JP2013239027A - Semiconductor integrated circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a semiconductor integrated circuit device requiring a plurality of power supplies, which has a configuration allowing for an adjustable semiconductor integrated circuit device, by establishing a single power supply.SOLUTION: A device part including a controller circuit MCU operates on a voltage from a power supply system A, and a device part including a first circuit 11 operates on another voltage from a power supply system B. In a semiconductor integrated circuit device 10, the device part is configured by separating the device 10 from the aspect of function. The power supply system of the device 10 is also separated according to this separation. The operation of the controller circuit for controlling the device 10 can be performed by only establishing a first power supply system A. The processing of the semiconductor integrated circuit device 10 having such hardware configuration is separated to configure initialization processing means 21 and main processing means 23. This enables the controller circuit MCU to avoid initialization operation of the first circuit 11 in which establishment of a second power supply system B is unknown, and to perform self-adjustment operation without establishing the second power supply system B.

Description

  The present invention relates to a semiconductor integrated circuit device.

  Patent document 1 provides a semiconductor device. This semiconductor device can initialize the internal circuit normally without being affected by the power-up sequence and timing, and suppresses the through current at the time of power-up and power-down. The internal power supply detection circuit detects that the internal power supply generation circuit that operates the internal circuit has reached a voltage that enables the internal circuit to operate. The power supply detection circuit detects that the power supply has reached a voltage that enables the reset circuit and the interface 1 circuit to operate. From the detection signal of the internal power supply detection circuit and the detection signal of the IO1 power supply detection circuit, the input / output permission signal generation circuit generates an input / output permission signal.

JP 2007-251738 A

  A certain type of semiconductor integrated circuit device includes a device portion related to a controller circuit that controls the semiconductor integrated circuit device, and a device portion that receives a control signal for initialization from a circuit related to the controller circuit. The device unit including the controller circuit can operate at a relatively low voltage by taking advantage of miniaturization of semiconductor manufacturing. On the other hand, another device unit different from this device unit operates with another different power supply system for causing another device unit to have a function specific to each application. As described above, when the semiconductor integrated circuit device uses at least the power supply system of the first power supply line and the power supply system of the second power supply line, in general, the establishment of all these power supply systems is necessary for the operation of the semiconductor integrated circuit device. is necessary. On the other hand, some semiconductor integrated circuit devices require adjustment for control specific to the semiconductor integrated circuit device to the controller circuit device unit. This adjustment is performed, for example, in the manufacturing process of the semiconductor integrated circuit device.

  Even when a device that requires a power supply of two or more voltages (for example, 5 volts and 3.3 volts), for example, an optical transceiver, includes a microcontroller circuit (MCU) that is driven by one voltage, If you want to operate the microcontroller circuit to access the ROM (for example, read from or write to ROM), prepare the power supply for all the voltages (for example, two or more) required by the device. The ROM is accessed while operating in the operation mode.

  What is needed is to make adjustments for control inherent in a semiconductor integrated circuit device possible by establishing fewer power sources in the manufacturing process.

  The present invention has been made in view of such circumstances, and has a configuration that enables adjustment of a semiconductor integrated circuit device by establishing a single power supply in a semiconductor integrated circuit device that requires a plurality of power supplies. An object of the present invention is to provide a semiconductor integrated circuit device.

  A semiconductor integrated circuit device according to the present invention includes: (a) a microcontroller circuit connected to a first power supply line that supplies power of a first voltage; and (b) a second voltage that supplies a second voltage different from the first voltage. And a first circuit that is connected to two power supply lines and that can be initialized in response to an initialization signal from the microcontroller circuit. The microcontroller circuit includes an AD converter for monitoring the voltage of the second power supply line, an electrically rewritable nonvolatile memory for storing adjustment data and a program of the semiconductor integrated circuit device, and the program A central processing unit that operates; and a storage unit, wherein the microcontroller circuit includes an initialization processing unit and a main processing unit, and the initialization processing unit is configured such that a monitor signal from the AD converter is supplied to the second power supply line. Performing a first detection of whether power is established and if the first detection indicates that the power of the second power line is not established, without initializing the first circuit; Control is transferred from the initialization processing means to the main processing means, and the main processing means indicates that the first detection indicates that the power supply of the second power supply line is not established. The semiconductor integrated circuit device can be adjusted, and the main processing means performs a second detection of whether or not the power supply of the second power supply line is established based on a monitor signal from the AD converter. In addition, when the second detection indicates that the power supply of the second power supply line is not established, the process returns to the execution of the second detection, and the initialization processing means determines that the first detection is the second detection. When it indicates that the power supply of the power supply line has been established, a control signal for initializing the first circuit is generated.

