CY28349
Data Byte 8 (continued)
Power On
Default
Bit
Bit 5
Pin#
--
Name
WD_TIMER4
Pin Description
These bits store the time-out value of the Watchdog Timer.
The scale of the timer is determine by the prescaler.
The timer can support a value of 150 ms to 4.8 sec when
the pre-scaler is set to 150 ms. If the prescaler is set to
2.5 sec, it can support a value from 2.5 sec to 80 sec.
When the Watchdog Timer reaches “0,” it will set the
WD_TO_STATUS bit and generate Reset if RST_EN_WD
is enabled.
1
1
1
1
1
Bit 4
Bit 3
Bit 2
Bit 1
--
WD_TIMER3
WD_TIMER2
WD_TIMER1
WD_TIMER0
--
--
--
Bit 0
--
WD_PRE_SCALER
0 = 150 ms
1 = 2.5 sec
0
Data Byte 9
Power On
Default
Bit
Pin#
Name
Pin Description
Bit 7
--
48MHz_DRV
48MHz and 24_48MHz clock output drive strength
0 = Normal
1 = High Drive
0
(Recommend to set to high drive if this output is being used
to drive both USB and SIO devices in Intel Brookdale - G
platforms)
Bit 6
Bit 5
Bit 4
--
--
--
PCI_DRV
PCI clock output drive strength
0 = Normal
1 = High Drive
0
0
0
3V66_DRV
RST_EN_WD
3V66 clock output drive strength
0 = Normal
1 = High Drive
This bit will enable the generation of a Reset pulse when a
watchdog timer time-out occurs.
0 = Disabled
1 = Enabled
Bit 3
Bit 2
Bit 1
--
--
--
RST_EN_FC
WD_TO_STATUS
WD_EN
This bit will enable the generation of a Reset pulse after a
0
0
0
frequency change occurs.
0 = Disabled
1 = Enabled
Watchdog Timer Time-out Status bit
0 = No time-out occurs (Read); Ignore (Write)
1 = time-out occurred (Read); Clear WD_TO_STATUS
(Write)
0 = Stop and reload Watchdog Timer
1 = Enable Watchdog Timer. It will start counting down after
a frequency change occurs.
Note: CY28349 will generate system reset, reload a
recovery frequency, and lock itself into a recovery
frequency mode after a Watchdog Timer time-out occurs.
Underrecoveryfrequencymode, CY28349willnotrespond
to any attempt to change output frequency via the SMBus
control bytes. System software can unlock CY28349 from
its recovery frequency mode by clearing the WD_EN bit.
Bit 0
--
Reserved
Reserved
0
Rev 1.0,November 24, 2006
Page 9 of 20
SPECTRALINEAR [ SPECTRALINEAR INC ]
