JPH01137646A - Integrated circuit - Google Patents

Abstract

PURPOSE:To immediately provide a special purpose LSI by adding a function programmable by an LSI user to satisfy the individual specification of the user to a function for a special utility. CONSTITUTION:In a digital, analog or digital/analog covalent LSI 1, digital and analog functional blocks 2, 3 having a special purpose for a special utility, such as a VTR servo function, a digital audio waveform equivalent function, etc., and a functional block 4 having a user programmable fuse type or ultraviolet ray erasable or electrically writable memory corresponding to the difference of the specifications of a function system, such as a motor, etc., are coexisted, a signal is exchanged between both or the former is controlled by the latter, and the whole LSI 1 is adapted for a user's specification. The block 2 is composed of a counter, a register, an arithmetic unit, etc., and the block 2 is composed of an amplifier, a differentiator/integrator, a filter, an A/D converter, a D/A converter, etc. After the LSI is manufactured, information is written by the user.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to integrated circuits, and in particular, for special applications that satisfy the individual specifications of integrated circuit users, dedicated LSIs can be immediately installed (Z
YAT).

[Prior Art] Conventionally, dedicated LSIs for special applications have been made individually to meet the specifications of their users. Therefore,
It took a long time to develop SLI. On the other hand, what is called a semi-gustam LSI allows a product that satisfies the user's specifications to be converted into an LSI in a relatively short period of time. For example, 198
The QuickChip 4, which was announced at the 6th Annual Proceedings of the IEE, Custom Inch Gray Tirado Circuit Conference, pages 244-248, coexists with an analog tile array and a digital gate array. This is an example of shortening the development time of SLI.

However, these methods require designing the entire LSI. ■Low degree of freedom in design; ■Dedicated LSI in terms of performance
inferior to ■After aluminum wiring! The I2 manufacturing process will be separate, and approximately two weeks of development time will be required. There were shortcomings in the following points.

[Problem to be solved by the invention]

The conventional technology does not take into consideration the possibility that an LSI user can immediately obtain a desired dedicated LSI.

Therefore, there has been a problem in that LSI users have no choice but to compromise in terms of functionality, performance, or development period.

An object of the present invention is to immediately provide a dedicated LSI for special purposes that satisfies the user's individual specifications regarding functionality and performance.

[Means for solving problems]

The above object is achieved by adding user programmable functions to special-purpose functions in order to meet the individual specifications of the LSI user or the user of the set on which the LSI is installed.

[Effect]

Functional blocks built into LSIs for special purposes have dedicated functions specific to the purpose, and user programmable functions have the function of setting user-specific functions and performance. Directions serve to control the functions of functional blocks.

User programmable functions are often achieved by incorporating a -degree writing fuse type ROM or fuse type PLA (programmable logic array), but at the development stage, ultraviolet erase type FRO is used.
It is also effective to incorporate M or PLA, electrically rewritable EEFROM, or PLA using it.

〔Example〕

A first embodiment of the present invention will be described below with reference to FIG.

Figure 1 (a) is a basic conceptual diagram of the present invention.

In digital LSI, analog LSI, or analog-digital coexistence LSII, analog and digital function blocks 2 and 3 have dedicated functions for special purposes such as VTR servo function and waveform equalization function for digital audio, and functions such as motor. A user-programmable functional block 4 is provided to accommodate differences in system specifications, and signals are exchanged between the two, or the latter controls the former, thereby adapting the entire LSII to the user's specifications. The dedicated digital functional block 3 is composed of a counter, a register, an arithmetic unit, etc., and the dedicated analog functional block 2 is composed of an amplifier, a differentiator, a filter, an AD converter, a DA converter, etc., or a part thereof.

The user programmable function block 4 is shown in FIG. 1(b)~
As shown in (e), it is constructed using a fuse type, ultraviolet erasable type, electrically rewritable memory, or the like.

That is, the figure (b) shows a user programmable logic array (hereinafter referred to as UPLA) consisting of an AND plane and an OR plane.
) 5 and a feedback register 6. In addition, the user programmable ROM (
Reference numeral 7 (hereinafter abbreviated as UPROM) is composed of a matrix ROM, to which a decoder 8 is coupled. (d) The figure shows a programmable resistor array, and the above UPLA or UPRO
It is composed of M5, a resistor array 9, and a switch 10.

(e) The figure shows a programmable capacitor array with the above UP[,
A or UPROM5 and capacity array 11. It is composed of a switch 10.

According to the embodiment described above, after the LSI shown in FIG. 1(a) is manufactured, information can be written by the user, and desired functions and performance can be obtained by ZTAT.

A second embodiment of the present invention will be described below with reference to FIG.

This embodiment is a specific example in which a dedicated analog functional block is controlled by the user programmable functional block described in the first embodiment. FIG. 2(a) shows an active filter using an amplifier and has second-order low-pass characteristics. In (a), the capacitance value is controlled by a user programmable function such as tLP LA 5, and the frequency characteristics of the filter can be adapted as desired by the user. The dashed arrows are control signals for the individual switches.