  The semiconductor integrated circuit device includes a device unit related to a controller circuit that controls the semiconductor integrated circuit device, and another device unit including a first circuit that receives a control signal for initialization from the circuit related to the controller circuit. Prepare. The device unit including the controller circuit operates at a certain voltage, while another device unit different from the device unit operates with a different power supply system for causing the other device unit to function. Thus, when the semiconductor integrated circuit device uses at least the power supply system of the first power supply line and the power supply system of the second power supply line, it is necessary to establish all these power supply systems for the operation of the semiconductor integrated circuit device. . On the other hand, these device units are separated from the function side, and the operation of the controller circuit device unit that controls the semiconductor integrated circuit device when the power supply system is also separated with respect to these function units. Can be executed only by establishing the first power supply system without requiring establishment of all the power supply systems. In the semiconductor integrated circuit device having such a hardware configuration, the controller circuit device unit can determine whether the second power supply system has been established by separating the processing in the initialization processing unit and the processing in the main processing unit. While avoiding the initialization operation of the circuit and monitoring the establishment of the second power supply system, another operation that does not require the establishment of the second power supply system becomes possible.

  In the semiconductor integrated circuit device according to the present invention, the main processing means changes from the main processing means to the initialization processing means when the second detection indicates that the power supply of the second power supply line is established. The control is transferred, and the initialization processing means can generate a control signal for initializing the first circuit when the control is transferred from the main processing means to the initialization processing means.

  According to this semiconductor integrated circuit device, when it is detected that the power source of the second power supply line has been established even after the control is once transferred to the main processing means, the control is transferred from the main processing means to the initialization processing means. The initialization processing means prepares for initializing the first circuit and generates a control signal.

  In the semiconductor integrated circuit device according to the present invention, the main processing means shifts control from the initialization processing means to the main processing means, and then performs adjustment for control specific to the semiconductor integrated circuit device. The adjustment can be performed on the circuit only by establishing the first power supply line, and the adjustment can be performed in the manufacturing process of the semiconductor integrated circuit device.

  In this semiconductor integrated circuit device, adjustment for control specific to the semiconductor integrated circuit device is performed on the controller circuit device only by establishing the first power supply line in the manufacturing process of the semiconductor integrated circuit device.

  The semiconductor integrated circuit device according to the present invention can further include an interface circuit connected to the microcontroller circuit. The main processing means changes the data in the nonvolatile memory in the microcontroller circuit using the interface circuit when the second detection indicates that the power supply of the second power supply line is not established. It is preferable.

  In this semiconductor integrated circuit device, the microcontroller circuit is placed in an operation mode in which the nonvolatile memory is written when the initialization processing unit detects that the power supply of the second power supply line is not established. Write data is provided via an interface circuit connected to the microcontroller circuit. The semiconductor integrated circuit device can perform the above adjustment without requiring establishment of all power supply systems. When this interface circuit requires power, the interface circuit is connected to the first power supply line.

  In the semiconductor integrated circuit device according to the present invention, it is preferable that the first circuit includes a control circuit for optical transmission. The semiconductor integrated circuit device further includes a laser drive circuit controlled by the control circuit, a laser diode that receives a drive signal from the laser drive circuit, and an optical waveguide that receives an optical signal from the laser diode. it can. The laser drive circuit and the laser diode are preferably connected to the second power supply line.

  In this semiconductor integrated circuit device, it is not necessary to establish all the power sources for the semiconductor integrated circuit device when making adjustments in the manufacturing process of the optical transmission module.

  In the semiconductor integrated circuit device according to the present invention, it is preferable that the first circuit includes a control circuit for optical reception. The semiconductor integrated circuit device may further include an optical waveguide, a photodiode that receives an optical signal from the optical waveguide, and a signal processing circuit that processes an electrical signal from the photodiode. It is preferable that the photodiode and the signal processing circuit are connected to the second power supply line.

  In this semiconductor integrated circuit device, it is not necessary to establish all the power sources for the semiconductor integrated circuit device when making adjustments in the manufacturing process of the optical receiver module.

  In the semiconductor integrated circuit device according to the present invention, in the initialization processing means, a first detection result as to whether or not the power supply of the second power supply line is established is stored in the storage means as a determination flag, and the determination flag This value can be transferred from the initialization processing means to the main processing means and held in the main processing means when the processing is transferred from the initialization processing means to the main processing means.

