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W305B
...................... Document #: 38-07262 Rev. *B Page 12 of 20
Byte 14: Programmable Frequency Select M-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, W305B 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, W305B will use the same
frequency ratio stated in the Latched FS[4:0] register. When it is set, W305B
will use the frequency ratio stated in the SEL[4:0] register.
W305B supports programmable CPU frequency ranging from 50 MHz to
248 MHz.
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
-
Reserved
0
Reserved
Bit 6
-
Reserved
0
Reserved
Bit 5
-
Reserved
0
Reserved
Bit 4
-
Reserved
0
Reserved
Bit 3
-
Reserved
0
Reserved
Bit 2
-
Reserved
0
Reserved
Bit 1
-
Reserved
1
Reserved. Write with ‘1’
Bit 0
-
Reserved
1
Reserved. Write with ‘1’
Byte 16: Reserved Register
Bit
Pin#
Name
Default
Description
Bit 7
-
Reserved
0
Reserved
Bit 6
-
Reserved
0
Reserved
Bit 5
-
Reserved
0
Reserved
Bit 4
-
Reserved
0
Reserved
Bit 3
-
Reserved
0
Reserved
Bit 2
-
Reserved
0
Reserved
Bit 1
-
Reserved
0
Reserved
Byte 17: Reserved Register
Bit
Pin#
Name
Default
Description
Bit 7
-
Reserved
0
Reserved
Bit 6
-
Reserved
0
Reserved
Bit 5
-
Reserved
0
Reserved
Bit 4
-
Reserved
0
Reserved
Bit 3
-
Reserved
0
Reserved
Bit 2
-
Reserved
0
Reserved
Bit 1
-
Reserved
0
Reserved
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