Table 18.15 Bus Time-Out Periods; Figure 18.16 Isochronous Bus Transaction - Hitachi HD64465 User Manual

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
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
Packet to Packet Delay
Response Delay
Response Time-out
Packet Error Time-out
Note: All bit times are relative to the device speed.
IN
DATA
0/1
NAK

Figure 18.16 Isochronous Bus Transaction

IDLE
OUT
DATA
0/1
STALL
Bit Times
2
7.5
16
16
Rev. 3.0, 03/01, page 305 of 390
From From
Host Device