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You can change your ad preferences anytime. APB protocol v1. Upcoming SlideShare. Like this presentation? Why not share! Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode. Published in: Design. Full Name Comment goes here. Are you sure you want to Yes No. Kavya Hp , Show More. No Downloads. Views Total views.
Actions Shares. Embeds 0 No embeds. No notes for slide. APB Protocol v 1. Denotes ARM processor signal names. Also used for terms in descriptive lists, where appropriate.
You can enter the underlined text instead of the full command or option name. They appear in normal font in running text. Timing diagrams 7. It provides a low cost interface that is optimized for minimal power consumption and reduced interface complexity. The APB has unpipelined protocol. Every transfer takes at least two cycles. You can use it to provide access to the programmable control registers of peripheral devices. With no wait states The write transfer starts with the address, write data, write signal and select signal all changing after the rising edge of the clock.
The first clock cycle of the transfer is called the Setup phase. The address, data and control signals all remain valid throughout the Access phase. The transfer completes at the end of this cycle. Write transfer with wait states This reduces power consumption. With no wait states Figure shows a read transfer. The timing of the address, write, select, and enable signals are as described in Write transfers on page The slave must provide the data before the end of the read transfer However, you can add any number of additional cycles, from zero upwards.
Error conditions can occur on both read and write transactions. Error response contd.. This is peripheral-specific and either is acceptable. When a write transaction receives an error this does not mean that the register within the peripheral has not been updated. Read transactions that receive an error can return invalid data.
There is no requirement for the peripheral to drive the data bus to all 0s for a read error. This is true for both existing and new APB peripheral designs. Figure on page shows a read transfer completing with an error response.
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Advanced Microcontroller Bus Architecture
It facilitates development of multi-processor designs with large numbers of controllers and components with a bus architecture. Since its inception, the scope of AMBA has, despite its name, gone far beyond microcontroller devices. These protocols are today the de facto standard for embedded processor bus architectures because they are well documented and can be used without royalties. An important aspect of an SoC is not only which components or blocks it houses, but also how they interconnect. AMBA is a solution for the blocks to interface with each other. The AMBA specification defines an on-chip communications standard for designing high-performance embedded microcontrollers. It is supported by ARM Limited with wide cross-industry participation.
AMBA APB Protocol Specification