JPS58137182A - Controlling system of memory access - Google Patents

Abstract

PURPOSE:To shorten the access time, by providing plural cascade receiving registers which can hold access request signals to optional storage banks. CONSTITUTION:Banks 201-204 can work in parallel to each other, and receiving registers 1-3 are connected in cascade so that they can hold access request signals to optional banks respectively. These access request signals are decoded by corresponding decoders 4-6, and a bank is selected out of those equal to a decided one by selecting circuits 7-10 on the basis of the prescribed priority. This selected bank undergoes an inspection through an inspecting circuit 11 for its propriety under operation. Then a bank is selected by a selecting circuit 12 among the banks which are not working on the basis of the prescribed priority, and a start command signal is applied to the selected bank. A strobe control circuit 13 produces setting signals which are applied to registers 1-3 on the basis of the start command signal and the access request signal.

Description

[Detailed description of the invention] The present invention relates to a memory access control method.

In particular, the present invention relates to a memory access control method in a storage device having a plurality of punctures that can operate in parallel with each other.

As is well known, a multi-bank configuration is one of the rounding measures to improve the operating speed and utilization rate of a storage device. This is because the storage device consists of multiple mosieres (called punctures) that can operate in parallel with each other, and a start command signal can be issued to different punctures at the same time. If the punctures operate simultaneously, the operating speed of the storage device can equivalently be improved. Also.

If a particular puncture fails, the storage space can be continued to be used by removing only that puncture and reconfiguring the storage device.

In the conventional memory access control method in this storage device, the reception that holds the puncture access request signal is a register, and the reception decodes the puncture request signal held by the register and reads the puncture requested for access. a decoder for determining whether or not the puncture determined by the decoder is in operation, and a test circuit for outputting a start command signal to the determined puncture; ] # includes a strobe control circuit that outputs a set signal to the register in response to the start command signal outputted by #.

In such a conventional configuration, the reception has only one register, and this reception can process access requests only in 9-order order. When an access request is waiting in the register, even if there is an access request to a link that is not in operation other than the request server, the request will not be accepted in the register, and the access time will be longer. There are drawbacks.

An object of the present invention is to provide a memory access method that shortens access time.

The method of the present invention is that in a storage device 1 having a plurality of punctures that can operate in parallel with each other, a plurality of cascade-connected reception registers, each of which can hold an access request signal to any of the punctures, is provided with registers; These receptions are held by registers and are determined by decoders corresponding to registers and by each of these decoders. selecting one puncture from among the same punctures based on a predetermined priority order (the same number of first selection circuits as the number of punctures); and whether or not the punctures selected by these first selection circuits are in operation. □A test circuit for inspecting whether the puncture is in operation or not, and selecting one puncture from among the nine punctures based on a predetermined priority order that is found not to be in operation according to the results of the inspection in the puncture inspection circuit, and issuing a start command for the puncture. a second selection circuit that outputs a signal; and in response to the start command signal outputted by the second selection circuit and the access request signal held in a register of each reception, the reception generates a set signal to the register. A strobe control circuit is provided.

Next, the present invention will be explained in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention.

In this embodiment, the three reception registers are registers 1 and 2.3, three decoders 4 and 5.6, and the first selection circuit 441f. , 8
, 9.10, a test circuit 11, a second selection circuit 12,
strobe control circuit 13, busy control circuit 14, tie-setting control circuit 15, - central processing unit 11
i100 and h111tv punk 201, 202゜203
．． 204.

For reception, the central processing unit 100 outputs an access request signal for operating one of the punctures 201 to 204 to the corresponding register, and attempts to operate the puncture specified by this access request signal. bank 201
Although the operations 204 to 204 each take a time of 4T (T is the basic time), the central processing value 11100 can output an access request signal at intervals of T. Therefore, it is possible to apply and operate the four bars 201 to 204 equally.

For each reception, registers 1 to 3 decide whether to accept the respective input signal in response to the presence or absence of set signals t31, 132, and 133 from the strobe control circuit 13. For each reception, the contents held in registers 1 to 3 are sent to the decoder 4.
Decoder output (actually an access request signal) to any one of JIEI selection circuits 7 to 1O according to the puncture number decoded in ~6 and determined as a result.
Output.

Il1 selection circuits 7 to 1O are punctures 201 to 2G, respectively.
4, and up to three decoder outputs can be input as described above.

These maximum three decoder outputs are selected on a first-in, first-out basis and output to the test circuit 11.

The inspection circuit 11 inspects each of the first selection circuit output cuffs' to 10' of maximum length of 41 m output from the first selection circuits 7 to 1O.
By comparing with up to four busy signals 141, 142, 143, and 144 from the corresponding busy control circuit 14, it is checked whether the puncture to which access is requested is in operation. Based on the result of the test, only the first selection circuit output for a puncture that is open and not in operation for which access has been requested is outputted to the second selection circuit 12 as a test circuit output.

