參數(shù)資料
型號: ICS952623YFT
英文描述: Programmable Timing Control Hub for Next Gen P4 processor
中文描述: 可編程定時控制中心,為下一代P4處理器
文件頁數(shù): 23/27頁
文件大小: 329K
代理商: ICS952623YFT
23
Integrated
Circuit
Systems, Inc.
ICS952623
Advance Information
0758—02/08/05
The following diagrams illustrate SRC clock timing during PCI_Stop# and PwrDwn# modes with SRC_Pwrdwn and
SRC_Stop tristate control bits set to driven or tristate in byte 2 of the control register.
SRC_Stop = Driven, SRC_Pwrdwn = Driven
PCI_Stop#
1.8mS
PWRDWN#
PCI (Free Running)
CPU (Free Running)
CPU# (Free Running)
SRC (Stoppable)
SRC# (Stoppable)
1 PCI
clock max
Notes:
1. When both bits (SRC_Stop & SRC_Pwrdown tristate bits) are set to driven, the clock chip will never tristate the SRC output
clock (assuming clock's OE bit is set to "1")
SRC Clock Tristate Timing
SRC_Stop = Tristate, Pwrdwn = Tristate
PCI_Stop#
1.8mS
PWRDWN#
PCI (Free Running)
CPU (Free Running)
CPU# (Free Running)
SRC (Stoppable)
SRC# (Stoppable)
1 PCI
clock max
Notes:
1. When SRC_Stop and SRC_Pwrdwn bits are set to tristate, the clock chip will tristate outputs during the assertion of
PCI_Stop# and PWRDWN#.
2. Tristate outputs are pulled low by output termination resistors as shown here.
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