NHE6300ESB S L7XJ Intel, NHE6300ESB S L7XJ Datasheet - Page 726

• Manufacturer Part Number: NHE6300ESB S L7XJ
• Manufacturer: Intel

Specifications of NHE6300ESB S L7XJ

• Lead Free Status / RoHS Status: Compliant

Figure 35. Stop Frame Timing with Host Using 17 SIU_SERIRQ Sampling Period
19.7.1.1 SIU_SERIRQ Cycle Control
Intel
DS
726
®
6300ESB I/O Controller Hub
Note: Upon reset, SIU_SERIRQ bus is defaulted to Continuous mode, therefore only the Host
There are two modes of operation for the SIU_SERIRQ Start Frame.
controller may initiate the first Start Frame. Slaves must continuously sample the Stop
Frames pulse width to determine the next SIU_SERIRQ Cycle’s mode.
Each SIU port must use a dedicated interrupt. SIU interrupts cannot be shared with
each other or with other devices.
NOTES:
1. H=Host Control; R=Recovery; T=Turn-Around; S=Sample; I=Idle
2. Stop pulse is 2 clocks wide for Quiet mode, 3 clocks wide for Continuous mode.
3. There may be none, one or more Idle states during the Stop Frame.
4. The next SIU_SERIRQ cycle’s Start Frame pulse may or may not start immediately after the
1. Quiet (Active) Mode: Any device may initiate a Start Frame by driving the
2. Continuous (Idle) Mode: Only the Host controller may initiate a Start Frame to
PCI_CLK
SER_IRQ
turn-around clock of the Stop Frame.
SIU_SERIRQ low for one clock, while the SIU_SERIRQ is Idle. After driving low for
one clock the SIU_SERIRQ is immediately tri-stated without at any time driving
high. A Start Frame may not be initiated while the SIU_SERIRQ is Active. The
SIU_SERIRQ is Idle between Stop and Start Frames. The SIU_SERIRQ is Active
between Start and Stop Frames. This mode of operation allows the SIU_SERIRQ to
be Idle when there are no IRQ/Data transitions which should be most of the time.
Once a Start Frame has been initiated the Host Controller will take over
driving the SIU_SERIRQ low in the next clock and will continue driving the
SIU_SERIRQ low for a programmable period of three to seven clocks. This
makes a total low pulse width of four to eight clocks. Finally, the Host
Controller will drive the SIU_SERIRQ back high for one clock, then tri-
state.
Any SIU_SERIRQ Device (i.e., the SIU) which detects any transition on an
IRQ/Data line for which it is responsible must initiate a Start Frame in
order to update the Host Controller unless the SIU_SERIRQ is already in an
SIU_SERIRQ Cycle and the IRQ/Data transition may be delivered in that
SIU_SERIRQ Cycle.
update IRQ/Data line information. All other SIU_SERIRQ agents become passive
and may not initiate a Start Frame. SIU_SERIRQ will be driven low for four to eight
clocks by Host Controller. This mode has two functions. It may be used to stop or
idle the SIU_SERIRQ or the Host Controller may operate SIU_SERIRQ in a
continuous mode by initiating a Start Frame at the end of every Stop Frame.
An SIU_SERIRQ mode transition may only occur during the Stop Frame.
Driver
S
FRAME
None
IRQ14
R
T
S
IRQ15
IRQ15
FRAME
R
T
S
IOCHCK#
None
FRAME
R
T
I
2
STOP FRAME
Host Controller
STOP
H
1
Order Number: 300641-004US
R
Intel
T
®
6300ESB ICH—19
NEXT CYCLE
November 2007
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