DE3034274A1 - Magnetic bubble memory control system - uses clock-controlled micro-processor to control operational cycle of bubble memory - Google Patents

Abstract

The system utilises a microcomputer controlled by a clock generator (CL). The output of the microcomputer is fed to a latch register (L) that provides the five inputs for control of the bubble memory (BM). A fine control stage (PC) determines the period of control of the bubble memory inputs and interlocks the operation of the microcomputer over a timer (TI) input stage.

Description

Use of a microcomputer to control a

Magnetic bubble memory.

The invention relates to a variant of what is known to be quite complicated Control of a magnetic bubble accumulator, which was previously usually done with a special microcomputer representing special control modules is controlled, but now according to the invention of one, in itself usable for a hardly manageable number of purposes, General purpose microcomputer intended to be controlled.

The invention is based on the use of a clock generator clocked microcomputer for rough control of the operating phases of a write path, many secondary loops and a magnetic bubble memory having a read path, whereby, while counting the number of rotating field cycles, the transport of the magnetic bubbles in the magnetic bubble memory during successive phases of operation, especially during the phase - of registration into the write path, - the transfer to the secondary loops, - the shift in the secondary loops, - the transfer to the read path and - the transfer from the read path, is controlled by a rotating field with a rotating field frequency that has a gan.zz # h1ige # 3ru - # chtei1 # d.er- Sequence frequency of the clock generator is.

Such an application is found in a large number of references, particularly the magnetic bubble memory manufacturer, described, see e.g.

- the compilation Rockwell Bubble Memories, RBM 256 et al., Rockwell Boarding school 1980, there in particular in the section "Data Sheets" --- Bubble Memory Devices and Modules (1978), --- D-RCM 650 (Aug. 1979), --- Document D-RBM REV. 3, Febr. 1980, and --- Document D-RLM 658 REV. 1 (Nov. 1979), as well as - 1979 Electro Conf. Record, New York 19./20. April 1977, Section 12/3, - Western Electric Engg., April 1979, pp. 13-18.

As can already be seen from the prior art mentioned, the Magnetic bubble accumulators controlled in this way are used for a wide variety of purposes, e.g. as a central announcement device, e.g. for announcements such as the connection is busy or call information from telephone switching systems.

The known applications already have those for the invention given advantages, - the number of rotating field cycles in each of the different phases to reliably monitor the control, - thus a loss of information and / or avoid unintended delays in writing and reading by all bits to be written into the memory locations provided for their position in the bit sequence inscribed and unnecessary when reading, neither skipped nor repeated, and - the timeliness of the respective initiation of the takeover from the write path into the secondary loops and the transfer from the secondary loops to the read path to ensure.

The invention also offers the advantages - regardless of the special control modules a common, often very inexpensive, multi-purpose microcomputer to use to control the magnetic bubble accumulator, - the microcomputer not only to control the magnetic bubble sp eichers, but at least in the breaks between the controls of the Magnetic bubble memory, additionally for arithmetic operations and / or to control others Units to apply; the microcomputer can then, for example, be used in a magnetic bubble memory announcement system additional traffic light controls and tramway point controls at tram stops carry out; the microcomputer used can also be used universally with little effort on microcomputers; and - the end of each operating phase, namely the last of the necessary rotating field cycles, especially easy with the multi-purpose microcomputer determine, as well as the initiation of the next operating phase, namely the Supply of the special, known control commands required for this in each case, such as TRANSFER-IN, TRANSFER-OUT, and the like, from the general-purpose microcomputer to the respective affected control inputs of the magnetic bubble accumulator, as well as the correct count of the rotating field cycles of the next operating phase, in good time to particularly simple Way to be able to achieve.

All of these additional benefits are simultaneously due to the well-known Special control modules are not offered.

Multipurpose microcomputers, including those with a timer - that is, with one Special counter that counts impulses that can be fed to the microcomputer from outside and the is first loaded with an adjustable output number and then up to Overflow counts, with an overflow signal being sent to a temporary during the overflow kipeende flip-flop, which is often formed by a so-called flag, is supplied, so this toggle switch a special group of signals or Can trigger commands is known for itself several times, see e.g.

the INTEL microcomputers 8048 and 8748, as well as z, B. the additional modules 8021, 8253 and 8253-5 in - INTEL, MCS 48th Family of single chip microcomputers, User's Manual, Apr. 1979, especially pp. 2-21, 2-22, 2-26, 4-3 and 8-9 to 8-13.

The use of microcomputers to control systems and devices is well known, e.g. for controlling subscriber stations of telecommunication switching systems, in particular by - 4th Europ. Conf. on Electrotechnics EUROCOM 180, Stuttgart 24. until March 28, 1980, Preprints, pp. 199 to 201.

