C9820
Direct Rambus Clock Generator
Preliminary
Power Management Functions (Cont.)
In the “power down” mode, the device is completely powered down for minimum power dissipation. This mode is used in
conjunction with the power down modes of the RDRAMs and RAC.
The device has three operating states: normal, Clock off and powerdown. In normal mode, the clock source is on, and
the output is enabled. In Clock off mode, the clock source is on, but the output is disabled (StopB asserted). In
powerdown mode, the device is powered down with the control signal PwrDnB equal to 0. the control signals Mult0,
Mult1, S0, and S1 must be stable before power is applied to the device, and can only be changed in power-down mode
(PwrDnB=0).
Power Management Modes
State
Normal
PwrDnB
StopB
1
1
0
1
0
Clock Off
Powerdown
X
Table 6: Control Signals for Clock Source States
Upon applying power to the device, the device can enter any state, depending on the settings of the control signals,
PwrDnB and StopB. the clock source output need not be glitch-free during state transitions.
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
http://www.imicorp.com
Rev.1.3
9/7/1999
Page 7 of 17
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