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Processor: Processor Initialization
Katana
®
752i User’s Manual 10006024-04
4-6
BTIC: Branch Target Instruction Cache enable.
ABE: Address Broadcast Enable (for cache ops, eieio, sync).
BHT: Branch History Table enable.
NOOPTI: No-op the dcbt/dcbst instructions.
Hardware Implementation Dependent 1 Register
The 750GL includes two phase-lock loops (PLL0 and PLL1), which allow the processor clock
frequency to be changed to one of the PLL frequencies via software control. The HID1 regis-
ter contains:
• Fields that specify the frequency range of each PLL
• The clock multiplier of each PLL
• External or internal control of PLL0
• A bit to choose which PLL is selected (source of the processor clock at any given time):
Register 4-2: 750GL Hardware Implementation Dependent, HID1
PCE: PLL External Configuration bits (read only).
PRE: PLL External Range bits (read only).
PSTAT1: PLL Status (not supported in DD1.x).
0 = PLL0 is the processor clock source
1 = PLL1 is the processor clock source
ECLK: Enable the CLKOUT pin (set to 1).
PI0: PLL 0 Internal configuration select.
0 = Select external configuration and range bits to control PLL0
1 = Select internal fields in HID1 to control PLL0
PS: PLL Select.
0 = Select PLL0 as source for processor clock
1 = Select PLL1 as source for processor clock
PC0: PLL0 Configuration bits.
0456789131415
PCE PRE PSTAT1 ECLK Reserved PI0 PS
16 20 21 22 23 24 28 29 30 31
PC0 PR0 Res. PC1 PR1 Res.