FIG. 2(b) shows a filter similar to that shown in FIG. 2(a), but the filter characteristics can be adapted to desired characteristics by controlling the resistance value. Although (a) and (b) are filters using a resistor, a filter using a switched capacitor can also achieve the same purpose.

FIG. 2(c) shows an amplifier. By controlling a plurality of load transistors with switches, the load can be made variable and the gain can be set to a desired value.

FIG. 2(d) shows an amplifier. By controlling the connections of the transistors that make up the bias circuit, the bias current value can be changed, and the speed and power can be determined as desired. This circuit will not work if all transistors are not connected. Power consumption can be reduced by turning off the bias of unnecessary circuit blocks in this way.

FIG. 2(e) shows an amplifier. A shunt capacitor is inserted into the second amplification stage to create a circuit with phase margin. When the transistor switch is turned on, the connected capacitor works as a shunt capacitor. By controlling the capacitance value, the frequency characteristics of the amplifier can be made variable. The transistor switch is connected in series with the capacitor and also serves to prevent low impedance between the gate and drain in the high frequency range.

FIG. 2(f) shows an amplifier. Peaking characteristics can be varied by controlling the capacitance value connected in parallel to the emitter resistor.

As described above with reference to FIG. 2, in this embodiment, desired analog characteristics can be obtained by ZTAT. Furthermore,
It is also very effective for correcting variations in elements inside the LSI, variations in external parts of the LSI, etc., and adjusting the performance at the level of the board or set on which this LSI is mounted.

A third embodiment of the present invention will be described below with reference to FIG.

This embodiment is an example in which a plurality of circuits as described in FIG. 2 are connected. 13.14 is an amplifier, and 15.16 is a filter. Although the performance of these devices themselves can be made variable by the user, this embodiment shows a case where these connections are made variable. That is, if the gain is insufficient in the amplifier 131 stage, the switch is controlled and the amplifier 14
are connected in cascade, and when the amplifier 13 can obtain a sufficient gain, the output of the amplifier 13 is directly connected to the filter 15. The filter is the same, 15°16 is 2
Design it as the following filter.

If a 4th order filter is required, connect 15 and 16 in cascade, and if a 2nd order filter is required, control the switch so that 15 is directly output. In this embodiment, since the method of connecting analog blocks can be made variable, it is possible to widen the variable range of analog characteristics and also to program the signal processing sequence.

Hereinafter, the embodiment of the present invention shown in FIG. 4 will be explained with reference to FIG. This embodiment relates to an LSI in which analog functions and digital functions coexist. FIG. 4(a) is a configuration diagram of this embodiment. A filter block 17 functions as a prefilter. 18 is a clamp circuit, and 19 is an AD converter. 20 is a digital controller/processor, the output of which is converted back to an analog signal by a DA converter 21 and outputted by a post-filter 22. In this embodiment, both analog and digital functions can be made user programmable. That is, the filter block 17
．． 22 has a configuration as shown in FIGS. 2(a), (b), or 3, and is programmed by the user to obtain desired characteristics based on the input signal band i. The digital controller/processor should also be programmable for speed, performance, etc. For example, in the case of a digital filter, specifications can be changed by reading coefficients from a user programmable memory or by making connections variable, as shown in FIG. Also, as shown in (e), the counter 26
By allowing the preset values and outputs to be freely set, it is possible to create an LSI that is compatible with the user's specifications.

〔Effect of the invention〕

According to the present invention, it is possible to immediately provide a dedicated LSI for a special purpose that satisfies the LSI user's individual specifications regarding functions and performance. This makes it possible to substantially eliminate the LSI development time, which conventionally required from two weeks to one year or more.

Another great advantage is that it is possible to correct variations in components used in the periphery and adjust performance at the board or set level.

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram and main circuit diagram of the embodiment of FIG. 1 showing the basic conceptual diagram of the present invention, and FIG. FIG. 3 is a configuration block diagram showing a third embodiment of the present invention, and FIG. 4 is a configuration block diagram and principal part circuit diagram showing a fourth embodiment of the invention. DESCRIPTION OF SYMBOLS 1... LSI dedicated to user program, 2... Analog function block dedicated to special purpose, 3... Digital function block dedicated to special purpose, 4... User programmable function block, 5... User programmable logic array , 6...Register, 7...User programmable ROM, 8...Deducer, 9...Resistance array, 10...Switch, 11...Capacitor array, 12
゜13.14...Amplifier, 15, 16, 17, 22.
...Filter, 18...Clamp circuit, 19...A
D converter, 20... digital controller/processor, 21
...DA converter, 23...Register, 24...Multiplication piece / concave 1'+ j-z Fig. 2 Fig. 2 (C) <d) M2 concave (child) cc Fig. 3

Claims (1)

[Scope of Claims] 1. An integrated circuit characterized by having a dedicated functional block and a functional block that can be externally programmed using a fuse type, ultraviolet erasable type, or electrically rewritable type element. 2. The integrated circuit according to claim 1, wherein an analog function block or a block including an analog function is used as the dedicated function block, and this is controlled by a programmable function block.