The additional advantages of the invention are mentioned in the introduction known application achieved in that - the microcomputer is a general purpose computer is, which contains a timer in a manner known per se, which with each rotating field cycle receives a counting pulse and temporarily a toggle switch when it overflows switches, and - the microcomputer when switching the toggle switch One each time The timer is loaded with an output number, whereby the respective differences, on the one hand the final number reached when the timer overflows and on the other hand the Output numbers, in each case the number of rotating field cycles during the individual phases, or during the individual sections of these phases, the writing or reading process correspond.

The additional advantages of the invention are so by means of a A general purpose microcomputer that specifically has a timer and one of the Contains a timer controlled toggle switch or a FLAG and its operation at adapted to the requirements of the magnetic bubble memory in a clear manner will.

The additional measures specified in the subclaims allow to achieve additional benefits.

Namely, it allows the measure according to claim 2 for fine control of the magnetic bubble accumulator the time for the delivery of the .special control command from general purpose microcomputer to magnetic bubble memory, 3 which control signals emitting, e.g. those controlling these rotating field coils, outputs of the general-purpose microcomputer To relieve time, especially with it the multi-purpose microcomputer when necessary can carry out further controls via this otherwise occupied output, and 4, the same multi-purpose micro-computer not only to control the magnetic bubble accumulator, so not only e.g.

for controlling an answering machine, but also for controlling other facilities, e.g.

for the control of facilities of exchanges by mounting in a subscriber station of a telephone switching system.

The invention and its developments are illustrated using the figures further explained, with Figures 1 and 2 to explain addressing options with reference to the auxiliary loop storage locations known per se, 3 shows an exemplary embodiment 4 shows an embodiment of the fine control of the invention Application shows, and 5 to 8 examples of timing diagrams for the coarse control of the operating phases show the application according to the invention.

First of all, let us look at the general properties of the magnetic bubble accumulator, preferably based on the Rockwell memory available under the designation RBM 256 with a maximum storage capacity of 289 050 bits, received before the Use of the general-purpose microcomputer according to the invention for controlling such Memory is received.

The magnetic bubble memory module, also the module RBM 256, can can be divided into three areas: 1. write path, 2. memory area or secondary loops and 3rd reading path.

The magnetic bubbles in the write path correspond to the ones to be written Information generated serially. Is the write path consisting of a data block e.g. from 282 bits, filled, so this whole data block can be sent to the takeover organs, at the so-called ~ TRANSFER-IN positions11, in the e.g. 282 different secondary loops, often also called minor loops, are taken over in one cycle, a single bit per secondary loop.

The memory area consists e.g. of 282 secondary loops, from However, up to 22 loops can often be defective. These 22 broken loops usually have to insert zeros in the data block to be written correspond.

The length of each secondary loop, e.g. 1 025 positions per Secondary loop, corresponds to the total number of data blocks to be saved. at 1,025 positions of each secondary loop are a total of 260 bits in data block lengths 266 500 bits can be stored if there are 22 defective loops.

When reading, those in the grapevine loops are given to special takeover organs, the TRANSFER-OUT positions, the standing 282 bits are simultaneously transferred to the read path and can from there serially via detectors from the magnetic bubble memory module can be read out.

The magnetic bubbles are transported with the help of a magnetic one Rotating field, which is normally generated by two coils perpendicular to each other will.

The creation and takeover of the magnetic bubbles between the secondary loops and the write or read path are caused by strong local magnetic fields, which are normally generated by special current loops, namely by means of externally supplied control signals, which are generally carried out by a specialist e.g. GENERATE, TRANSFER-IN, TRANSFER OUT, REPLICATE.

When writing or reading the magnetic bubble memory, these control signals must normally in the context of the so-called coarse control, also called coarse timing, while very specific turning cycles, and within these turning cycles normally during certain angular degrees of this cycle in the context of the so-called fine control, also fine Called timing.

When using the magnetic bubble memory as the voice memory of a telephone answering machine e.g. a rotating field frequency of 16.7 KHz or 22.2 KHz is used, cf. E.g. the older registration P 30 24 688.9 = 80 P 6087 DE.

The magnetic bubble accumulator can be operated in the so-called multipage mode, for example that means that the data blocks a e.g. 282 bits, with no gap between the Data blocks, be written and read one after the other. It is favorable, in addition between the physical and the logical addressing of a Differentiate between data blocks.

With physical addressing, the storage locations are in the Secondary loops simply counted according to their spatial position, see Fig. 1. This Figure 1 shows a section of the write path WL with the symbolically indicated Takeover process via which the bit to be written is transmitted by a TRANSFER-IN control signal. aside from that FIG. 1 shows a section of the reading path RL with its symbolically indicated Takeover organ, through which a bit saved from the Xeboisch loop shown a TRANSFER-OUT is transferred to the RL read path. The through the applied rotating field The direction of rotation of the bits stored in the Gebiblschleife is caused by a Symbolizes arrow. The physical addresses of the storage locations are accordingly their chain-like sequence entered in FIG.

