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VLYNQ bus Description

VLYNQ is a serial communications interface [full-duplex] that enables the extension of an internal bus segment to one or more external physical devices. The external devices are mapped into local, physical address space and appear as if they are on the internal bus. Multiple VLYNQ devices are daisy-chained, communication is peer-to-peer, host/peripheral. Data transferred over the VLYNQ interface is 8B/10B encoded and packetized.

The VLYNQ bus signals include 1 clock signal [CLK], and 1 to 8 Transmit lines [TX0 and TX1], and 1 to 8 Receive lines [RX0 and RX1]. All VLYNQ signals are dedicated and driven by only one device. The transmit pins of one device connect to the receive lines of the next device. The VLYNQ bus will operate at a maximum clock speed of 125MHz. However the actual clock speed is dependent on the physical device with the VLYQN. So a device may a clock speed other then 125MHz. For example a device may have an internal 100MHz [maximum] clock rate, or external 80MHz [maximum] clock rate.

When clocked at 125 MHz, a single T/R pair then delivers an effective data throughput of about 73 Mbits/s (for single, 32-bit word transfers), while a dual T/R pair implementation delivers 146 Mbits/s, and a maximum eight-channel version delivers 584 Mbits/s. In-band flow-control lets the interface independently throttle the transmit and receive data streams.

If data packets contain four or 16 words, some of the overhead is eliminated. So on a single channel, data bursts of four words per packet can deliver an effective throughput of 133 Mbits/s. With 16 words per packet, the throughput goes up to 178 Mbits/s. With the maximum eight channels, an effective throughput of over 1400 Mbits/s can be achieved with 16 words per packet. Both the direction and clock source may be software configurable [may be device dependent]. Software may also be used to set the internal clock speed [may be device dependent]. Unused clock lines are held high via an internal pull-up. Unused RX or TX lines may require an external 47k pull-down resistor [may be device dependent].. Software select-able internal pull-downs for signals may be provided on some devices.

The VLYNQ bus is a the proprietary interface developed by Texas Instruments for it's broadband products, such as modems and wireless local area networks (WLANs); voice broadband processors, digital media processors, and OMAP media processor chips. Licensing agreements for VLYNQ may be obtained from TI.
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