Freescale Semiconductor MPC8250, Family Reference Manual

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G2 Core
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
2-14 Freescale Semiconductor
2.3.1.2.2 Hardware Implementation-Dependent Register 1 (HID1)
The PowerQUICC II implementation of HID1 is shown in Figure 2-4 .
Table 2-2 shows the bit definitions for HID1.
2.3.1.2.3 Hardware Implementation-Dependent Register 2 (HID2)
The processor core implements an additional hardware implementation-dependent register, shown in
Figure 2-5 .
Table 2-3 describes the HID2 fields.
29–30 — Reserved
31 NOOPTI No-op the data cache touch instructions.
0 The
dcbt and dcbtst instructions are enabled.
1 The dcbt and dcbtst instructions are no-oped globally.
1
See Chapter 10, “Power Management,” of the G2 Core Reference Manual for more information.
2
See Chapter 4, “Instruction and Data Cache Operation,” of the G2 Core Reference Manual for more information.
0 4 5 31
PLLCFG —
Figure 2-4. Hardware Implementation-Dependent Register 1 (HID1)
Table 2-2. HID1 Field Descriptions
Bits Name Function
0–4 PLLCFG PLL configuration setting. These bits reflect the state of the PLL_CFG[0:4] signals.
5–31 — Reserved
0 14 15 16 18 19 23 24 26 27 31
— SFP IWLCK — DWLCK —
Figure 2-5. Hardware Implementation-Dependent Register 2 (HID2)
Table 2-3. HID2 Field Descriptions
Bits Name Function
0–14 — Reserved
15 SFP Speed for low power. Setting SFP reduces power consumption at the cost of reducing the maximum
frequency, which benefits power-sensitive applications that are not frequency-critical.
16–18 IWLCK Instruction cache way lock. Useful for locking blocks of instructions into the instruction cache for
time-critical applications that require deterministic behavior. See
Section 2.4.2.3, “Cache Locking.”
19–23 — Reserved
Table 2-1. HID0 Field Descriptions (continued)
Bits Name Description