W311
Byte 11: Recovery Frequency N - Value Register
Bit
Name
Default
Description
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ROCV_FREQ_N7
ROCV_FREQ_N6
ROCV_FREQ_N5
ROCV_FREQ_N4
ROCV_FREQ_N3
ROCV_FREQ_N2
ROCV_FREQ_N1
ROCV_FREQ_N0
0
0
0
0
0
0
0
0
If ROCV_FREQ_SEL is set, W311 will use the values programmed in
ROCV_FREQ_N[7:0] and ROCV_FREQ_M[6:0] to determine the recovery
CPU output frequency.when a Watchdog Timer time-out occurs.
Thesetting of FS_Override bit determinesthe 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.
W312 supports programmable CPU frequency ranging from 50 MHz to 248
MHz.
W311 will change the output frequency whenever there is an update to either
ROCV_FREQ_N[7:0]and ROCV_FREQ_M[6:0]. Therefore, itisrecommended
to use Word or Block write to update both registers within the same SMBus bus
operation.
Byte 12: Recovery Frequency M- Value Register
Bit
Name
Default
Pin Description
Bit 7
ROCV_FREQ_SEL
0
ROCV_FREQ_SEL determines the source of the recover frequency when a
Watchdog Timer time-out occurs. The clock generator will automatically
switch to the recovery CPU frequency based on the selection on
ROCV_FREQ_SEL.
0 = From latched FS[4:0]
1 = From the settings of ROCV_FREQ_N[7:0] & ROCV_FREQ_M[6:0]
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ROCV_FREQ_M6
ROCV_FREQ_M5
ROCV_FREQ_M4
ROCV_FREQ_M3
ROCV_FREQ_M2
ROCV_FREQ_M1
ROCV_FREQ_M0
0
0
0
0
0
0
0
If ROCV_FREQ_SEL is set, W311 will use the values programmed in
ROCV_FREQ_N[7:0] and ROCV_FREQ_M[6:0] to determine the recovery
CPU output frequency.when a Watchdog Timer time-out occurs.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. W311 supports programmable CPU frequency
ranging from 50 MHz to 248 MHz.
Byte 13: Programmable Frequency Select N-Value Register
Bit
Name
Default
Pin Description
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
CPU_FSEL_N7
CPU_FSEL_N6
CPU_FSEL_N5
CPU_FSEL_N4
CPU_FSEL_N3
CPU_FSEL_N2
CPU_FSEL_N1
CPU_FSEL_N0
0
0
0
0
0
0
0
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. W311 supports
programmable CPU frequency ranging from 50 MHz to 248 MHz.
Rev 1.0,November 25, 2006
Page 9 of 18
SPECTRALINEAR [ SPECTRALINEAR INC ]
