
TSS461C
26
Rev. D (22 Feb 01)
9.2.5. Line Status Register (0x04) :
7
6
5
4
3
2
1
0
SPG
IDG
Sc
Sb
Sa
TXG
RXG
Read only register.
Default value after reset : 0bx01xxx00.
This register reports the operation mode of the TSS461C in the Sleep an Idle bits (Command Register located at
address 0
×
03) as well as the diagnosis system status bits S2 to S0 discussed in section 8.
SPG
: Sleeping
IDG
: Idling.
Default mode at reset
Sa, Sb and Sc
: Diagnosis system status bits
Sa and Sb
Table 7. Diagnosis System Status Bits
Sb
Sa
COMMUNICATION INDICATION
0
0
Nominal mode, differential communication
0
1
Degraded over DATA, fault on DATA
1
0
Degraded over DATA, fault on DATA
1
1
Major error, fault on DATA and DATA
Sc
: As soon as one of the three inputs (RXD2, RXD1, RXD0) differs
from the others in the input comparison analysis performs by the
diagnosis system, S2 is set.
The only ways to reset this status bit are through the RI signal or a
general reset.
TXG
: Transmitting.
If this status bit is active, it indicates that the TSS461C has choosen an
identifier to transmit, and it will continue to make transmission attempt
for this message until it succeeds or the retry count is exceeded.
RXG
: Receiving.
The receiving indicates that there is activity on the bus.
NOTE : For safe modification of active channel registers both bits
should be inactive (except
“
abort
”
command).
9.2.6. Transmission Status Register (0x05) :
7
6
5
4
3
2
1
0
NRT3
NRT2
NRT1
NRT0
IDT3
IDT2
IDT1
IDT0
Read only register.
Default value after reset : 0x00.
The transmission Status register contains the number of retries made up-to-date, according to the Table 4. , and the
channel currently in transmission.
NRT [3:0]
: Number of retries done in transmission.
IDT [3:0]
: Channel number currently in transmission.