FIG. 2 essentially corresponds to FIG. 1.

In Figure 2, however, in addition to the physical addresses the associated logical addresses are shown in brackets, i.e. the physical Address zero is the logical address zero, and physical address 282 is the logical one Address one, etc. corresponds to. The logical address corresponds to the number the bits per data block - where in .Figur 1 and 2 it was assumed again, the data block As with the RBM 256 block mentioned, each has a total length of 282 bits. at In logical addressing, the memory locations are addressed in the order how the data blocks are processed, that means how many enrolled Data block belongs to the bit stored there before the start of the TRANSFER-OUT transfer.

If the secondary loop contains 1,025 storage locations, the following relationship applies to converting the two types of addressing: 282 ~ logical address = 1 025 ~ x + physical address, where x represents an integer. This gives the following conversion table for this example, see Figure 2: logical address h sical address 1 282 2 564 3,846 4th 5 385 6 667 7 949 8 2 # 6 9 488 1 # 77 # 1 # 23 461 1824-743 Examples of the coarse control for reading with multipage mode are shown in particular in FIGS.

In the example of reading shown in FIG. 7, during a ~ Pre-run ", which here lasts 85 rotating field cycles, in rotating field cycle 2 by means of a so-called.

REPLICATE control signal non-destructive 1 bit from each of the 282 secondary loops, each from the logical memory locations shown in FIG Zero, copied to the RL read path at the same time. There are then in series in the reading path accordingly the 282 bit resp.

Magnetic bubbles ready for reading, but only after the rotating field cycle 85, by wandering this serial data block on the read path via buffer locations to the detector, the first bit of this cached first data block from Block output is output to the outside as the first electrical binary character. The delivery of this first data block is ended after 282 rotating field cycles, whereby but already at rotating field cycle 199, by means of a next REP # ICATE control signal, the bits originally stored in logical address 1, see FIG. 2, now with the takeover body in the reading path RL, Corresponding processes control the reading of the second data block, see Fig. 7, and finally the penultimate Data blocks, see FIG. 8 - FIG. 8 thus represents, so to speak, a continuation of the Fig. 7 shows. With rotating field cycle 199 during the delivery of the penultimate data block the last data block is transferred to the read path RL, which in turn starts with the The next rotating field cycle 1 is output at the block output. During the delivery this last data block does not provide the takeover organs with a REPLICATE control signal more forwarded. After the last rotating field cycle 282, further rotating field cycles can E.g. up to cycle 479, the block can be fed to the in the secondary loops to bring further stored data blocks into good starting positions, i.e. 1 without To be able to read delay again from the beginning by the lead shown in FIG. 7 - but this lag from the rotating field cycle 283 on will not be a corresponding one electrical binary character is more delivered at the block output. Incidentally, also finds When writing, there is often a corresponding advance notice before the takeover, because too the write path WL between its input, that is to say the magnetic bubble generating element, and Buffer locations that are often similar to its takeover organs and correspond to a shift register contains.

In addition, it is often beneficial to add a trailer when writing, although the last data block has already been taken over into the quake loops because you often get good starting positions for the stored data blocks in the secondary loops reached, so that during the subsequent reading, see Fig. 7, the advance more or less immediately, i.e. without unnecessary delay, with the supply of the REPLICATE control signal in particular can begin.

FIG. 3 shows schematically an example of the application according to the invention a microcomputer clocked by the clock generator CL, e.g. from the above Type 8048, for rough control of the operating phases of the write path, the many Secondary loops and the reading path having magnetic bubble memory BM, over whose, here 5 different control inputs CI, whereby the transport of the magnetic bubbles in the Magnetic bubble accumulator BM during its successive operating phases (especially during the phase of writing the data bits DI in the write path, the takeover from the write path to the secondary loops, from shifting the transferred data bits DI in the secondary loops, the transfer from the # secondary loops Xn the read path and the transfer of the accepted data bits from the read path as data bits DO) from a Rotating field with a rotating field frequency, e.g.

16 kHz, which is an integer fraction, e.g. a Seventy-fourth, the repetition frequency of the clock generator CL is.

The microcomputer, here 8048, is a general-purpose computer that is used for known way (at least on a separate, additional Module or together, for example, with the processor of the multi-purpose micronomputer) Tler r TI contains a counting pulse TC, e.g.

directly from the magnetic bubble memory BM, or e.g. from one of the modules Multipurpose Microcomputer 8048 / PC PC, receives and temporarily overflows a flip-flop switch FL, e.g. a * flag FL.

switches.

