CY28326 Datasheet, PDF (2/22 Pages) Cypress Semiconductor – FTG for VIA PT880 Serial Chipset

CY28326
Pin Definition
Pin No.
1
Name
**FSA/REF0
PWR
VDDREF
2
**FSB/REF1 VDDREF
3
VDDREF
4
XIN
VDDREF
5
XOUT
VDDREF
6
VSSREF
7
*FSC/PCIF0 VDDPCI
8
*FSD/PCIF1 VDDPCI
9
*MODE/
VDDPCI
PCIF2
10,17
11,18
12,13,14,15,16
19
VDDPCI
VSSPCI
PCI[0:4]
*(PCI_STP#) VDDPCI
Ratio0/PCI5
20
*(CPU_STP#) VDDPCI
Ratio1/PCI6
21
48 MHz
VDD48
22
**24_48_SEL/ VDD48
24_48 MHz
23
VSS48
Type
I/O
I/O
I
I
O
PWR
I/O
I/O
I/O
I
I
O
O
O
O
I/O
I
Description
Power-on Bi-directional Input/Output. At power-up, FSA is the
input. when VTT_PWRGD transitions to a logic high, FSA state is
latched and this pin becomes REF0, buffered output copy of the
device’s XIN clock. Default Internal pull down.
Power-on Bi-directional Input/Output. At power-up, FSB is the
input. when VTT_PWRGD transitions to a logic high, FSB state is
latched and this pin becomes REF1, buffered output copy of the
device’s XIN clock. Default Internal pull down.
3.3V Power supply for REF clock output.
Oscillator Buffer Input. Connect to a crystal or to an external
clock.
Oscillator Buffer Input. Connect to a crystal. Do not connect
when an external clock is applied at XIN.
Ground for REF clock outputs
Power-on Bi-directional Input/ Output. At power up, FSC is the
input. When the VTT_PWRGD transitions to a logic high, FSC
state is latched and this pin becomes PCIF0. Default Internal pull
up.
Power-on Bi-directional Input/ Output. At power up, FSD is the
input. When the VTT_PWRGD transitions to a logic high, FSD
state is latched and this pin becomes PCIF. Default Internal pull
up.
Power-on Bi-directional Input/ Output. At power up,
MODE/PCIF2 is the input. When the power up, MODE state is
latched and then pin9 becomes PCIF2, PCI clock output for PCI
Device.Default pull-up, See Table 2
3.3V power supply for PCI clock output.
Ground for PCI clock output.
PCI clock outputs.
Ratio0 Output/PCI5 Output. At power up when RatioSel (pin 26)
strapping = “High” & MODE (pin 9) strapping=”High”, (PCI_STP#)
Ratio0/PCI5 becomes PCI5 clock output. At power up when
RatioSel (pin 26) strapping = “low” & MODE (pin 9) strapping
=”High”, (PCI_STP#)Ratio0/PCI5 becomes Ratio0 output to
support North bridge over freq strapping function. Once
MODE(pin 9) strapping=”Low”, then (PCI_STP#)Ratio0/PCI5
becomes PCI_STP#, Default = “PCI5” see Table 2, Default
Internal pull up.
Ratio1 Output/PCI6 Output. At power up when RatioSel(pin 26)
strapping = “High” & MODE(pin 9) strapping=”High”, (CPU_STP#)
Ratio1/PCI6 becomes PCI6 clock output. At power up when
RatioSel (pin 26) strapping = “low” & MODE(pin 9) strapping
=”High”, (PCI_STP#)Ratio1/PCI6 becomes Ratio1 output to
support North bridge over freq strapping function. Once
MODE(pin 9) strapping=”Low”, then (PCI_STP#)Ratio1/PCI6
becomes CPU_STP#, Default = “PCI6” see Table 2, Default
Internal pull up.
48 MHz Clock Output.
Power-on Bi-directional Input/output. At power up 24_48_SEL
is the input. When VTT_PWRGD is transited to logic high,
24_48_SEL state is latched and this pin becomes 24/48 MHz
output, Default 24_48_SEL= “0”, 48 MHz output.Default Internal
pull down.
Ground for 48 MHz clock output.
Rev 1.0, November 20, 2006
Page 2 of 22