WG82574IT S LBAC Intel, WG82574IT S LBAC Datasheet - Page 162
WG82574IT S LBAC
Manufacturer Part Number
WG82574IT S LBAC
Description
CONTROLLER, ENET, INTEL 82574IT, 64PQFN
Manufacturer
Intel
Datasheet
1.WG82574IT_S_LBAC.pdf
(490 pages)
Specifications of WG82574IT S LBAC
Ethernet Type
IEEE 802.3, IEEE 802.3u, IEEE 802.3ab
Supply Voltage Range
3V To 3.6V
Operating Temperature Range
-40°C To +85°C
Digital Ic Case Style
QFN
No. Of Pins
64
Package / Case
QFN
Interface Type
I2C, JTAG, PCI, SPI
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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7.2.10
7.2.10.1
Figure 35.
7.2.10.1.1
162
15
Transmit Descriptor Formats
The original descriptor is referred to as the legacy descriptor and is described in
section
descriptors. One of the new descriptor types is quite similar to the legacy descriptor in
that it points to a block of packet data. This descriptor type is called the extended data
descriptor. The other new descriptor type is fundamentally different as it does not point
to packet data. This descriptor type is called the context descriptor. It only contains
control information, which is loaded into registers of the 82574, and affects the
processing of future packets. The following paragraphs describe the three descriptor
formats.
The new descriptor types are specified by setting the TDESC.DEXT bit to 1b. If this bit
is set, the TDESC.DTYP field is examined to determine the descriptor type (extended
data or context).
shows the data descriptor generic layout.
Legacy Transmit Descriptor Format
Legacy Transmit Descriptor Format
The legacy Tx descriptor is defined by setting the DEXT bit in the command field to 0b.
The legacy Tx descriptor format is shown in
Buffer Address
The buffer address (TDESC.Buffer Address) specifies the location (address) in main
memory of the data to be fetched.
PRI
13 12 11
CFI
VLAN
7.2.10.1. The two new descriptor types are collectively referred to as extended
VLAN
0
0
8
8
Figure 36
63
CSS
Checksum
Start
VLAN
0
ExtCMD
3
48
shows the context descriptor generic layout.
47
1
CSS
TS
0
Rsv
40
3
39
Buffer Address [63:0]
ExtCMD
Res
2
36
Status
35
Res
STA
1
32
DD
31
CMD
0
Figure
IDE VLE DEXT RSV RS
7
24
23
CSO
6
35.
82574 GbE Controller—Inline Functions
5
16
Command
15
4
Length
0
3
IC
2
IFCS EOP
1
Checksum
Offset
0
Figure 38
8
CSO
0
Length
15
LENGTH
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