82801CA Datasheet, PDF (465/521 Pages) Intel Corporation – I/O Controller Hub 3-S (ICH3-S)

Electrical Characteristics
Table 16-7. Clock Timings (Continued)
Sym
t29
t30
fhi
t31
t32
t33
t34
t35
Parameter
Rise Time
Fall Time
Hub Interface Clock
Operating Frequency
High Time
Low Time
Rise Time
Fall Time
CLK66 leads PCICLK
Min Max Unit Notes Figure
2.0
6.0
ns
4
16-1
2.0
6.0
ns
4
16-1
66
6.0
6.0
0.25 1.2
0.25 1.2
1.0
4.5
MHz
ns
ns
ns
ns
ns
16-1
16-1
16-1
16-1
5
NOTES:
1. The USBCLK is a 48 MHz that expects a 40/60% duty cycle.
2. USBCLK is a pass-thru clock that is not altered by the ICH3. This frequency tolerance specification is
required for USB 1.1 compliance and is affected by external elements such as the clock generator and the
system board.
3. The maximum high time (t18 Max) provide a simple guaranteed method for devices to detect bus idle
conditions.
4. BITCLK rise and fall times are measured from 10%VDD and 90%VDD.
5. This specification includes pin-to-pin skew from the clock generator as well as board skew.
6. SUSCLK duty cycle can range from 30% minimum to 70% maximum.
Table 16-8. PCI Interface Timing
Sym
Parameter
Min
t40 AD[31:0] Valid Delay
2
t41 AD[31:0] Setup Time to PCICLK Rising
7
t42 AD[31:0] Hold Time from PCICLK Rising
0
C/BE[3:0]#, FRAME#, TRDY#, IRDY#, STOP#, PAR,
t43 PERR#, PLOCK#, DEVSEL# Valid Delay from
2
PCICLK Rising
C/BE[3:0]#, FRAME#, TRDY#, IRDY#, STOP#, PAR,
t44 PERR#, PLOCK#, IDSEL, DEVSEL# Output Enable
2
Delay from PCICLK Rising
C/BE[3:0]#, FRAME#, TRDY#, IRDY#, STOP#,
t45 PERR#, PLOCK#, DEVSEL#, GNT[A:B]# Float Delay 2
from PCICLK Rising
C/BE[3:0]#, FRAME#, TRDY#, IRDY#, STOP#,
t46 SERR#, PERR#, DEVSEL#, Setup Time to PCICLK
7
Rising
C/BE[3:0]#, FRAME#, TRDY#, IRDY#, STOP#,
t47 SERR#, PERR#, DEVSEL#, REQ[A:B]# Hold Time
0
from PCLKIN Rising
t48 PCIRST# Low Pulse Width
1
t49
GNT[A:B}#, GNT[5:0]# Valid Delay from PCICLK
Rising
2
t50 REQ[A:B]#, REQ[5:0]# Setup Timer to PCICLK Rising 12
Max Units Notes Figure
11
ns
Min: 0pF
Max: 50pF
16-2
ns
16-3
ns
16-3
11
ns
Min: 0pF
Max: 50pF
16-2
ns
16-6
28
ns
16-4
ns
16-3
ns
ms
12
ns
ns
16-3
16-5
Intel^® 82801CA ICH3-S Datasheet
465