MPC8349AEC Rev. 13 "Hardware Specification" "Table 57. Operating Frequencies for TBGA" mentions that the maximum "Local bus frequency (LCLKn)" for a 533 MHz device is 133 MHz. However, LCLKn is obtained by a 1/2, 1/4 or 1/8 factor from lbiu_clk (also called lbc_clk). It is not possible to find in the documentation what is the maximum frequency of lbiu_clk (lbc_clk). Nothing in the documentation prevents setting lbiu_clk to 533 MHz by using RCWL[LBIUCM]=1 with a csb_clk of 266 MHz, while maintaining the local bus frequency to 133 MHz by using a LCRR[CLKDIV]=4.
If possible, what is the difference between the following two configurations? Will it increase performance?
1- 266 MHz csb_clk, 133 MHz local bus frequency, 266 MHz lbiu_clk
2- 266 MHz csb_clk, 133 MHz local bus frequency, 533 lMHz biu_clk