  In this semiconductor integrated circuit device, while the detection result of the initialization processing means is held in the main processing means, the processing in the main processing means is performed and the establishment of the power source is monitored, and the initialization processing means is processed according to the monitoring result Can be returned.

  In the semiconductor integrated circuit device according to the present invention, in the main processing means, when the value of the determination flag indicates that the power supply of the second power supply line is not established, the first processing unit is based on the monitor signal from the AD converter. Detecting whether or not the power supply of the two power supply lines is established, and when the detection indicates that the power supply of the second power supply line is established, the initial value is sent from the main processing means regardless of the value of the determination flag. After returning the processing to the conversion processing means and taking over the processing from the main processing means, the initialization processing means detects whether the power supply of the second power line is established based on the monitor signal from the AD converter It is preferable that the value of the determination flag is changed based on the detection and the first circuit is initialized.

  In this semiconductor integrated circuit device, the main processing means can perform different processing depending on the value of the determination flag. When the value of the determination flag indicates that the power supply of the second power supply line is not established, it is detected whether or not the power supply of the second power supply line is established, and this detection establishes the power supply of the second power supply line. When this is shown, the process returns from the main processing means to the initialization processing means without changing the value of the determination flag, and the initialization processing means changes the value of the detection flag and performs initialization.

  In the semiconductor integrated circuit device according to the present invention, the microcontroller circuit has a port capable of executing either input or output of a signal, and the main processing means sets the port according to the value of the determination flag. It is preferable to operate.

  In the semiconductor integrated circuit device according to the present invention, when the value of the determination flag indicates that the power supply of the second power supply line is established, the main processing means monitors the establishment of the power supply of the second power supply line. The processing in the main processing means can be repeated without any problem.

  This semiconductor integrated circuit device monitors an interrupt request to a central processing unit, for example.

  The above and other objects, features, and advantages of the present invention will become more readily apparent from the following detailed description of preferred embodiments of the present invention, which proceeds with reference to the accompanying drawings.

  As described above, according to the present invention, there is provided a semiconductor integrated circuit device having a configuration that enables adjustment of a semiconductor integrated circuit device by establishing a single power source in a semiconductor integrated circuit device that requires a plurality of power supplies. Is done.

FIG. 1 is a drawing showing a semiconductor integrated circuit device according to the present embodiment. FIG. 2 is a flowchart showing the control in the functional block. FIG. 3 is a drawing schematically showing means for achieving the processing in the semiconductor integrated circuit device. FIG. 4 is a drawing schematically showing means for achieving the processing in the semiconductor integrated circuit device.

  The knowledge of the present invention can be easily understood by considering the following detailed description with reference to the accompanying drawings shown as examples. Subsequently, embodiments of the semiconductor integrated circuit device of the present invention will be described with reference to the accompanying drawings. Where possible, the same parts are denoted by the same reference numerals.

  FIG. 1 is a diagram showing a semiconductor integrated circuit device according to the present embodiment. Part (a) of FIG. 1 schematically shows a hardware block of the semiconductor integrated circuit device, and part (b) of FIG. 1 schematically shows a functional block. The semiconductor integrated circuit device 11 includes a first power supply line A that supplies power of a first voltage, a second power supply line B that supplies a second voltage different from the first voltage, a microcontroller circuit MCU, and a first circuit 10. With. The first circuit 10 is connected to a second power supply line B that supplies a second voltage different from the first voltage, and can be initialized in response to an initialization signal from the microcontroller circuit MCU. The microcontroller circuit MCU is connected to a first power supply line A that supplies power of a first voltage, and operates by receiving power supply from the first power supply line A.

  The microcontroller circuit MCU includes an AD converter 13 for monitoring the voltage of the second power supply line B, an electrically rewritable nonvolatile memory 15 for storing adjustment data and a program of the semiconductor integrated circuit device 10, A central processing unit 17 that operates according to the program and storage means 19 such as a ROM, a RAM, and a register are included.

  When the first power supply line A is supplied to the semiconductor integrated circuit device 10, the microcontroller circuit MCU is operable by receiving power supply from the first power supply line A. The microcontroller circuit MCU is initialized by the establishment of the first power supply line A. This initialization is performed by a power supply detection circuit built in the microcontroller circuit MCU or a reset element provided outside the microcontroller circuit MCU. When the initialization of the microcontroller circuit MCU is completed, the microcontroller circuit MCU executes a predetermined program.

  The microcontroller circuit MCU includes an initialization processing means 21 and a main processing means 23 as functional blocks as shown in part (b) of FIG. FIG. 2 shows a flow for control in the functional block.

