Apparatus and method for supporting external storage device interface mode switching
A technology of external memory and interface mode, applied in the direction of input/output to record carrier, etc., can solve problems such as difficult control, inability to use chips, and complicated operation, so as to reduce the workload of development, improve scalability, and reduce implementation costs Effect
Active Publication Date: 2007-12-26
HUAWEI TECH CO LTD
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Problems solved by technology
[0007] In the above method, ASIC can only support one of the operation modes. Once the port type of the external DSP is changed, the chip cannot be used. This undoubtedly limits the application of ASIC and the scope of use of the chip, and reduces the chip. Flexibility, but also bring a lot of modification workload to DSP software
In addition, if both big-endian and little-endian operation modes are required to be supported, it is necessary to require EMIF to only use the word access operation mode, but this cannot be performed on some half-words or bytes of internal data. operation, often resulting in complicated operation and difficult control
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[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0045] In this embodiment, the DSP is selected from the CX64 series, which is connected to the ASIC through the EMIF interface, and the ASIC uses a little-endian mode inside. The byte signal input by the DSP to the ASIC is 4bit, and the data signal is 32bit, which is set to 32h’aabbccdd.
[0046] Referring to FIG. 1 , the mode conversion device of this embodiment includes two parts: a mode selection unit and a mode conversion unit.
[0047] The mode selection unit is a register, which is used to determine whether the EMIF interface of the external DSP uses the big-endian operation mode or the little-endian operation mode. The external DSP inputs the signal to the register through the byte selection line of the EMIF interface to configure its parameters, and agrees with the ASIC in advance which signal the mode selection unit register...
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The invention discloses a device and method to transform the EMIF interface mode. The device includes a mode selecting unit and a mode transforming unit. The DSP determines that if the present mode is correspondence to the mode of the slug using, the result is output to the mode transforming unit which transforms the byte signal of the DSP and the data signal into the slug using mode according to the output of the mode selecting unit. The invention can make the slug support the big-endian and the little-endian mode at the same time whether the EMIF interface uses the mode of the word, halfword or the byte.
Description
technical field [0001] The invention relates to chip interface technology, in particular to a device and method for supporting mode conversion of an external memory (EMIF, the External Memory Interface). Background technique [0002] The scalability and flexibility of the chip are very important goals in the current ASIC (Application Specific Integrated Circuit) design, which not only requires the chip to perform more and more complex functions, but also requires the chip to be able to adapt to various complex application scenarios. The scalability and flexibility of the chip have rich meanings, including the expansion of some functions of the chip, the chip supports different interfaces, and supports different operation modes of the interface. Among them, the scalability and flexibility of the chip interface is an important aspect. The EMIF interface of a digital signal processor (DSP, Digital Signal Processor) is an important type of interface. The interface has two opera...
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IPC IPC(8): G06F3/06
Inventor 王菁
Owner HUAWEI TECH CO LTD