SLIMBUS SPECIFICATION PDF

The SLIMbus specification transfers audio data within an SoC design very efficiently, and also supports transport of asynchronous data as well as control data. Its multi-drop architecture makes the SLIMbus specification optimal over existing audio standards, like I2S and PCM, eliminating the need for any control bus on audio components. For flexible and robust data connections between various SLIMbus devices, the IP uses a synchronous, two-wire TDM frame structure and surrounding bus arbitration mechanisms and message structures. It is an ideal solution for providing a standard interface from peripheral components especially for audio to baseband or application processors.

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First meeting was a teleconference on 3-Aug First meeting as a full Working Group on April SLIMbus specification v1. SLIMbus specification V1. Manager Device[ edit ] The Manager Device is responsible for configuring SLIMbus, and performs bus administration administration of Components and Devices, bus configuration, and dynamic channel allocation and is typically located in a baseband or application processor rather than in a peripheral component.

Interface Device[ edit ] The Interface Device provides bus management services, monitors the Physical Layer for errors, reports information about the status of a SLIMbus Component, and otherwise manages the Component such that the Devices within it will function properly on the bus. A Generic Device is generally considered to be the device to provide certain application functionality, for example, conversion from digital audio to analog DAC and vice versa ADC.

SLIMbus Ports are normally used for digital audio data flow, but may also be used for other digital data flow. Port capabilities vary depending upon the Device and are to be specified in the Component data sheet. Typical Port attributes include data direction, i.

SLIMbus CLK frequencies and data transport protocols will support all common digital audio converter over-sampling frequencies and associated sample rates. Bandwidth allocation for various data organizations, from 4-bits to bits or more, can be done by grouping 4-bit Slots.

Frame[ edit ] A Frame is defined as 0 through contiguous Slots and are transmitted as S0, followed by S1, S2 … S in that order. The active Framer writes all Framing Information to the Data line at the appropriate time. A Subframe is partitioned into 1 or more slots of Control Space, followed by 0 or more slots of Data Space.

As shown in Figure 4 below, the Subframe length is programmable to 6, 8, 24 or 32 contiguous Slots 24, 32, 96 or Cells. The number of possible Subframes per Frame is therefore 32, 24, 8, or 6 respectively. The Subframe configuration used can be dynamically changed depending upon the data flow requirements of the applications being supported at the time.

The remainder is available for more general control messages. Superframe[ edit ] A Superframe is defined as eight contiguous Frames Slots.

Frames within a Superframe are labeled Frame 0 through Frame 7. The duration of a Superframe is fixed in terms of Slots and, therefore, Cells , but not in terms of time. The Control Space carries bus configuration and synchronization information as well as inter-Device Message communication. Data Space, when present, carries application-specific information such as isochronous, and asynchronous data streams.

SLIMbus Components convey control and data information between each other using Control and Data Channels with Transport Protocols to achieve the required system operation. Messages are used for Control functions. Channels can be established between a pair of Devices inter-Device communication , or between one Device and many Devices broadcast communication , or in the case of the Message Channel, from all devices to all other devices shared.

The Framing Channel occupies Slots 0 and 96 of each Frame. Since all Subframe lengths divide 96, these Slots are always available for the purpose. Slot 0 holds a fixed Frame Sync symbol , while Slot 96 holds 4 bits of a Framing Information word.

Over the course of a Superframe, 32 bits of Framing Information are available. Some of these hold a fixed bit pattern used to acquire Superframe synchronization 0xxxx2 , while the others hold other critical configuration information.

This "guide byte" is normally 0, but if a control message straddles a Superframe boundary, it indicates the number of bytes until the end of that message. The Message Channel consists of all remaining Slots.

It carries various types of information including bus configuration announcements, Device control and Device status. The format of Control Space is determined by a 5-bit Subframe mode identifier transmitted in the Framing Information word. This communicates the Subframe length and the number of control Slots.

The number of control Slots is limited to the choices of 1, 2, 3, 4, 6, 8, 12, 16, or Adding the limitations that the number of control Slots must be less than the Subframe length produces 26 valid combinations.

Modes 1—3, 20 and 30 are not valid. Data Channels[ edit ] Data Channels are one or more contiguous Data Slots Segments and are dynamically created by the active Manager depending on the application and size of Data Space available. A Data Channel, and therefore the structure of a Segment, is defined by parameters such as Data rate, type, field length, and required Transport Protocol. The data payload may or may not fill the entire allotted DATA field.

Figure 5: Segment Organization Data Channel Transport Protocols and Flow Control[ edit ] A Data Channel has exactly one data source at a time and may have one or more data sinks depending upon the Transport Protocol used in the channel. Flow Control in the Channel, if needed, depends on the Devices and the type of Data involved. TAG bits are used to carry the flow control information. For data flow between Ports attached to Channels, SLIMbus supports a small group of frequently used Transport Protocols including a User Defined Transport Protocol which define data flow type, flow control mechanism, and a side-channel if any for any additional application-specific information.

A summary of the Transport Protocols is shown in Table 1.

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First meeting was a teleconference on 3-Aug First meeting as a full Working Group on April SLIMbus specification v1. SLIMbus specification V1. Manager Device[ edit ] The Manager Device is responsible for configuring SLIMbus, and performs bus administration administration of Components and Devices, bus configuration, and dynamic channel allocation and is typically located in a baseband or application processor rather than in a peripheral component.

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The control channel is used for various control functions such as bus management, configuration and status updates. These messages can be unicast e. Data channel uses dedicated ports on the device. A manager device is responsible for enumeration, configuration, and dynamic channel allocation. Every bus has 1 active manager. A generic device is a device providing application functionality e.

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First meeting was a teleconference on August 3, First meeting as a full Working Group on April 12, SLIMbus specification v1. SLIMbus specification V1. Manager Device[ edit ] The Manager Device is responsible for configuring SLIMbus, and performs bus administration administration of Components and Devices, bus configuration, and dynamic channel allocation and is typically located in a baseband or application processor rather than in a peripheral component. Interface Device[ edit ] The Interface Device provides bus management services, monitors the Physical Layer for errors, reports information about the status of a SLIMbus Component, and otherwise manages the Component such that the Devices within it will function properly on the bus.

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