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2 read operations, Peripheral architecture – Texas Instruments VLYNQ Port User Manual

Page 15

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2.5.2

Read Operations

Address

translation

commands

Outbound

Outbound
command

FIFO

data

Return

FIFO

data

FIFO

Return

command

Inbound

FIFO

Registers

translation

Address

TxSM

8B/10B

encoding

Serializer

commands

Inbound

RxSM

Deserializer

decoding

8B/10B

Serial
TxData

Serial
RxData

System clock

Address

translation

Registers

commands

Inbound

translation

Address

commands

Outbound

8B/10B

decoding

FIFO

FIFO

command

Inbound

data

Return

FIFO

RxSM

Deserializer

RxData

Serial

encoding

8B/10B

VLYNQ Clock

command

Return

data

FIFO

Outbound

TxSM

Serializer

TxData

Serial

Slave

config bus

interface

VLYNQ Clock

System clock

Local VLYNC

Remote VLYNQ

Master

config bus

interface

Slave

config bus

interface

Master

config bus

interface

Peripheral Architecture

Read requests from the slave configuration bus interface are written to the outbound CMD FIFO (similar to
the write requests). Data is subsequently read from the FIFO and encapsulated into a read request
packet. The packet is encoded and serialized before it is transmitted to the remote device. Next, the
remote device deserializes, decodes the receive data, and writes the receive data to the inbound CMD
FIFO. After reading the address from the FIFO, a master configuration bus interface read operation
initiates in the remote device. When the remote master configuration bus interface receives the read data,
the data is written to the return data FIFO before it is encoded and serialized. When the receive data
reaches the local VLYNQ module, it is deserialized, decoded, and written to the return data FIFO (local
device). Finally, the read data is transferred on the local device’s slave configuration interface.

The data flow between two connected VLYNQ devices with read requests that originate from the DM644x
device is shown in

Figure 6

. The remote VLYNQ device returns the read data. Read data is shown with

dotted arrows.

Figure 6. Read Operations

SPRUE36A – September 2007

VLYNQ Port

15

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