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W83627DHG
Publication Release Date: Aug, 22, 2007
-175- Version
1.4
15.3 Stop Frame
After all IRQ/Data Frames have completed, the host controller will terminates SERIRQ with a Stop
frame. Only the host controller can initiate the Stop Frame by driving SERIRQ low for 2 or 3 clocks. If
the Stop Frame is low for 2 clocks, the Sample mode of next SERIRQ cycle’s Sample mode is the Quiet
mode. If the Stop Frame is low for 3 clocks, the Sample mode of next SERIRQ cycle is the Continuous
mode.
Please see the diagram below for more details.
Stop Frame Timing with Host Using 17 SERIRQ sampling period.
S
R
T
S
SERIRQ
PCICLK
Host Controller
IRQ15
Driver
R
T
None
IRQ14
IRQ15
S
R
T
IOCHCK#
None
STOP
R
T
STOP FRAME
H
I
START
NEXT CYCLE
1
2
FRAME
FRAME
FRAME
H=Host Control
R=Recovery
T=Turn-around
S=Sample
I= Idle.
Note:
1. There may be none, one or more Idle states during the Stop Frame.
2. The Start Frame pulse of next SERIRQ cycle may or may not start immediately after the
turn-around clock of the Stop Frame.
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