  After the microcontroller circuit MCU is properly activated in step S101, the initialization processing means 21 performs a first detection as to whether or not the monitor signal from the AD converter 13 has established the power supply of the second power supply line B. Run. For this first detection, the monitor value is taken from the AD converter 13 in step S102, the first detection is performed in step S103, and the determination flag F is set. When the first detection indicates that the power supply of the second power supply line B is not established, a first value, for example, “1” is set to the determination flag in step S104.

  On the other hand, when the first detection indicates that the power supply of the second power supply line B is established, the initialization processing unit 21 sets a determination flag to a second value different from the first value, for example, “ In step S109, the first circuit 10 is initialized.

  When the determination flag is “1”, the predetermined value of the microcontroller circuit MCU transfers control from the initialization processing unit 21 to the main processing unit 23 without initializing the first circuit 10. The main processing unit 23 can adjust the semiconductor integrated circuit device 10 when the first detection indicates that the power supply of the second power supply line B is not established, and this adjustment processing is performed in step S105.

  In the semiconductor integrated circuit device 11, the main processing unit 23 transfers control from the initialization processing unit 21 to the main processing unit 23, and then makes adjustments for control specific to the semiconductor integrated circuit device 11 in the microcontroller circuit MCU. Do. This adjustment process can be executed only by establishing the first power supply line A, and the adjustment process can be performed, for example, in the manufacturing process of the semiconductor integrated circuit device.

  In this semiconductor integrated circuit device 11, when adjustment for control specific to the semiconductor integrated circuit device 11 is performed on the controller circuit device section only by establishing the first power supply line A in the manufacturing process of the semiconductor integrated circuit device 11, The adjustment processing 25 in the main processing means 23 includes writing to the nonvolatile memory 15 such as an EEPROM, interrupt processing, and the like.

  The main processing means 23 executes a second detection process as to whether or not the power supply of the second power supply line B is established based on the monitor signal (monitor value) from the AD converter 13. For the second detection process, the monitor value is taken from the AD converter 13 in step S106, and the second detection is performed in step S107.

  When the second detection indicates that the power supply of the second power supply line B has not been established, the process returns to the execution of the second detection process. For example, for this purpose, control is transferred to the head of the main processing means 23 via the control path BK2.

  Further, when the second detection indicates that the power supply of the second power supply line B is established, the control is transferred from the main processing means 23 to the initialization processing means 21 via the control path BK1.

  The semiconductor integrated circuit device 10 includes a device unit related to the controller circuit MCU that controls the semiconductor integrated circuit device 10 and a first circuit 11 that receives a control signal for initialization from the circuit related to the controller circuit MCU. The apparatus part is provided. The device unit including the controller circuit MCU operates with a certain voltage from the power supply system A, while another device unit (for example, the first circuit 11) different from the device unit functions to make the other device unit function. It operates with a different power supply system B.

  In a semiconductor integrated circuit device using at least the power supply system of the first power supply line A and the power supply system of the second power supply line B, it is generally necessary to establish all these power supply systems A and B for the operation of the semiconductor integrated circuit device. It is. However, in the semiconductor integrated circuit device 11, the semiconductor integrated circuit device 11 is separated from the function side and these device portions are defined. In accordance with the separation of the functions, the power supply system is separated for each device unit (for example, the microcontroller circuit MCU operates only with the first power supply system, the first circuit 11 operates only with the first power supply system, or the first power supply system). And the operation of the second power supply system), the operation of the controller circuit device unit for controlling the semiconductor integrated circuit device 11 is executed only by establishing the first power supply system A without requiring establishment of all the power supply systems. It becomes possible. In the semiconductor integrated circuit device 11 having such a hardware configuration, the controller circuit device section establishes the second power supply system B by separating the processing in the initialization processing means 21 and the processing in the main processing means 23. It is possible to perform an original operation that does not require the establishment of the second power supply system B while avoiding the initialization operation of the unknown first circuit 11 and monitoring the establishment of the second power supply system B.

  In the semiconductor integrated circuit device 10, the main processing unit 23 performs initialization processing from the main processing unit 23 via the control path BK1 when the second detection indicates that the power of the second power supply line B is established. Control is transferred to means 21. The initialization processing unit 21 can generate a control signal for initializing the first circuit 11 when the control is transferred from the main processing unit 23 to the initialization processing unit 21. In initialization of the first circuit 11, for example, a second value, for example, “0” is set in the determination flag in step S108. In step S109, a control signal for initializing the first circuit 11 is generated.

