w83977atg Winbond Electronics Corp America, w83977atg Datasheet - Page 138

• Manufacturer Part Number: w83977atg
• Description: W83877tf Plus Kbc, Gp I/o, Wake-up, Fir, Cir, Pb-free
• Manufacturer: Winbond Electronics Corp America

Continued.
13.3 Stop Frame
After all IRQ/Data Frames have completed, the host controller will terminate IRQSER by a Stop frame.
Only the host controller can initiate the Stop frame by driving IRQSER low for 2 or 3 clocks. If the Stop
Frame is low for 2 clocks, the next IRQSER cycle's Sample mode is the Quiet mode. If the Stop
Frame is low for 3 clocks, the next IRQSER cycle's Sample mode is the Continuous mode.
13.4 Reset and Initialization
After MR reset, IRQSER Slaves are put into the Continuous (Idle) mode. The Host Controller is
responsible for starting the initial IRQSER Cycle to collect the system's IRQ/Data default values. The
system then follows with the Continuous/Quiet mode protocol (Stop Frame pulse width) for
subsequent IRQSER cycles. It's the Host Controller's responsibility to provide the default values to
8259's and other system logic before the first IRQSER cycle is performed. For IRQSER system
suspend, insertion, or removal application, the Host controller should be programmed into Continuous
(Idle) mode first. This is to guarantee IRQSER bus in the Idle state before the system configuration
changes.
IRQ/DATA FRAME
32:22
14
15
16
17
18
19
20
21
SIGNAL SAMPLED
Unassigned
IOCHCK
IRQ13
IRQ14
IRQ15
INTC
INTD
INTA
INTB
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W83977ATF/W83977ATG
# OF CLOCKS PAST START
41
44
47
50
53
56
59
62
95