W83627DHG
Publication Release Date: Aug, 22, 2007
-174- Version
1.4
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.
Table 15.1 SERIRQ Sampling Periods
SERIRQ SAMPLING PERIODS
IRQ/DATA FRAME
SIGNAL SAMPLED
# OF CLOCKS PAST
START
EMPLOYED BY
1 IRQ0 2 -
2 IRQ1 5
Keyboard
3 SMI# 8 -
4 IRQ3 11
UART
B
5 IRQ4 14
UART
A
6 IRQ5 17 -
7 IRQ6 20 FDC
8 IRQ7 23 LPT
9 IRQ8 26 -
10 IRQ9 29 -
11 IRQ10 32
-
12 IRQ11 35
-
13 IRQ12 38 Mouse
14 IRQ13 41
-
15 IRQ14 44
-
16 IRQ15 47
-
17 IOCHCK# 50
-
18 INTA# 53
-
19 INTB# 56
-
20 INTC# 59
-
21 INTD# 62
-
32:22 Unassigned 95
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Summary of Contents for W83627DHG
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