  According to this semiconductor integrated circuit device 11, when it is detected that the power supply of the second power supply line B has been established even after the control has once shifted to the main processing means 23, the control is initialized from the main processing means 23. Control is transferred to the means 21, and the initialization processing means 21 prepares for initializing the first circuit 11 (for example, steps S103 and S108) and generates a control signal (for example, step S109).

  The semiconductor integrated circuit device 11 can further include an interface circuit 31 connected to the microcontroller circuit MCU. When the second detection indicates that the power supply of the second power supply line B has not been established, the main processing means 23 takes in data from the outside using the interface circuit 31 and stores the nonvolatile data in the microcontroller circuit MCU. The stored contents of the memory 15 can be changed.

  In the semiconductor integrated circuit device 11, the microcontroller circuit MCU writes the nonvolatile memory 15 in step S114 when the initialization processing unit 21 detects that the power supply of the second power supply line B is not established. Put into operation mode. Write data is provided via an interface circuit 31 connected to the microcontroller circuit MCU. The semiconductor integrated circuit device 11 can perform the above-described device adjustment without requiring establishment of all the power supply systems A and B. When the interface circuit 31 requires a power source, the interface circuit 31 can be included in a device unit connected to the first power line A.

  Such a semiconductor integrated circuit device 10 is applied to an optical communication device such as an optical transmitter, an optical receiver, and an optical transceiver.

  The first circuit 11 preferably includes a control circuit 33 for optical transmission. The semiconductor integrated circuit device 10 includes a laser drive circuit LDD controlled by the control circuit 33, an optical transmission subassembly TOSA including a laser diode LD that receives a drive signal from the laser drive circuit LDD, and an optical signal from the laser diode LD. An optical waveguide FB1 such as an optical fiber that receives LBOUT can be further provided. The laser drive circuit LDD and the laser diode LD are connected to the second power supply line B. The laser driving circuit LDD provides an LD current SD and a modulation signal SM to the laser diode LD. The microcontroller circuit MCU controls the laser drive circuit LDD as follows (for example, writing of a set value corresponding to a temperature monitor value, reading of a Fault signal from the LDD). The optical transmitter or the optical transceiver can include a TEC power supply 35 controlled by a microcontroller circuit MCU, and the TEC power supply 35 operates in response to a signal (for example, an LD temperature signal) ST from the optical transmission subassembly TOSA. Connected to the TEC drive circuit 37. The TEC drive circuit 37 supplies a TEC current to control the temperature of the Peltier element in the optical transmission subassembly TOSA. The microcontroller circuit MCU controls the TEC power supply 35 such as setting a value according to the temperature monitor value and inputting a TEC enable signal.

  In the semiconductor integrated circuit device 10 for an optical transmitter or optical transmitter / receiver, all adjustments for the semiconductor integrated circuit device 10 are performed during adjustment (for example, change of the nonvolatile memory in step S114) in the manufacturing process of the optical transmission module. Does not require the establishment of a power source.

  In the semiconductor integrated circuit device 10, the first circuit 11 preferably includes a control circuit 39 for optical reception. The semiconductor integrated circuit device 10 includes an optical waveguide FB2 such as an optical fiber, a photodiode PD that receives an optical signal LBIN from the optical waveguide FB2, and a signal processing that processes an electrical signal SROUT (for example, a differential signal) from the photodiode PD. A circuit 41 can be further provided. The signal processing circuit 41 includes a clock data recovery circuit CDR, a limiting amplifier LIA, and the like. The photodiode LD and the signal processing circuit 41 are connected to the second power supply line B.

  In the semiconductor integrated circuit device 10 for an optical transmitter or optical transmitter / receiver, it is not necessary to establish all the power sources for the semiconductor integrated circuit device 10 when making adjustments in the manufacturing process of the optical receiver module.

  In the semiconductor integrated circuit device 10, the initialization processing unit 21 stores the first detection result as to whether or not the power supply of the second power supply line B is established in the storage unit 19 as a determination flag, and the value of the determination flag is When the processing is transferred from the initialization processing unit 21 to the main processing unit 23, it can be transferred from the initialization processing unit 21 to the main processing unit 23 and held in the main processing unit 23. In this semiconductor integrated circuit device 11, while the detection result in the initialization processing unit 21 is held in the main processing unit 23, the establishment of the power supply is monitored while performing the processing in the main processing unit 23, and initialization is performed according to the monitoring result The processing can be returned to the processing means 21.

  As already described, in the initialization processing unit 21 and the main processing unit 23, the determination flag stored in the storage unit 19 can be used to transmit the status indicating the power supply establishment. The determination flag F is set by the initialization processing unit 21, is used for processing in the main processing unit 23, and is not changed in the main processing unit 23.

