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Data transmission device

A technology of data transmission and data, applied in the direction of electrical digital data processing, data processing input/output process, instruments, etc., can solve the problem of consuming chip area and so on

Inactive Publication Date: 2005-10-12
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] In the above-mentioned double-buffer method, compared with the single-buffer method, it is necessary to store twice as much information in advance, which consumes a lot of chip area.
In addition, in general, among the slave devices in the system, there are not many devices that need to use the double buffer method to achieve high transfer performance.

Method used

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Embodiment Construction

[0031] Hereinafter, embodiments of the present invention will be described in detail using the drawings.

[0032] FIG. 4 is a diagram illustrating a DMA controller (data transfer device) of the present invention.

[0033] The DMA controller (DMAC) 30 of the present invention, as shown in FIG. 4, is used in a dual bus system. The bus system of FIG. 4 includes DMAC 30 , bus 11 , bus 12 , RAM 13 , ROM 14 , video display 15 , and UART 16 . RAM 13 and ROM 14 are connected to DMAC 30 through bus 11 , and video display 15 and UART 16 are connected to DMAC 30 through bus 12 .

[0034] A plurality of channels (channel units) 31-1 to 31-N are mounted on the DMAC 30, and a buffer is provided for each channel. For example, a buffer 32-1 is provided on the channel 31-1, and a buffer 32-2 is provided on the channel 31-2. Each channel of the DMAC is provided with two registers S and D for setting addresses. Register S holds an address indicating a location in the slave device that is the...

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Abstract

A data transmitter is usually acted as a single or double cache to perform high-speed data transmission. It consists of two channels and two caches, which work in two modes. In the first mode, data is transmitted via the first channel with the first cache. In the second mode, data is transmitted via the second channel with the caches selected sequentially, including the first and second caches at least.

Description

technical field [0001] The present invention generally relates to a data transmission device, in particular to a data transmission device for performing DMA transmission on data in a dual-bus system. Background technique [0002] Patent Document 1 Japanese Unexamined Patent Publication Hei 1-229353 [0003] Patent Document 2 Japanese Unexamined Patent Publication No. 64-78351 [0004] In a computer system, in order to achieve high system performance, DMA (Direct Memory Access) transfer, which directly transfers data between two devices without going through the CPU, is an essential technology. [0005] In general, a computer system consists of multiple devices and a bus connecting them. Devices connected to the bus can be divided into devices called masters that output read and write requests, and slaves that receive requests output from the master. equipment. A DMAC (DMAController: DMAC controller) and a CPU that control DMA transfer are master devices that output reque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/00G06F13/28G06F13/38
CPCG06F13/28
Inventor 山崎恭启
Owner FUJITSU LTD