NHE6300ESB S L7XJ Intel, NHE6300ESB S L7XJ Datasheet - Page 212
NHE6300ESB S L7XJ
Manufacturer Part Number
NHE6300ESB S L7XJ
Description
Manufacturer
Intel
Datasheet
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Specifications of NHE6300ESB S L7XJ
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Table 101. Token Format
5.17.6.2 Start of Frame Packets
Table 102. SOF Packet
5.17.6.3 Data Packets
Table 103. Data Packet Format
Intel
DS
212
®
6300ESB I/O Controller Hub
Token packets have a five-bit CRC which covers the address and endpoint fields as
shown above. The CRC does not cover the PID, which has its own check field. Token
and SOF packets are delimited by an EOP after three bytes of packet field data. When a
packet decodes as an otherwise valid token or SOF but does not terminate with an EOP
after three bytes, it must be considered invalid and ignored by the receiver.
Table 102
nominal rate of once every 1.00 ms +/- 0.05. SOF packets consist of a PID indicating
packet type followed by an 11-bit frame number field.
The SOF token comprises the token-only transaction that distributes a start of frame
marker and accompanying frame number at precisely timed intervals corresponding to
the start of each frame. All full speed functions, including hubs, must receive and
decode the SOF packet. The SOF token does not cause any receiving function to
generate a return packet; therefore, SOF delivery to any given function cannot be
ensured. The SOF packet delivers two pieces of timing information. A function is
informed that a start of frame has occurred when it detects the SOF PID. Frame timing
sensitive functions, which do not need to keep track of frame number, need only
decode the SOF PID; they may ignore the frame number and its CRC. When a function
needs to track frame number, it must comprehend both the PID and the time stamp.
A data packet consists of a PID, a data field, and a CRC as shown in
are two types of data packets, identified by differing PIDs: DATA0 and DATA1. Two data
packet PIDs are defined to support data toggle synchronization.
Data must always be sent in integral numbers of bytes. The data CRC is computed over
only the data field in the packet and does not include the PID, which has its own check
field.
Frame Number
Packet
ADDR
ENDP
CRC5
PID
Packet
Packet
CRC16
DATA
CRC5
PID
PID
shows a start of frame (SOF) packet. SOF packets are issued by the host at a
Width
8 bits
7 bits
4 bits
5 bits
0-1023
16 bits
Width
11 bits
Width
8 bits
bytes
8 bits
5 bits
Order Number: 300641-004US
Intel
Table
®
6300ESB ICH—5
103. There
November 2007
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