The second selection circuit 12 receives up to four inputs from the inspection circuit 11.
No. 11 test circuit outputs 111-114 are selected according to the first-first-out method, and the starting command signal 1 for the puncture is selected.
Outputs 2'. This starting command signal 12' is sent to a strobe control circuit 13, a busy control circuit 14, and a tying control circuit 15.

The strobe control circuit 13 responds to a start command signal 12' and an access request signal held in registers 1 to 3 for each reception, and sends a set signal 13 to registers 1 to 3 for each reception.
1 to 133 are generated and output, and the generation logic is as follows.

The reception starts when register l is empty, or when the start command signal 12/ is output in response to a puncture specified by the access request signal held in register l. Alternatively, when the set signal 132 is output to the register 2, the reception unit outputs the set signal 131.

For register 2, reception is performed when start command signal 12' is not output for a puncture specified by the access request signal held in register l, or reception is held in register 2. When the start command signal 12' is output for the puncture specified by the current access request signal, the set signal 132 is output.

For register 3, reception is performed when registers 5 and 2 hold access request signals and no start command signal 12' corresponding to any of these access request signals is output. 11. The reception is performed when the register 3 holds the access request signal and the start command signal 12' corresponding to the access request signal is output. A set signal 133 is output.

The busy control circuit 14 outputs signals 141 to 144 to the test circuit 11 indicating that the 9th bank is in operation t (busy) for 3T after the start command signal 12' is outputted.

In response to the start command signal 12', the tie control circuit 15 generates and outputs various signals necessary for memory operation in response to a corresponding puncture.

FIG. 2 is a diagram showing the operation of this embodiment more specifically, in which the central processing unit 1100
01, 201, 201, 202, and 203, the access request signal IA is sent to each puncture request.

I B = lCt zA * 3 Showing important waveforms when A is output @ Between the timing t3 to t3 and the timing ξ t4 to t=, the flE1 selection circuit 7 and the second selection circuit respectively 12
are each two inputs, i.e. the decoder output 41.5
1 and test circuit outputs 111 and 113, but each receives a decoder output 51 and a test circuit output ill, respectively, using a first-in, first-out method.

Since the second and third access request signals 1a and IC specify the same puncture 201 as the first access request signal IA, during the operation of the puncture 201 based on the access request signals IA and IB, respectively, , is not output from the inspection circuit 11. With this result, the punctures were 202 and 20, respectively.
The memory operation based on the two 411th access request signals and the three fifth access request signals corresponding to No. 3 precedes the second access request signal IB and the third access request signal 1c, respectively. You can see that it is being executed.

In addition, in this embodiment, the first selection circuits 7 to 1O and the second selection circuits
The selection circuit 12 selects and outputs inputs using a first-in, first-out method; however, in the present invention, this is not determined, but by determining the priority order in advance,
The input may be rejected based on the ranking.

According to the present invention, instead of executing access requests in order of arrival, by employing the above configuration, while an access request to the same puncture as an active puncture is pending, access requests are executed in order of arrival. When an access request to a puncture occurs, the access request can be executed in advance of the pending access request, so that the equivalent access time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is a diagram for explaining the present embodiment. In the figure, 1, 2, 3...Reception is at the register,
4.5.6... Decoder, 7, 8, 9.10.
...First selection circuit, 11...Test circuit,
12... Second selection circuit, 13... Strobe control circuit, 14... Busy control circuit, 1
5...Tinging control circuit, 100...
・Central processing unit, 201, 202, 203° 204...
...Punk 1 /, 2 /, @ / ...
・Reception is register output s 41, 42, 43, 5t
, 53.6t...Decoder output, 7', 8',
9', IO'...First selection circuit output car 111
．． 112, 113, 114...Test circuit output,
12'...Start command signal, 131, 132°1
33...Set signal, 141, 142, 143
゜144...Busy signal, 201', 202
', 203'...Puncture operation waveform, T...
...Basic time. ,′−〜・

Claims (1)

[Scope of Claims] A storage device having a plurality of punctures that can operate in parallel with each other, each of which can hold an access request signal to the arbitrary puncture, and is connected in cascade, and the nine receptions are registers. , These receptions decode the access request signal for the puncture held by the register to determine the puncture for which access is requested. The number of first banks equal to the number of banks for selecting one puncture from among the punctures based on a predetermined priority order.
a selection circuit; and a test circuit for testing whether the punctures selected by these first selection circuits are in operation. a second selection circuit that selects one puncture based on priority and outputs a start command signal for the puncture; and the start command signal outputted by the second selection circuit and each reception are stored in the access register held by the register. The memory access control method is characterized in that each reception is provided with a strobe control circuit that generates a set signal to the register in response to a request signal.