CY28326
Pin Definition (continued)
Pin No.
24
Name
VDD48
AGP0/AGP2 VDDAGP
PWR
Type
I
Description
Power for 48MHz clock output.
AGP Clock Output.
25,29
26
O
*RatioSEL
/AGP1
VDDAGP
I/O
Power-on Bi-directional Input/output. At power up, RatioSel is
the input. when the power supply voltage crosses the input
threshold voltage, RatioSel state is latched and this pin becomes
AGP clock output. Default pull-up.
27
28
30
31
32
VDDAGP
VSSAGP
SRESET#
SCLK
I
I
3.3V power supply for AGP clock output.
Ground for AGP clock output.
O
I
System Reset Control Output.
Serial clock input. Conforms to the Philips I2C specification.
Serial clock input. Conforms to the Philips I2C specification of a
Slave Receive/Transmit device. it is an input when receiving data.
It is open drain output when acknowledging or transmitting data.
SDATA
I/O
33
*VTT_PWRG
D/PD#
I
VTT_PWRGD: 3.3V LVTTL input to determine when FS[D:A],
MODE, RatioSEL and 24_48_SEL inputs are valid and ready to
be sampled.
PD#: Invokes powerdown mode. Default Internal pull up.
34
35,36
37
VDDSRC
25MHz[0:1]
VSSSRC
I
O
I
Power for 25 MHz clock output. 3.3V Power Supply.
25 MHz Clock Output.
VDDSRC
Ground for 25 MHz clock output.
CPU Clock outputs.
39,38,42,41,45,44 CPU[T/C][0:2] VDDCPU
O
I
40
43
46
VDDCPU
VSSCPU
IREF
Power for CPU clock output.
Ground for CPU clock output.
I
I
Current Reference. A precision resistor is attached to this pin,
which is connected to the internal current reference.
47
48
VSSA
VDDA
I
I
Ground for output.
3.3V Power Supply for output
Table 1. Frequency Table
PLL Gear
Constant
(Million)
FS(D:A)
FS(3:0)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
CPU (MHz)
AGP (MHz)
73.3
73.3
73.3
73.3
66.7
66.7
66.7
66.7
67.3
67.0
67.0
66.8
66.7
66.7
66.7
66.7
PCI (MHz)
36.6
36.6
36.6
36.6
33.3
33.3
33.3
33.3
33.6
33.5
33.5
33.4
33.3
33.3
33.3
33.3
SATA (MHz)
25.0
VCO (MHz)
660.00
586.68
440.00
733.33
466.67
533.33
666.67
600.00
807.2
110.0
146.6
220.0
183.3
233.3
266.6
333.3
300.0
100.9
133.9
200.9
166.9
100.0
133.3
200.0
166.6
25.00258122
37.50387182
75.00774365
37.50387182
75.00774365
75.00774365
75.00774365
75.00774365
18.75193591
25.00258122
37.50387182
37.50387182
18.75193591
25.00258122
37.50387182
37.50387182
25.0
25.0
25.0
25.0
25.0
25.0
25.0
25.0
25.0
803.4
25.0
803.6
25.0
667.6
25.0
800.00
800.00
800.00
666.67
25.0
25.0
25.0
Rev 1.0,November 20, 2006
Page 3 of 22
SPECTRALINEAR [ SPECTRALINEAR INC ]