The microcomputer 8048 conducts when the flip-flop FL is switched each one charge of the timer TI with a certain output number, where namely the respective differences, on the one hand that reached when the timer TI overflowed The final number and, on the other hand, the initial numbers, in each case the number of rotating field cycles TC during the individual phases, or sections of these phases, the writing = or Correspond to the reading process. The final number is, depending on the type of the used Block, e.g. 1 (binary 00000001 or e.g. 256 (binary 1 0000 0000), if the timer TI 8 bits wide (1111 1111), the effective width of the timer TI being through suitable additional self-counting structure of the flag FL, often still considerably wider, e.g. 13 instead of 8 bits - in this case the final number would be the Timers TI no longer e.g. 256, but just e.g. 8 192, corresponding to the 14-digit Binary number 10 0000'0000 0000.

So if you want to set the timer TI so that it starts at the 282nd rotating field cycle overflows (e.g. advance to 0 0000 0000 0000), then you have to start the first rotating field cycle the final number (binary 10 0000 0000 0000), reduced by (decimal) 282, in the timer TI so that the timer TI at the 282nd rotating field cycle, i.e. at the end i ser it. Operating phase or this operating phase section, the flip-flop switch FL switches. This changeover triggers again, for example, as required the supply of a (REPLICATE) control signal CI, in Fig-. 3 via an intermediary Latch register L, to the magnetic bubble memory BM off, and / or (only) the reloading of the timer TI with a (same or different) starting number, in particular due to the switching of the toggle switch, which is several rotating field cycles later FL feed another control signal pattern CI to the magnetic bubble memory BM. the Flip-flop FL can therefore, at the end of the operating phase or at the end of the operating phase section, e.g. query the next command stored in a memory, which, possibly after decoding, the new control signal pattern, or possibly just a new charge of the timer TI, and / or e.g. a separation of the general purpose microcomputer 8048 from the relevant magnetic bubble memory BM and at the same time a connection of this general-purpose microcomputer 8048 with another building block, e.g. with another one not shown in FIG Magnetic bubble memory 1 initiates.

The latch register L represents a collection of between the Building block 8048 and the magnetic bubble memory inserted flip-flops, wherein z.3. in each wire of the 5 control signal wires, see CI in Fig. 3, one in each case Toggle circuit can be inserted.

These flip-flops L relieve port 2 of the module 8048 by the flip-flops L also consist of extremely short control pulses that control the port Leave 2, if necessary make long-lasting control signals CI, e.g. in correct Time spans the long-lasting current pulses CI for the usual generation of the rotating field make in the block BM by means of a pair of crossed coils.

In the example shown in FIG. 3, the 1 full rotating field cycle lasting 5 bits of the output signals of the latch register L with corresponding, respectively only a comparatively very short period of time lasting 5 bits of output signals the fine control PC getNDet, whereby the control signals CI of the magnetic bubble accumulator BM arise. The latch register L activates, depending on the bit pattern of its output signal, individual output signal wires of the fine control PC during a full rotating field cycle, so that each of the wires of the fine control PC activated in this way is serialized of bit information as control signals CI certain of the control inputs CI des Magnetic bubble memory BM can be supplied. As will be explained later, are consecutively at regular time intervals during a full rotating field cycle always the same sequence of, here for example 5-bit wide, bit patterns on these, here 5, outputs of the fine control output. Using the latch register L will be but only certain wires of these, here 5, outputs of the fine control FC, depending on Operating phase or depending on the operating phase section, activated. This will make individual Set the bit pattern sequences output at the output of the fine control PC, screened out and fed to the respective associated control inputs CI of the magnetic bubble memory BM.

The control of the module BM can also be done by means of a multi-purpose microcomputer 8048 belonging microprogram, e.g. by means of the stored in a ROM Firmware, can be monitored and / or initiated by itself, e.g. not during of a whole rotating field cycle, but, in and of itself, with magnetic bubble storage controls As is known, only (comparatively briefly and in good time due to fine control) in a certain period of time within of the relevant rotating field cycle, the new process initiated by the flip-flop FL begins. An example for is shown in FIG. The ROM in question is here in the fine control unit PC contain. The control of the magnetic bubble accumulator is here on two levels subdivided, a higher-level and slower coarse control, implemented with the mentioned 8048, or e.g. with the type 8748, and a fast fine control PC as Function generator, i.e. for timely generation in the respective time periods of control signals, in particular of CI, and in this example even of counting pulses TC.

In this example, the coarse control specifies in particular, during which rotating field cycles of the magnetic bubble memory BM which of the signals GENERATB, TRANSFER IN, TRANSFER OUT, REPLICATE etc. are active. i.e. the magnetic bubble accumulator EM should be fed via its control inputs CI by, depending on the rotating field cycle, or, depending on the operating phase section, during a full rotating field cycle E.g. from the program of module 8048, only certain wires of the output wires the fine control PC can be activated.

