IBM 970MP - page 17

Application Note
(Includes Differences for 970FX to 970MP)
Preliminary IBM PowerPC® 970MP RISC Microprocessor
AppNote_970FX-MP_Differences_Body.fm.1.0
November 15, 2006
5. Design Enhancements for PowerPC 970MP
Page 17 of 25
5.3 PowerTuning
5.3.1 Power Modes
The twelve power states associated with the power tuning engine frequency scaling facility on the 970MP are
indicated by the nodes S1 through S12 in Figure 5-2.
The state diagram in Figure 5-2 represents two changes for the 970MP design. First, the Deep Nap state can
be reached from the Nap state at any frequency. Second, frequency scaling between full and quarter
frequency can be done directly.
Figure 5-2. 970MP Power Modes
High
Speed
Medium
Speed
Low
Speed
Deep
Nap
Doze NapRun
S1
S2
S4
S5
S6 S7
S9
S10
S12
R13
R12R10
L18
L15/R15
L14/R14
R17
L11L8/R8
L7/R7
R6
L2/R2
L1/R1 S3
S8
S11
L4
R3 R5
L9/R9
L21/R21
L16/R16
R19
R20