
Section 3 3 1)
4 7 MAC (MEDIA ACCESS CONTROL) CONFORMANCE
The SONIC-T is designed to be compliant to the IEEE 802 3
MAC Conformance specification The SONIC-T implements
most MAC functions in silicon and provides hooks for the
user software to handle the remaining functions The MAC
Conformance specifications are summarized in Table 4-1
Note 1 The SONIC-T provides the byte count of the entire packet in the
RXpkt byte count (see Section 5 4 3) The user’s driver software may per-
form further filtering of the packet based upon the byte count
Note 2 The SONIC-T does not provide Source Address insertion however
a transmit descriptor fragment containing only the Source Address may be
created for each packet (See Section 5 5 1 )
Note 3 The SONIC-T does not provide Pad generation however the user’s
driver software can easily append the Pad by lengthening the TXpkt pkt
size field and TXpkt frag size field(s) to at least 64 bytes (See Section
5 5 1 )
Minimum Frame Size
Maximum Frame Size
Address Generation
Address Recognition
Pad Length Generation
Start Of Frame Delimiter
Length Field
Preamble Generation
Order of Bit Transmission
Inconsistent Frame Length
Non-Integral Octet Count
Incorrect Frame Check
Sequence
Frame Assembly
FCS Generation and Insertion
Carrier Deference
Interframe Spacing
Collision Detection
Collision Handling
Collision Backoff and
Retransmission
FCS Validation
Frame Disassembly
Back-to-Back Frames
Flow Control
Attempt Limit
Jam Size (after SFD)
Jam Size (in Preamble)
a
a
TABLE 4-1 MAC Conformance Specifications
X1
Conformance
X12
Test Name
a
(Continued)
1) polynomial is used for the CRC calculations
a
X11
a
X10
SONIC-T
a
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X8
a
a
X26
Support By
X7
User Driver
Software
a
a
X
X
X
X
X23
X5
a
a
X22
Notes
X4
1
2
3
1
a
a