Should a read or write process be initiated with the BM block. all enables for the first rotating field cycle are in port 2 of the 8048 necessary control signals Ct, and the release for the start of the fine control PC with a start signal ST, by activating the output wires accordingly Port-2 du # hg # leads.

In a further signal, namely with bit 27 of port 2, the State of port 2 is transferred to the latch register, for example, 8 bits wide. The fine control PC, the time and duration of the control signals CI within of a rotating field cycle is started by the start signal ST.

The first rotating field cycle of this operating phase is running in the block BM. At the end of each rotating field cycle, the fine control delivers a special one Output wire the counting pulse TC, which advances the timer TI by one counting unit.

With the count pulse TC, the state is also entered in the latch register L. of the signals emitted by port 2 are accepted for the next rotating field cycle.

To prepare port 2 for the following rotating field cycle, stands so at least the time of a rotating field cycle is available. At a rotating field frequency of e.g. 22 KHz that is approx. 45 / u sec, i.e. a lot of time for the clock generator CL e.g. with 5 MHz clockable module 8048. During this time of 45 / u sec So the processor in block 8048 can execute at least seven commands.

The timer TI is adjusted with the counting pulse TC from the fine control and counted up. It must be carried out before the beginning of the next phase of operation E.g. with the value 256 - x supplied by the program, whereby here 256 the the construction of the timer TI specified final number assumed here as an example and x represents the number of counting pulses TC = number of rotating field cycles that are running, until a new pattern of release signals has to appear at port 2.

After these x counting pulses TC, the flag FL is set, its switchover , e.g. in the program stored in the software in module 8048, e.g. requirements The selected jump address is used in the software memory of block 8048 a bit pattern read that on port 2 next Bit pattern is output and that with the next count pulse TC in the latch register L is adopted. In addition, the timer TI is loaded with a new value 256 - x. This whole procedure between two successive counting pulses TC is allowed with in this example do not include more than seven commands, which is feasible.

Should the writing or reading of the magnetic bubble memory BM be final are terminated, port 2 is deleted (binary zeros only). The next count TC also deletes the latch register L and thus all enable signals stored there, as a result, no more control signals CI are fed to the magnetic bubble memory BM so that it is shut down.

For the operation of the magnetic bubble accumulator, there are e.g. five, depending on the design or nine control signals CI required. These control signals CI are through the Fine control PC generated at the correct time within the rotating field cycle. The correct one Release of the control signals CI for an entire rotating field cycle is therefore in particular Delivered by the fine control PC in cooperation with the coarse control component 8048.

The fine control PC exists e.g., cf. Fig. 4, from a modulo 74 counter CT, a 256 x 8 bit PROM and two 6 bit D registers D. The counter CT and the clock CL of the clock generator CL address the PROM. Six PROM outputs are on here the data inputs of the two D-registers D are switched. If only 5 control inputs CI are attached to the magnetic bubble memory BM, see. Fig. 3, then suffice per se, with regard to the additional wire for the counting pulses TC, if the in the PROM stored information bit patterns only have six digits each. Are but There are many more control inputs CI on the magnetic bubble accumulator BM, for example the following measures cheap;: A D register D takes over the information read from the PROM with the clock CL, the other D register D with the inverted clock CL. Through this measure will be the information from the even PROM addresses to the left, the information from the odd PROM addresses transferred to the right D register D. In this way, the PROM with a word length of only 8 bits, a 16-bit word width on the output lines the fine control PC can be achieved, doubling the word length a Doubling the number of lines in the memory, i.e. doubling the memory depth of the PROM required. A fine grid of a full rotating field cycle into a gapless one A series of 37 time periods means a PROM memory depth of 37 x 2 that is then required = 74 words resp.

Lines. Then the control signals CI with time periods of 4.80, i.e. with an accuracy of 4.80, based on a single full rotating field cycle of 3600, not only with e.g. 8-bit width, but even with 16-bit width if required be generated. The control signals can, as required, e.g. by using operated output amplifiers at the output of the D-register, which are necessary for the operation of the Magnetic bubble memory BM each have optimal strength or curve shape, wherein also some of the outputs of the PROM, e.g. two of its eight outputs, used to control the transmission properties of these output amplifiers can be.

If, for example, the magnetic bubble storage device is used as a telephone answering machine in the subscriber station of a telephone switching system is used to in particular to save speech signals modulated by delta modulation and to use as Sending out responses can even be done as a (delta modulated) pulse repetition rate choose a very low frequency, e.g. 16 KHz or 22 KHz.

