WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 132
WG82574L S LBA8
Manufacturer Part Number
WG82574L S LBA8
Description
Manufacturer
Intel
Datasheet
1.WG82574L_S_LBA8.pdf
(472 pages)
Specifications of WG82574L S LBA8
Operating Supply Voltage (typ)
3.3V
Operating Temp Range
0C to 85C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
64
Lead Free Status / RoHS Status
Compliant
- Current page: 132 of 472
- Download datasheet (3Mb)
7.1.7.2
Note:
7.1.8
Figure 26.
132
Null Descriptor Padding
Hardware stores no data in descriptors with a null data address. Software can make
use of this property to cause the first condition under receive descriptor packing to
occur early. Hardware writes back null descriptors with the DD bit set in the status byte
and all other bits unchanged.
Null descriptor padding is not supported for packet split descriptors.
Receive Descriptor Queue Structure
Figure 26
two circular queues of descriptors and writes back used descriptors just prior to
advancing the head pointer(s). Head and tail pointers wrap back to base when size
descriptors have been processed.
Receive Descriptor Ring Structure
Software adds receive descriptors by advancing the tail pointer(s) to refer to the
address of the entry just beyond the last valid descriptor. This is accomplished by
writing the descriptor tail register(s) with the offset of the entry beyond the last valid
descriptor. The hardware adjusts its internal tail pointer(s) accordingly. As packets
arrive, they are stored in memory and the head pointer(s) is incremented by hardware.
When the head pointer(s) is equal to the tail pointer(s), the queue(s) is empty.
Hardware stops storing packets in system memory until software advances the tail
pointer(s), making more receive buffers available.
Base + Size
Base
shows the structure of the two receive descriptor rings. Hardware maintains
Circular Buffer Queues
Head
Tail
82574 GbE Controller—Inline Functions
Receive
Queue
Related parts for WG82574L S LBA8
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
CONTROLLER, ENET, INTEL 82574L, 64PQFN
Manufacturer:
Intel
Datasheet:
Part Number:
Description:
Microprocessor: Intel Celeron M Processor 320 and Ultra Low Voltage Intel Celeron M Processor at 600MHz
Manufacturer:
Intel Corporation
Part Number:
Description:
Intel 82550 Fast Ethernet Multifunction PCI/CardBus Controller
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel StrataFlash memory 32 Mbit. Access speed 120 ns
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel StrataFlash memory 32 Mbit. Access speed 120 ns
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel StrataFlash memory 64 Mbit. Access speed 150 ns
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel StrataFlash memory 32 Mbit. Access speed 100 ns
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
DA28F640J5A-1505 Volt Intel StrataFlash Memory
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
5 Volt Intel StrataFlash?? Memory
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
5 Volt Intel StrataFlash?? Memory
Manufacturer:
Intel Corporation
Part Number:
Description:
Intel 6300ESB I/O Controller Hub
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel 82801DB I/O Controller Hub (ICH4), Pb-Free SLI
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel 82801FB I/O Controller Hub (ICH6)
Manufacturer:
Intel Corporation
Datasheet: