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The '''Broadway''' is the Wii's main CPU. It is a 32-bit PowerPC CPU based on the PowerPC 750CL. It is based on the GameCube [[Gekko]] CPU design, being almost identical other than an overclock and the addition of the HID4 register.
+The '''Broadway''' is the Wii's main CPU. It is a 32-bit PowerPC CPU based on the PowerPC 750CL. It is based on the GameCube [[Gekko]] CPU design, being almost identical other than an overclock and the addition of a few new features.
−== Versions ==
+== New features from Gekko ==
+(following text copied from official document "Summary of changes to Gekko User's Manual to turn it into a Broadway User's Manual")
−* DD1.0
+The major changes from Gekko to Broadway, covered in the UM are:
−* DD1.01
+* DD1.2
+* 1) L2 cache configurable for 32-B fetch mode, 64B-fetch mode or 128B-fetch mode
−* DD1.3
+* 2) Deeper pipelining on the 60x bus, programmable to max depth of 2, 3 or 4
−* DD2.0 (final)
+* 3) Number of BATs is increased from 4 to 8 each for I and D
+* 4) Addition of the HID4 register (SPRN = 1011) to control the new features.
+* 5) TAU functionality is eliminated (but the THRM1-3 regs remain)
+* 6) PLL configuration (processor-to-bus frequency ratio) expanded
+* 7) Several changes to the signal pins - DRTRY, TLBISYNC, PLL_CFG[4]
+* 8) Several Gekko errata are fixed on Broadway.
+* 9) The PVR is initially 0x00087100 on Broadway.
+==Versions==
+*DD1.0
+*DD1.01
+*DD1.2
+*DD1.3
+*DD2.0 (final)
Source: clkspeed.dol in [[RVL_UJI_DIAG]]
Source: clkspeed.dol in [[RVL_UJI_DIAG]]