The magnetic bubble storage rotating field then has the same frequency. the The frequency of the rotating field is determined by the fine control if this is via the Counting pulses TC and, via the timer TI, the rotating field cycle duration of the coarse control of the Block 8048. A rotating field cycle is used in this example, see Above, 37-fold raster. The frequency of the clock signal controlling the fine control must therefore be 16 kHz x 37 = 592 Hz at 16- »HzDghfeNdfrequenz, and at a rotating field frequency of 22 kHz be 22 kHz x 37 = 814 kHz. To generate this Clock signal frequencies will be the frequency, e.g. 4.92 MHz, of the clock generator CL accordingly, e.g.

divided by eight or six, e.g. by means of one at the entrance of the counter CT attached frequency divider.

The example of the invention shown in Figures 3 and 4 thus has a general-purpose microcomputer 8048 which has a clock CL counting function generator PC for fine control of the BM magnetic bubble accumulator during a contains individual rotating field cycle. This function generator PC is used here in the example also clocked by the clock generator CL. The function generator PC resp. Fine control PC counts the number of cycles, its counter CT is how a ring counter, after reaching its final number, always back to the same starting number reset, this counter here successively the addresses of each other the following RROM lines are generated so that -am. Output during a full rotating field cycle, each cyclically one after the other all stored in the PROM as (firmware) information Control signals CI are emitted, of which only individual positions as required by the processor of the general purpose 8048 microcomputer. Respectively at a certain number of cycles counted by the fine control PC, it delivers this Fine control the counting pulse TC for the timer TI as well the others Control signals CI, such as the special signals required for takeover, respectively in the time spans shifted as required to the rotating field phase according to the respective corresponding number of cycles paid.

In order to perform the reading operations shown in FIGS. 7 and 8, So when using the invention, the general-purpose microcomputer, if he has one Has a timer whose final number is 256 (more precisely: binary 0000 0000), e.g. operate as follows: At the beginning of reading, a rotating field cycle 1 must first run in advance, without that other control signals CI are active. The timer TI, which only counts to 255, is e.g. by means of firmware, from the general-purpose microcomputer 8048 itself with the value (256 - 1) (binary: 1111 1111) loaded. The release signal for the Fine control activated, see Fig. 3, i.e. only those for rotating field generation are activated via port 2 required places of the D-register outputs activated and with a one at the bit position 27 of port 2, the current state of port 2 is transferred to latch register L. So that the rotation of the rotating field in the magnetic bubble memory BM by exciting the corresponding coil started.

While the first rotating field cycle 1 is running, this is also the case in port 2 the REPLICATE control signal is activated for the next rotating field cycle 2. The firmware program of the general purpose microcomputer 8048 is now 2 * B-in-wait state until through the counting pulse TC that the fine control PC sends at the end of each rotating field cycle sends out, the timer TI is counted up by one and thus because of the overflow the Toggle switch / the flag FL is toggled. Through the of the Fine control PC via the OR gate to the latch register L counting pulse TC, the state prepared in port 2 or activated control signals is still in the latch register L is taken over and the next rotating field cycle 2 is initiated and the REPLICATE control signal CI is supplied.

The timer TI overflowed with the same count pulse TC, so that now at port 2 the release for the REPLICATE control signal CI as well as the rotary field controls # pa, le CI disappear. The timer TI is now (e.g. using the firmware in the general-purpose microcomputer 8048, also triggered by the overflow of the timer TI or the flag FL) with the Value (256 - 83) loaded. The current status at port 2 (only Drehfeld-Steiier # i-LeCI) is entered into the latch register with the next count pulse TC at the end of rotating field cycle 2 L and is retained during the next 82 rotating field cycles.

The general purpose 8048 microcomputer or its processor can now until the next rotating field cycle 1, see Fig. 7, about 3.4 m sec (82 x 42 / u sec) long deal with other controls than the control of the BM magnetic bubble accumulator, e.g. with the aforementioned control of traffic lights and points. Only through the renewed Switching the toggle switch / flag FL when the timer TI overflows becomes the general-purpose microcomputer 8048 prompted the continuation of the control of the magnetic bubble accumulator BM. If the general purpose microcomputer 8048 (currently) no other controls or Has to carry out activities, one can e.g. using: #a firmware, too wait in a waiting loop for the flag FL to be switched over.

This ends the pre-run and the main process begins with the Delivery of the first data block of 282 bits. This is because the timer has TI or the flag FL reports the overflow, if necessary the STROBE release is also given in port 2 which is transferred to the latch register L with the next count pulse TC.

The timer TI is loaded with the value (256-198). The wait on the switching of the flag FL is now approx. 8.3 m sec, which again is different, e.g. again to control traffic lights and points, from the multipurpose microcomputer 8048 can be used.

If a second data block is to be read, then in particular triggered by the same firmware, after the 198 three-field cycles # # n ~ Po # t 2 iirätzllc # iai; e RZ # PLICATE enable active, which in turn with the counting pulse TC for the duration of a single rotating field cycle is transferred to the latch register L. Follow it, again controlled in a corresponding manner by the timer TI, 84 further rotating field cycles without REPLICATE release until all 282 data bits of the first data block have been read.

