TSS461F datasheet(45/57 Pages) ATMEL

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7615A–AUTO–02/06

TSS461F

Retries,

Rearbitrate and

Abort

Retries and rearbitrate commands are located, in the Transmit Control Register and in the Com-

mand Register, respectively. An abort command is located in each channel register set, in the

Message Length & Status Register (base_address + 0x03). These three commands are avail-

able only when the TSS461F is producer.

Figure 25. Transmit Function

Retries

The purpose of retries feature is to provide, the capability of retrying a transmit request in case

of failure, when a node tries to reach another node, either on normal DATA frame or on REPLY

REQUEST frame.

The maximum of retries is programmable through MR[3:0] of the Transmit Control Register

(0x01). When a channel is enable – bit CHTx= 0 of Message Length & Status Register, a 4-bit

counter is loaded with MR[3:0]. At each attempt, this counter will be countdown. To 0, an IT TE

is set in the Interrupt Status Register (0x09), and the transmission is stopped.

MR[3:0] = 1 indicates 1 retry, hence 2 transmission attempts will be performed (see Table 4).

The number of retries performed, as well as the current channel number associated, can be

read in the Transmission Status Register (0x05).

The Last Error Status Register (0x07) informs about the trouble encountered:

Activate

Ch. Enabled in

Xmit Mode?

Select the lowest

Ch. number and

load”Max - retries”

yes

Abort activated

on current Ch.?

yes

Disable of

current Ch.

Wait for bus free

(EOF+IFS= 12 Timeslots)

Retry needed?

abort

Abort required

rearbitrate?

on current Ch.

rearbitrate

yes

Transmit frame

and wait for the end

Decrement

retry counter

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