flip flop 464 is latched into flip flop 465 with the rising edge of the pll clock the exclusive or gate 466 is connected to output of flip flops 464 and 465 and is used to determine when the state of flip flops 464 and 465 outputs are not equal indicating a transition in the efm signal the output of the exclusive or gate 466 is latched on the rising edge of the pll clock into the flip flop 467 the output of flip flop 467 is latched into flip flop 468 on the rising edge of the pll clock the output of flip flop 468 is latched into flip flop 469 on the rising edge of the pll clock the output of flip flop 469 is latched into flip flop 470 on the rising edge of the pll clock the output of flip flop 470 is latched into flip flop 472 on the rising edge of the pll clock the output of flip flop 472 is latched into flip flop 473 on the rising edge of the pll clock the output of flip flop 473 is latched into flip flop 474 on the rising edge of the pll clock the output of flip flop 474 is latched into flip flop 475 on the rising edge of the pll clock the output of flip flop 475 is latched into flip flop 477 on the rising edge of the pll clock the output of flip flop 477 is latched into flip flop 478.