W311
Document #: 38-07703 Rev. **
Page 10 of 19
Byte 14: Programmable Frequency Select N-Value Register
Bit
Name
Default
Description
Bit 7
Pro_Freq_EN
0
Programmable output frequencies enabled
0 = disabled
1 = enabled
Bit 6
CPU_FSEL_M6
0
If Prog_Freq_EN is set, W311 will use the values programmed in
CPU_FSEL_N[7:0] and CPU_FSEL_M[6:0] to determine the CPU output
frequency. The new frequency will start to load whenever CPU_FSELM[6:0]
is updated.
The setting of FS_Override bit determines the frequency ratio for CPU,
SDRAM, AGP and SDRAM. When it is cleared, W311 will use the same
frequency ratio stated in the Latched FS[4:0] register. When it is set, W311
will use the frequency ratio stated in the SEL[4:0] register.
Bit 5
CPU_FSEL_M5
0
Bit 4
CPU_FSEL_M4
0
Bit 3
CPU_FSEL_M3
0
Bit 2
CPU_FSEL_M2
0
Bit 1
CPU_FSEL_M1
0
Bit 0
CPU_FSEL_M0
0
Byte 15: Reserved Register
Bit
Pin#
Name
Default
Description
Bit 7
47
Latched FS4 input
X
Latched FS[4:0] inputs. These bits are read only.
Bit 6
6
Latched FS3 input
X
Bit 5
7
Latched FS2 input
X
Bit 4
21
Latched FS1 input
X
Bit 3
22
Latched FS0 input
X
Bit 2
-
Vendor test mode
0
Reserved. Write with ‘0’
Bit 1
-
Vendor test mode
1
Reserved. Write with ‘1’
Bit 0
-
Vendor test mode
1
Reserved. Write with ‘1’
Byte 16: Reserved Register
Bit
Pin#
Name
Default
Description
Bit 7
-
Vendor test mode
0
Reserved. Write with ‘0’.
Bit 6
-
Vendor test mode
0
Reserved. Write with ‘0’.
Bit 5
-
Vendor test mode
0
Reserved. Write with ‘0’.
Bit 4
-
Vendor test mode
0
Reserved. Write with ‘0’.
Bit 3
-
Vendor test mode
0
Reserved. Write with ‘0’.
Bit 2
-
Vendor test mode
0
Reserved. Write with ‘0’.
Bit 1
-
Vendor test mode
0
Reserved. Write with ‘0’.
Bit 0
-
Vendor test mode
0
Reserved. Write with ‘0’.
Byte 17: Reserved Register
Bit
Pin#
Name
Default
Description
Bit 7
-
Vendor test mode
0
Reserved. Write with ‘0’.
Bit 6
-
Vendor test mode
0
Reserved. Write with ‘0’.
Bit 5
-
Vendor test mode
0
Reserved. Write with ‘0’.
Bit 4
-
Vendor test mode
0
Reserved. Write with ‘0’.
Bit 3
-
Vendor test mode
0
Reserved. Write with ‘0’.
Bit 2
-
Vendor test mode
0
Reserved. Write with ‘0’.
Bit 1
-
Vendor test mode
0
Reserved. Write with ‘0’.
Bit 0
-
Vendor test mode
0
Reserved. Write with ‘0’.
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