Texas Instruments VLYNQ Port manual Write Operations

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Peripheral Architecture

2.5.1Write Operations

Write requests that initiate from the slave configuration bus interface of the local device write to the outbound command (CMD) FIFO. Data is subsequently read from the FIFO and encapsulated in a write request packet. The address is translated, and the packet is encoded and serialized before being transmitted to remote device. The remote device subsequently deserializes and decodes the receive data and writes it into the inbound CMD FIFO. A write operation initiates on the remote device’s master configuration bus interface after reading the address and data from the FIFO.

The data flow between two VLYNQs that are connected is shown in Figure 5. In the example shown in Figure 5, the write originates from the DM644x device.

Figure 5. Write Operations

			System￿clock		VLYNQ￿clock
								Serial
	Slave	Address	Outbound	Outbound		8B/10B		TxData
config￿bus				command	TxSM		Serializer
		translation	commands			encoding
	interface			FIFO
				Return
				data
				FIFO
		Registers				Local￿VLYNQ
				Return
				data
				FIFO
	Master	Address	Inbound	Inbound		8B/10B		Serial
config￿bus				command	RxSM		Deserializer
		translation	commands			decoding		RxData
	interface			FIFO
			System￿clock		VLYNQ￿Clock
								Serial
	Slave	Address	Outbound	Outbound		8B/10B		TxData
config￿bus
				command	TxSM		Serializer
		translation	commands			encoding
	interface
				FIFO
				Return
				data
				FIFO
		Registers				Remote￿VLYNQ
				Return
				data
				FIFO
								Serial
	Master	Address	Inbound	Inbound		8B/10B		RxData
config￿bus				command	RxSM		Deserializer
		translation	commands			decoding
	interface			FIFO
14	VLYNQ Port						SPRUE36A –September 2007

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