WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 319

• Manufacturer Part Number: WG82574L S LBA8
• Manufacturer: Intel

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

Driver Programing Interface—82574 GbE Controller
Table 78.
LPE controls whether long packet reception is permitted. Hardware discards long
packets if LPE is 0b. A long packet is one longer than 1522 bytes.
RDMTS[1,0] determines the threshold value for free receive descriptors according to
the following table:
RDMTS Values
BSIZE controls the size of the receive buffers and permits software to trade-off
descriptor performance versus required storage space. Buffers that are 2048 bytes
require only one descriptor per receive packet maximizing descriptor efficiency. Buffers
that are 256 bytes maximize memory efficiency at a cost of multiple descriptors for
packets longer than 256 bytes.
Three bits control the VLAN filter table. The first determines whether the table
participates in the packet acceptance criteria. The next two are used to decide whether
the CFI bit found in the 802.1Q packet should be used as part of the acceptance
criteria.
DPF controls the DMA function of flow control packets addressed to the station address
(RAH/L[0]). If a packet is a valid flow control packet and is addressed to the station
address it is not DMA'd to host memory if DPF=1b.
DPF
PMCF
Reserved
BSEX
SECRC
FLXBUF
Reserved
Field
22
23
24
25
26
30:27
31
RDMTS
Bit(s)
00b
01b
10b
11b
0b
0b
0b
0b
0b
0x0
0b
Initial
Value
Discard Pause Frames
Any valid pause frame is discarded regardless of whether it matches
any of the filter registers.
0b = Incoming frames subject to filter comparison.
1b = Incoming pause frames ignored even if they match filter
registers.
Pass MAC Control Frames
0b = Do not (specially) pass MAC control frames.
1b = Pass any MAC control frame (type field value of 0x8808) that
does not contain the pause opcode of 0x0001.
Reserved
Should be written with 0b to ensure future compatibility.
Buffer Size Extension
Modifies the buffer size indication (BSIZE). When set to 1b, the
original BSIZE values are multiplied by 16.
Strip Ethernet CRC from incoming packet.
Do not DMA to host memory.
Determines a flexible buffer size. When this field is 0x0000, the buffer
size is determined by BSIZE. If this field is different from 0x0000, the
receive buffer size is the number represented in KB. For example,
0x0001 = 1 KB (1024 bytes).
Reserved
Should be written with 0b to ensure future compatibility.
Free Buffer Threshold
Description
Reserved
1/2
1/4
1/8
319