Patent ID: 7546397
Filing Date: 2009-06-09
Classification: G11B

Abstract:
1. A system, comprising: a plurality of devices configured to be located on an optical pick-up unit (OPU), with each device including wherein the DSRs of the plurality of devices share a common multi-bit address that is addressable in a same manner as the registers that are not the DSR; wherein the plurality of serial interfaces of the plurality of devices are configured to be connected to the same serial enable (SEN) line, the same serial clock (SCLK) line and the same serial data input/output (SDIO) line; wherein the plurality of serial interfaces are collectively enabled and collectively disabled via the SEN line; wherein only one of the plurality of serial interfaces can be selected at one time, with the remaining of the plurality of serial interfaces being deselected; wherein the serial interface of a said device is selected when the DEN of the device is the same as the content of the at least one register designated the DSR of the device; wherein the serial interface of a said device is deselected when the DEN of the device is not the same as the content of the at least one register designated the DSR of the device; wherein each said serial interface of each said device, in response to receiving a write command to the DSR of the device, will write to the DSR, thereby enabling changing of which one said serial interface is selected; wherein once the serial interface of a said device is selected, the selected serial interface remains selected until a write command is used to change the content of the at least one register designated the DSR of the device so that the DEN of the device is no longer the same as the content of the at least one register designated the DSR of the device; wherein while the serial interface of a said device remains selected, data can be written to the registers of the device including the registers that are not the DSR in response to write commands being received by the serial interface of the device; and wherein while the serial interface of a said device remains selected, data can be read from the registers of the device including the registers that are not the DSR in response to read commands being received by the serial interface of the device.