主权项 |
1. A system comprising a plurality of devices that are series-connected and a controller configured to control operations of the plurality of devices, the operation of the plurality of devices being synchronized with a clock signal, each of the plurality of devices comprising:
a phase-locked loop (PLL) configured to be selectively enabled, the PLL providing a plurality of reproduced clock signals in response to an input clock signal while enabled in response to an enable signal, the reproduced clock signals being differently phase shifted versions of the input clock signal; a holder for holding identification information associated with the device, the identification information be used for identifying the device in the plurality of series-connected devices; an identification information provider configured to provide the identification information to the holder; a signal provider configured to provide a control signal in response to the identification information held in the holder, the control signal being one of logic high and low levels causing the PLL to be enabled and disabled, respectively; access circuitry configured to access a memory based on the identification information, data read from the accessed memory being provided; and synchronization circuitry for synchronizing the transfer of the data to a subsequent device of the plurality of devices with at least one of the reproduced clock signals, the plurality of devices being divided to a plurality of groups, in each group, at least one of the devices receiving the reproduced output clock signal from a previous device of the plurality of devices, the other devices receiving a common clock signal, the PLL of the device outputting the reproduced clock signals being enabled, the PLL of the other devices being disabled. |