CY28339
Byte 6: Silicon Signature Register[5] (all bits are Read-only)
7
6
5
4
3
2
1
0
0
0
0
1
0
0
1
1
Revision = 0001
Vendor Code = 0011
Byte 7: Reserved Register
Bit
7
@Pup
Name
Description
0
0
0
0
0
0
0
0
Reserved. Set = 0.
Reserved. Set = 0.
Reserved. Set = 0.
Reserved. Set = 0.
Reserved. Set = 0.
Reserved. Set = 0.
Reserved. Set = 0.
Reserved. Set = 0.
6
5
4
3
2
1
0
Byte 8: Dial-a-Frequency Control Register N
Bit
7
@Pup
Name
Description
0
0
0
0
0
0
0
0
Reserved. Set = 0.
6
N6, MSB
N5
These bits are for programming the PLL’s internal N register. This access
allows the user to modify the CPU frequency at very high resolution
(accuracy). All other synchronous clocks (clocks that are generated from
the same PLL, such as PCI) remain at their existing ratios relative to the
CPU clock.
5
4
N4
3
N3
2
N2
1
N3
0
N0, LSB
Byte 9: Dial-a-Frequency Control Register R
Bit
7
@Pup
Name
Description
0
0
0
0
0
0
0
Reserved. Set = 0.
6
R5, MSB
R4
These bits are for programming the PLL’s internal R register. This access
allows the user to modify the CPU frequency at very high resolution
(accuracy). All other synchronous clocks (clocks that are generated from
the same PLL, such as PCI) remain at their existing ratios relative to the
CPU clock.
5
4
R3
3
R2
2
R1
1
R0
DAF_ENB
R and N register mux selection. 0 = R and N values come from the ROM.
1 = data is loaded from DAF (SMBus) registers.
0
0
Note:
5. When writing to this register, the device will acknowledge the Write operation, but the data itself will be ignored.
Rev 1.0,November 25, 2006
Page 5 of 17
SPECTRALINEAR [ SPECTRALINEAR INC ]
