TSS461C datasheet(45/57 Pages) ATMEL

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TSS461C

4193G–AUTO–12/04

Retries, Rearbitrate

and Abort

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

the Command Register, respectively. An abort command is located in each channel reg-

ister set, in the Message Length & Status Register (base_address + 0x03). These three

commands are available only when the TSS461C is producer.

Figure 24. 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 number of retries is programmable through MR[3:0] of the Transmit Con-

trol 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 asso-

ciated, can be read in the Transmission Status Register (0x05).

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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