  In the semiconductor integrated circuit device 10, when the value of the determination flag set in the initialization processing unit 21 indicates that the power supply of the second power supply line is not established, for example, when the determination flag is 1, the main processing unit 23 Based on the monitor signal from the AD converter 15, it is determined whether or not the power supply of the second power supply line B is established. When the detection in the main processing means 23 indicates that the power supply of the second power supply line B has been established, the processing is returned from the main processing means 23 to the initialization processing means 21 via the path FB2 regardless of the value of the determination flag. After accepting the processing from the main processing means 23, the initialization processing means 21 again detects whether or not the power supply of the second power supply line B is established based on the monitor signal from the AD converter 13. Based on this detection, it is preferable to change the value of the determination flag and initialize the first circuit 10.

  In the semiconductor integrated circuit device 10, the main processing unit 23 can perform different processes according to the value of the determination lag. When the value of the determination flag indicates that the power supply of the second power supply line B is not established, the main processing means 23 detects whether or not the power supply of the second power supply line B is established, and this detection Indicates that the power supply of the second power supply line B has been established, the process returns from the main processing means 23 to the initialization processing means 21 without changing the value of the determination flag, and the initialization processing means 21 sets the value of the determination flag. Is changed and initialization is performed. The reason why the value of the determination flag is not changed by the main processing means is that the power supply voltage B is determined at the time of initialization and the determination flag is reset.

  In the semiconductor integrated circuit device 11, the microcontroller circuit MCU has a port that can execute either input or output of a signal. The main processing unit 23 preferably operates the port according to the value of the detection flag.

  In the semiconductor integrated circuit device 11, when the value of the determination flag indicates that the power supply of the second power supply line B is not established, the main processing unit 23 does not repeatedly monitor the establishment of the power supply of the second power supply line B. The processing in the main processing means 23 can be repeated via the route BK2. In this repetition, monitoring of the establishment of the power supply of the second power supply line B is skipped in accordance with the determination regarding the value of the determination flag in step S110. Further, in this repetition, monitoring of various monitors (for example, temperature / power supply voltage / TxBias / TxPower / RxPower) can be performed in step S111, and periodic setting processing (for example, setting to DAC and transceiver IC) Can be performed in step S112. Further, in this repetition, the interrupt request processing can be performed in step S113. The semiconductor integrated circuit device 10 can monitor an interrupt request to the central processing unit CPU, for example.

  FIG. 3 is a drawing schematically showing means for achieving the processing in the semiconductor integrated circuit device 10 described above.

  The initialization processing unit 21 includes a first monitoring unit 51, a first determination unit 52, a first storage unit 53, a generation unit 54, a first control unit 55, a second storage unit 56, and a second control unit 57. it can. In the initialization processing means 21, the first monitor means 51 is provided for generating a monitor value from monitoring the voltage of the second power supply line B using the AD converter 13. The first determination unit 52 is provided to make a first determination as to whether the voltage of the second power supply line B has been established based on the monitor value in the first monitor unit 51. The first storage means 53 stores, in the storage means 19, a value indicating that the detection is positive when the first determination in the first determination means 52 is affirmative, that is, when the power source is established. Provided for. The generation unit 54 is provided to generate an instruction signal for initializing the first circuit 10 when the first determination in the first determination unit 52 is affirmative. The first control means 55 is provided to transfer the processing from the initialization processing means 21 to the main processing means 23 when the first determination in the first determination means 52 is affirmative. The second storage means 56 stores, in the storage means 19, a value indicating that the detection is negative when the first determination in the first determination means 52 is negative, that is, when the power source is not established. Provided for. The second control unit 57 is provided to transfer the processing from the initialization processing unit 21 to the main processing unit 23 when the first determination in the first determination unit 52 is negative.

  In this semiconductor integrated circuit device 10, when the voltage of the second power supply line B is established using a part or all of the above means, the initialization process of the first circuit 11 and the second power supply line B The value for the processing in the case where the voltage is not established and the processing in the main processing means 23 to which the processing is transferred from the initialization processing means 21 can be stored in the storage means 19.

