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CY28349BOCT Datasheet(PDF) 9 Page - Cypress Semiconductor

Part # CY28349BOCT
Description  FTG for Intel짰 Pentium짰 4 CPU and Chipsets
Download  21 Pages
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CY28349BOCT Datasheet(HTML) 9 Page - Cypress Semiconductor

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CY28349B
Document #: 38-07454 Rev. *B
Page 9 of 21
Data Byte 9
Bit
Pin#
Name
Pin Description
Power On
Default
Bit 7
48MHz_DRV
48MHz and 24_48MHz clock output drive strength
0 = Normal
1 = High Drive
(Recommend to set to high drive if this output is being
used to drive both USB and SIO devices in Intel Brookdale
- G platforms)
0
Bit 6
PCI_DRV
PCI clock output drive strength
0 = Normal
1 = High Drive
0
Bit 5
3V66_DRV
3V66 clock output drive strength
0 = Normal
1 = High Drive
0
Bit 4
RST_EN_WD
This bit will enable the generation of a Reset pulse when
a Watchdog timer time-out occurs.
0 = Disabled
1 = Enabled
0
Bit 3
RST_EN_FC
This bit will enable the generation of a Reset pulse after a
frequency change occurs.
0 = Disabled
1 = Enabled
0
Bit 2
WD_TO_STATUS
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
Bit 1
WD_EN
0 = Stop and reload Watchdog Timer
1 = Enable Watchdog Timer. It will start counting down
after a frequency change occurs.
Note: CY28349B will generate system reset, reload a
recovery frequency, and lock itself into a recovery
frequency mode after a Watchdog Timer time-out occurs.
Under recovery frequency mode, CY28349B will not
respond to any attempt to change output frequency via the
SMBus control bytes. System software can unlock
CY28349B from its recovery frequency mode by clearing
the WD_EN bit.
0
Bit 0
Reserved
Reserved
0
Data Byte 10
Bit
Pin#
Name
Pin Description
Power On
Default
Bit 7
CPU_Skew2
CPU skew control
000 = Normal
001 = –150 ps
010 = –300 ps
011 = –450 ps
100 = +150 ps
101 = +300 ps
110 = +450 ps
111 = +600 ps
0
Bit 6
CPU_Skew1
0
Bit 5
CPU_Skew0
0
Bit 4
Fixed 3V66/PCI
Fixed 3V66 and PCI output mode
0 = Disabled
1 = Enabled
When enabled, 3V66 and PCI output frequency will be
fixed at 64 MHz and 32 MHz respectively.
0


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