TSS461C datasheet(16/57 Pages) ATMEL

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TSS461C

4193G–AUTO–12/04

generate the RTR bit, the requesting module will continue with the frame check, the

EOD and the EOF.

•

During this frame, the requested module will only generate the acknowledge, and

only if this was requested by the initiator through the RAK bit.

•

Finally, the deferred reply frame in Figure 14, which is sent when a module has

prepared a reply for a reply request that has been received earlier.

This frame is similar to the normal data frame with the exception being the R/W bit

that has changed state.

Figure 11. Normal Data Frame

FRAME

on Bus

TRANSMITTING

FRAME

on Bus

TRANSMITTING

Module

CRC

SOF

IDENTIFIER

DATA

EOF

Module

RECEIVING

Module

RECEIVING

Module

: Positive from Receiver because RAK is Recessive

RAK

EXT

R/W

RTR

ACK

: Recessive for acknowledge from Transmitter

: Recessive from Transmitter

: Dominant from Transmitter

: Dominant from Transmitter – (*) Manchester bit

With Acknowlegment

Without Acknowlegment

: Absent from Transmitter and from Receiver because RAK is Dominant

RAK

EXT

R/W

RTR

ACK

: Dominant for no acknowledge from Transmitter

: Recessive from Transmitter

: Dominant from Transmitter

: Dominant from T ransmitter – (*) Manchester bit

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