This completes the delivery of the first data block with a length of 282 bits. There are now so many more releases of data blocks in a corresponding manner by means of of the timer TI, how many data blocks are to be read this time.

As already indicated, the trail, see FIG. 8, does not contain any REPLICATE control signal more, but only sequences of rotating field cycles that alone can be controlled by rotating field control signalsEd £ n CI, with the exception that with some Magnetic bubble memory module type BM, for transferring the bits from the read path into the electrical data output, also in a corresponding manner from the latch register L the STROBE control signal CI is sent out; see also the den 7 and 8 correspond to FIGS. 5 and 6, in which the transmission of the (permanent) STROBE control signals is indicated during the data block deliveries. Because here the Timer TI only has 8 steps, so because it has the number 256 as the final number, it is for one Overrun that contains more than 256 rotating field cycles, even if there is no STROBE control signal is to be given, the timer TI has to be loaded several times, e.g. first with (256 - 250), then with (256 - 229) to carry out all rotating field cycles, although in this case in each rotating field cycle only ever one and the same rotating field control # i # CI as control signals CI are to be submitted.

In FIG. 5 it was also indicated that the number of the rotating field cycles during the delivery of later data blocks also e.g. by the number of the physical Address of the Kebenschleife can be defined, its information in the relevant Rotary field cycle have just arrived at the read takeover organs of the read path and their information therefore, when a REPLICATE control signal is fed in, all at the same time be transferred to the reading path.

One advantage of the latch register L is that it enables the To relieve port 2, or the ports, of the general-purpose microcomputer 8048 so that the Multipurpose microcomputer 8048 especially often over and over again for long periods of time Controlling other devices instead of controlling the magnetic bubble accumulator BM, can deal. But even if no such latch register L is inserted would, the general-purpose microcomputer could at least in those times that after the after-run N shown in FIGS. 6 and 8 and before the later next lead V lie, or if such forerunners V and / or tailings N - which are in the often long pauses between the sequence of the first fall of a second, Much later main process, with a control of other facilities deal with, for example, the control of the aforementioned traffic lights and / or points.

The devices can also, for example, be components of a telephone switching system so that the multi-purpose microcomputer 8048 is not just the magnetic bubble memory BM, but e.g. additionally the control of a switching matrix of the system and / or e.g. can control connection sets of this system.

Especially if the magnetic bubble memory BM together with the general-purpose microcomputer 8048 is attached in each case in the subscriber station of this system, can the magnetic bubble memory BM is also used as a telephone answering machine will.

In summary, the following can be stated for the application described: A timer TI is used to count depending on the number of each expired Rotary field cycles determined further controls of the magnetic bubble memory BM, e.g. the delivery of further data blocks, run by means of the general purpose microcomputer 8048 to let by corresponding sequences of control signals CI at the port (s) be generated. For this purpose, the timer TI, e.g. by means of a firmware command, is linked to the Number of rotating field cycles / Zäh1 # pulses TC, which are up to a change in the Port to be output control signals CI should take place, loaded. Until this change If necessary, the general-purpose 8048 microcomputer can handle other Programs or with the controller deal with other institutions. After the set number of rotating field cycles, the Timer TI or the flip-flop circuit FL the sequence of the control of the other facilities and the control of the magnetic bubble memory BM is continued by the corresponding Control signals are activated or generated at the port. To do this, the timer TI is like this ~ loaded so that it triggers the next overflow when the control signals of the general purpose microcomputer 8048 should change again. The one from the general purpose microcomputer 8048 output control signals CI are the releases of the corresponding control signals of the magnetic bubble memory module BM, e.g. REPLICATE, TRANSFER IN, TRANSFER OTIT, REPLICATE, STROBE, SWAP, GENERATE.

Using the example of a read process control, it was shown how the timer TI accordingly with the number (1) of the necessary rotating field cycles for dns first REPLICATE control signal is loaded. The release signal for the rotating field is sent by the Port 2 output. The timer TI receives a counting pulse TC per rotating field cycle. )he Timer TI utri o? 4o loaded with 256 - 1 and also the REPLICATE control signal on the port 2, to transfer the information from the secondary loops into the read path, activated.

If the timer TI has overflowed, the REPLICATE control signal on Port 2 deactivated, the # Timer TI with the next number (83) of rotating field cycles loaded, which are necessary to the transferred in the magnetic bubble memory BM in the read path first data block, more precisely the first 198 bits of the same, at the read output of the magnetic bubble memory module BM to be able to submit. As soon as the timer TI overflows again, it is started with (256 - 1) according to the number (1) of rotating field cycles required for the delivery of the next -REPLICATE- Control signal loaded. This w rd besides the delivery of the next bit at the output of the block BM also sends the REPLICATE control signal CI handed over to the block BM.