  FIG. 4 is a drawing schematically showing means for achieving the processing in the semiconductor integrated circuit device 10 described above. The main processing unit 23 includes a second determination unit 61, a second monitor unit 62, a third determination unit 63, a second control unit 64, and a third control unit 65. In the main processing means 23, the second determination means 61 is provided for reading the value in the storage means 19 and making a second determination regarding the branching of processing in the main processing means 23 based on the detection in the initialization processing means 21. (Step S110). The second monitor unit 62 uses the second power source using the AD converter 13 when the second determination unit 61 indicates that the second determination of the second determination unit is negative, that is, when the power source is not established. It is provided to generate a monitor value from monitoring the voltage on line B (step S106). The third determination unit 63 is provided to make a third determination as to whether the voltage of the second power supply line B has been established based on the monitor value in the second monitor unit 62 (step S107). The second control unit 64 is provided to transfer the processing from the main processing unit 23 to the initialization processing unit 21 when the third determination by the third determination unit 63 is affirmative, that is, when the power supply is established ( Path BK1). The third control unit 65 is provided to continue the processing in the main processing unit 23 when the third determination in the third determination unit 63 is negative, that is, when the power source is not established (path BK2). When the second determination in the second determination unit 61 is affirmative, that is, when the power source is already established, the fourth control unit 66 does not transfer the processing from the main processing unit 23 to the initialization processing unit 21. Provided to continue the processing by the main processing means 23 (path BK2).

  In the semiconductor integrated circuit device 10, the main processing unit 23 can perform the monitoring process and the main processing of the voltage of the second power supply line B according to the value read from the storage unit 19 using the above-described unit. .

  Usually, a device such as an optical transceiver includes a microcontroller circuit MCU that operates under a power source A, an optical communication subassembly (TOSA, ROSA) that operates under a power source B different from the power source A, and its peripheral circuits. Including. At the start-up of the device, the microcontroller circuit MCU may perform initialization processing for the peripheral circuits of the subassembly without waiting for the establishment of the power supply B after the power supply A is established. In such a case, there may be a problem that the processing (for example, main loop) in the main processing is not normally shifted.

  In order to avoid such a problem, the initialization process for the peripheral circuit of the sub-assembly can be performed after waiting for the establishment of both the power supply A and the power supply B. However, this process and method may require a waiting time for both power supplies to start up, and both power supplies are also used when writing to a nonvolatile memory such as an EEPROM in a production line that is not in normal operation. You need to stand up together. However, the preparation of a plurality of power sources is complicated in the manufacturing process.

  In the semiconductor integrated circuit device 10 according to the present embodiment, in the state where the power source A is established but the power source B is not established (that is, the state of the determination flag “1”), the circuit IC to be initialized Without performing the initialization process, the process shifts to the main process and executes the main loop. In this main processing, adjustment of the semiconductor integrated circuit device 10 (for example, writing of a nonvolatile memory) can be executed in the manufacturing process only by establishing the power source A. In the loop in the main process, the rise of the power supply B is monitored. When the power supply B is established as a result of this monitoring, the control returns to the initialization process, and then the circuit IC to be initialized is initialized. The processing is performed and the determination flag is set to “0”. After the initialization of the circuit IC is completed by the initialization process, the process proceeds to the main process. At this time, in the main process, since the power source B is established (that is, in the state of the determination flag “0”), for example, a predetermined loop is repeated in the main process so that the control remains in the main process. According to this processing flow, the semiconductor integrated circuit device 10 can be adjusted by establishing a single power source (for example, power source A) in the semiconductor integrated circuit device 10 that requires a plurality of power sources (for example, power sources A and B). A configuration is provided.

  In this embodiment, the semiconductor integrated circuit device of the optical communication device is exemplarily described. However, the semiconductor device operates with a plurality of power supplies, and the control circuit operates with one power supply among the plurality of power supplies ( This technique is useful when accessing MPU).

  While the principles of the invention have been illustrated and described in the preferred embodiments, it will be appreciated by those skilled in the art that the invention can be modified in arrangement and detail without departing from such principles. The present invention is not limited to the specific configuration disclosed in the present embodiment. We therefore claim all modifications and changes that come within the scope and spirit of the following claims.

  As described above, according to the present embodiment, in a semiconductor integrated circuit device that requires a plurality of power supplies, a semiconductor integrated circuit device having a configuration that enables adjustment of the semiconductor integrated circuit device by establishing a single power supply. Is provided.

DESCRIPTION OF SYMBOLS A ... 1st power supply line (power supply), B ... 2nd power supply line (power supply), 10 ... Semiconductor integrated circuit device, 11 ... 1st circuit, MCU ... Microcontroller circuit, 13 ... AD converter, 15 ... Non-volatile memory , 17 ... Central processing unit, 19 ... Storage means, 21 ... Initialization processing means, 23 ... Main processing means, 25 ... Adjustment processing, 31 ... Interface circuit, 33 ... Control circuit, LDD ... Laser drive circuit, LD ... Laser diode , TOSA optical transmission subassembly, FB1 optical waveguide, 35 TEC power supply, 37 TEC drive circuit, 39 control circuit, FB2 optical waveguide, PD photodiode, 41 signal processing circuit.

