NQ5000P S L9TN Intel, NQ5000P S L9TN Datasheet - Page 350
NQ5000P S L9TN
Manufacturer Part Number
NQ5000P S L9TN
Description
Manufacturer
Intel
Datasheet
1.NQ5000P_S_L9TN.pdf
(530 pages)
Specifications of NQ5000P S L9TN
Mounting
Surface Mount
Lead Free Status / RoHS Status
Not Compliant
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Figure 5-22. PCI Express Deskew Buffer (4X Example)
5.12.7.5
5.12.8
350
At reset, the delay of each lane in the deskew buffer is adjusted so that the symbols on
each lane are aligned. The receiver must compensate for the allowable skew between
lanes within a multi-lane link before delivering the data and control to the data link
layer. The deskew buffer is eight symbols deep to compensate for up to 20 ns of skew
between lanes.
Polarity Inversion
The PCI Express Base Specification, Revision 1.0a defines a concept called polarity
inversion. Polarity inversion allows the board designer to connect the D+ and D- lines
incorrectly between devices. The Intel 5000P Chipset MCH supports polarity inversion.
Link Layer
The Data Link Layer of the PCI Express protocol is primarily responsible for data
integrity. This is accomplished with the following elements:
Figure 5-23
two types of packets: data link layer packets (DLLP) and Transaction Layer Packets
(TLP). Data Link layer packets are sent between the Link layers of each PCI Express
device and do not proceed to the Transaction Layer.
For Transaction layer packets (TLP), the link layer is responsible for prepending
sequence numbers and appending 32-bit CRC. The grayed out segment is not decoded
by the Data Link layer.
• Sequence number assignment for each packet
• ACK/NAK protocol to ensure successful transmission of every packet
• CRC protection of packets
• Time-out mechanism to detect “lost” packets
• Credit exchange
illustrates the scope of the link layer on a PCI Express packet. There are
Intel® 5000P/5000V/5000Z Chipset Memory Controller Hub (MCH) Datasheet
Elastic Buffer
Functional Description
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