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2) Isochronous Transfers
Figure 18-16 shows the valid packet sequence of an isochronous transfer. An isochronous
transfer is characterized by the lack of a handshake phase after a data phase. Note that a
handshake is still permitted following the token phase, if a handshake condition is present
which supersedes the data phase.
Token
Data
Handshake
From
Host
From
Device
IN
OUT
STALL
NAK
DATA
0/1
DATA
0/1
IDLE
Figure 18.16 Isochronous Bus Transaction
3) Packet to Packet Timing
Table 18-15 summarizes the packet to packet timing parameters. These times do not account
for receiver synchronization delays that may postpone the detection of bus events.
Table 18.15 Bus Time-out Periods
Parameter
Bit Times
Packet to Packet Delay
2
Response Delay
7.5
Response Time-out
16
Packet Error Time-out
16
Note:
All bit times are relative to the device speed.
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