Texas Instruments SPRU938B 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 DM643x 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

SPRU938B –September 2007 VLYNQ Port 13

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