Claims (10)

A semiconductor integrated circuit device,
A microcontroller circuit connected to a first power supply line for supplying a power supply of a first voltage;
A first circuit connected to a second power supply line for supplying a second voltage different from the first voltage and capable of being initialized in response to an initialization signal from the microcontroller circuit;
With
The microcontroller circuit includes an AD converter for monitoring the voltage of the second power supply line, an electrically rewritable nonvolatile memory for storing adjustment data and a program of the semiconductor integrated circuit device, and the program A central processing unit that operates, and storage means,
The microcontroller circuit includes initialization processing means and main processing means,
The initialization processing means performs a first detection based on whether a monitor signal from the AD converter has established a power supply for the second power supply line, and the first detection is a power supply for the second power supply line. Indicates that the first circuit is not established, the control is transferred from the initialization processing means to the main processing means without performing initialization of the first circuit,
The main processing means adjusts the semiconductor integrated circuit device when the first detection indicates that the power supply of the second power supply line is not established,
The main processing means performs a second detection of whether or not the power supply of the second power supply line is established based on a monitor signal from the AD converter, and the second detection is performed on the second power supply line. If it indicates that power is not established, return to the execution of the second detection,
The initialization processing means generates a control signal for initializing the first circuit when the first detection indicates that the power supply of the second power supply line is established. . The main processing means shifts control from the main processing means to the initialization processing means when the second detection indicates that the power supply of the second power supply line is established,
2. The semiconductor according to claim 1, wherein the initialization processing unit generates a control signal for performing initialization of the first circuit when control is transferred from the main processing unit to the initialization processing unit. Integrated circuit device. The main processing means, after transferring control from the initialization processing means to the main processing means, performs adjustment for control specific to the semiconductor integrated circuit device on the microcontroller circuit. It can be executed only by establishing a power line,
The semiconductor integrated circuit device according to claim 1, wherein the adjustment is performed in a manufacturing process of the semiconductor integrated circuit device. An interface circuit connected to the microcontroller circuit;
The main processing means changes the data in the nonvolatile memory in the microcontroller circuit using the interface circuit when the second detection indicates that the power supply of the second power supply line is not established. A semiconductor integrated circuit device according to any one of claims 1 to 3. The first circuit includes a control circuit for optical transmission,
The semiconductor integrated circuit device further includes a laser drive circuit controlled by the control circuit, a laser diode that receives a drive signal from the laser drive circuit, and an optical waveguide that receives an optical signal from the laser diode,
5. The semiconductor integrated circuit device according to claim 1, wherein the laser driving circuit and the laser diode are connected to the second power supply line. 6. The first circuit includes a control circuit for optical reception,
The semiconductor integrated circuit device further includes an optical waveguide, a photodiode that receives an optical signal from the optical waveguide, and a signal processing circuit that processes an electrical signal from the photodiode,
The semiconductor integrated circuit device according to claim 1, wherein the photodiode and the signal processing circuit are connected to the second power supply line. In the initialization processing means, a first detection result as to whether or not the power supply of the second power supply line is established is stored in the storage means as a determination flag,
The value of the determination flag is transferred from the initialization processing unit to the main processing unit and held in the main processing unit when the process is transferred from the initialization processing unit to the main processing unit. The semiconductor integrated circuit device according to claim 6. In the main processing means, whether the power supply of the second power supply line is established based on the monitor signal from the AD converter when the value of the determination flag indicates that the power supply of the second power supply line is not established Detecting whether or not, and returning the processing from the main processing means to the initialization processing means regardless of the value of the determination flag when the detection indicates that the power supply of the second power supply line is established,
After accepting the processing from the main processing means, the initialization processing means detects whether or not the power supply of the second power supply line is established based on the monitor signal from the AD converter, and based on the detection The semiconductor integrated circuit device according to claim 7, wherein the value of the determination flag is changed and the first circuit is initialized.   When the value of the determination flag indicates that the power supply of the second power supply line is established, the main processing means performs the processing in the main processing means without monitoring the establishment of the power supply of the second power supply line. 9. The semiconductor integrated circuit device according to claim 7, wherein the semiconductor integrated circuit device is repeated. The microcontroller circuit has a port capable of executing either signal input or output;
The main processing means operates the port according to the value of the determination flag.
The semiconductor integrated circuit device according to claim 1.

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