W83627DHG Datasheet, PDF (186/268 Pages) Winbond – WINBOND LPC I/O

W83627DHG
15.2 IRQ/Data Frame
Once the Start Frame has been initiated, the W83627DHG must start counting frames based on the
rising edge of the start pulse. Each IRQ/Data Frame has three clocks: the Sample phase, the Recovery
phase, and the Turn-around phase.
During the Sample phase, the W83627DHG drives SERIRQ low if the corresponding IRQ is active. If
the corresponding IRQ is inactive, then SERIRQ must be left tri-stated. During the Recovery phase, the
W83627DHG device drives the SERIRQ high. During the Turn-around phase, the W83627DHG device
leaves the SERIRQ tri-stated. The W83627DHG starts to drive the SERIRQ line from the beginning of
"IRQ0 FRAME" based on the rising edge of PCICLK.
The IRQ/Data Frame has a specific numeral order, as shown in Table 15.1.
IRQ/DATA FRAME
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
32:22
Table 15.1 SERIRQ Sampling Periods
SERIRQ SAMPLING PERIODS
SIGNAL SAMPLED
# OF CLOCKS PAST
START
IRQ0
2
IRQ1
5
SMI#
8
IRQ3
11
IRQ4
14
IRQ5
17
IRQ6
20
IRQ7
23
IRQ8
26
IRQ9
29
IRQ10
32
IRQ11
35
IRQ12
38
IRQ13
41
IRQ14
44
IRQ15
47
IOCHCK#
50
INTA#
53
INTB#
56
INTC#
59
INTD#
62
Unassigned
95
EMPLOYED BY
-
Keyboard
-
UART B
UART A
-
FDC
LPT
-
-
-
-
Mouse
-
-
-
-
-
-
-
-
-
-174-
Publication Release Date: Aug, 22, 2007
Version 1.4