If the timer TI has overflowed again, it is loaded with (256 - 83), whereby the rest of the data block is output, but the timer TI has a sufficient one high final number, e.g. 3. 1024 instead of 256, then it can immediately according to the number of rotating field cycles (here 281) are loaded until the next REPLICATE control signal. Finally runs the timer TI, if it can only count up to 256, more precisely blow binary 1111 1111, over, is loaded-er ~ according to the number of turning cycles (198) to go to the next REPLICATE control signal to read out the first 198 bits of the next data block again.

However, if no further data block is to be read, the Timer TI must be loaded according to the number (479) of rotating field cycles that are required are to get the information stored in the Hebinschleizen back into their for to bring a reading process start favorable starting position. If the timer is TI then overflowed, the release, in particular on the wire of port 2, for the rotating field removed. The reading process is finished and the next reading process begins prepared. In. in the meantime, the general-purpose 8048 microcomputer cannot do any more interrupted by the magnetic bubble memory control, deal with the control of others Units and / or deal with the processing of any programs.

Arrows in FIGS. 5 and 6 show by way of example at which time points accordingly a dbernsuf of the timer TI can be set to by means of the toggle switch FL to be able to resolve the change in the control signals CI right @ eit @ g.

In itself, the magnetic bubble memory BM is also made by a general-purpose microcomputer 8048 / PC controllable, which, instead of the timer TI and the toggle switch / flag FL, has a contains a normal counter and a comparator, where - the counter, (e.g. by means of of the accumulator) starting from #, the number of rotating field cycles TC counts, - the comparator consists e.g. of a register in which the number is initially entered of the rotating field cycles until the next necessary change of the respectively necessary control command combination CI is written in and - by means of comparison commands in each case with each rotating field cycle (TC) it is determined on the basis of the counter reading and the comparator content whether now the combination CI is to be changed; with regard to comparator commands, see e.g.

--- Löbel, Müller, Schmidt, Lexikon der Datenverarbeitung, Verl. Modern ind, 1969, p. 539.

However, such a control of the magnetic bubble memory BM consumes Much more time for the General Purpose Microcomputer 8048 than if it were a TI and contains a KiDpschalt / flag FL, because with a timer TI no comparison command and no more relatively complex arithmetic operations performing the comparison are necessary.

4 claims O figures Blank page

Claims (4)

Claims. Use of a microcomputer clocked by a clock generator for rough control of the operating phases of a one write path, many secondary loops and a magnetic bubble memory having a read path, wherein, while counting the Numbers of rotating field cycles, the transport of the magnetic bubbles in the magnetic bubble accumulator during successive phases of operation, especially during the phase - of enrollment in the write path, - the takeover in the level loops, - the shift in the secondary loops, - the transfer to the read path and - the transfer from the read path, is controlled by a rotating field with a rotating field frequency that is a complete @ ahligen BruehteLl the repetition frequency of the clock generator is, d u r c h e k e n It should be noted that - the microcomputer (8048) is a general purpose computer, the in a manner known per se contains a timer (TI) which is activated with each rotating field cycle receives a counting pulse (TC) and temporarily a toggle switch when it overflows (FL) switches, and - the microcomputer (8048) when switching the toggle switch (FL) each initiates a charge of the timer (TI) with an output number, where The respective differences, on the one hand the one reached when the timer overflowed (.TI) The final number and, on the other hand, the initial numbers, each the number of rotating field cycles (TC) during the individual phases, or during the individual phase, this failed Phases correspond to the write or read process. 2. Application according to claim 1, d a d u r c h g e k e n n z e i c h n e t that - the microcomputer has a clock counting function generator (PC), for phase-appropriate fine control of the magnetic bubble accumulator (BM) during an individual Rotating field cycle, this function generator (PC) also from the clock generator (CL) is clocked and the number of clocks counts, like a ring counter, after reaching its final number is always reset to the same initial number, --- The counting pulse (TC) for the timer (T #) and the other control signals, such as those for takeover necessary special signals, in the phase shifted as required to the rotating field phase according to the respective counted number of cycles (via CI) to the magnetic bubble accumulator (BM) returns. 3. Application according to claim 1 or 2, d a d u r c h g e k e n n e i n e t that - between the microcomputer (8048) and the control rhyme # (ci) -aB a bistable trigger circuit (L) is inserted. 4. Application according to one of the preceding claims, d a d u r c h e k e n n nn n n e i n e t that - the microcomputer (8048), at least in times when he is not controlling the magnetic bubble memory, facilities one Telecommunications switching system, e.g. when the microcomputer is installed in a subscriber station, controls.