CR16MCS5VJI8 Datasheet

IC型号：
CR16MCS5VJI8
PDF描述：
Family of 16-bit CAN-enabled CompactRISC Microcontrollers
文件大小：
713.21KB
PDF页数：
156页
芯片厂家：
NSC

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鈥?If only one device is on the bus and this device trans-

mits a message, it will get no acknowledgment. This

will be detected as an error and the message will be re-

peated. When the device goes 鈥榚rror passive鈥?and de-

tects an acknowledge error, the TEC counter is not

incremented. Therefore the device will not go from 鈥榚r-

ror passive鈥?to the 鈥榖us off鈥?state due to such a condi-

tion.

20.2.3

Bit Time Logic

CR16CAN divides a nominal bit time into three time seg-

ments: synchronization segment, time segment 1 (TSEG1)

and time segment 2 (TSEG2). Figure52 shows the various

elements of a CAN bit time.

CAN Bit Time

The number of time quanta in a CAN bit (CAN Bit Time) lies

between 4 and 25. The sample point is positioned between

TSEG1 and TSEG2 and the transmission point is positioned

at the end of TSEG2.

In the Bit Time Logic (BTL), the CAN bus speed and the Syn-

chronization Jump Width can be configured by the user.

INTERNAL

TIME QUANTA

CLOCK

ONE TIME QUANTUM

4 to 25 tq

1 tq

TIME SEGMENT 1 (TSEG1)

2 to 16 tq

TIME SEGMENT 2 (TSEG2)

1 to 8 tq

A = synchronization segment (Sync)

SAMPLE

POINT

TRANSMISSION

POINT

Figure 52. Bit Timing

The

time segment 1

includes the propagation segment and

the phase segment 1 as specified in the CAN specification

2.0.B. The length of the time segment 1 in time quantas (tq)

is defined by the TSEG1[3:0] bits.

The

time segment 2

represents the phase segment 2 as

specified in the CAN specification 2.0.B. The length of the

time segment 2 in time quantas (tq) is defined by the

TSEG2[2:0] bits.

The

Synchronization Jump Width

(SJW) defines the max-

imum number of time quanta (tq) by which a received CAN

bit can be shortened or lengthened in order to achieve re-

synchronization on 鈥榬ecessive鈥?to 鈥榙ominant鈥?data transitions

on the bus. In the CR16CAN implementation the SJW has to

be configured less or equal to TSEG1 or TSEG2, whatever is

smaller.

Synchronization

A CAN device expects the transition of the data signal to be

within the synchronization segment of each CAN bit time.

This segment has the fixed length of one time quantum.

However, two CAN nodes never operate at exactly the same

clock rate and furthermore the bus signal may deviate from

the ideal waveform due to the physical conditions of the net-

work (bus length and load). In order to compensate for the

various delays within a network, the sample point can be po-

sitioned by programming the length of time segments 1 and

2 (see Figure52).

In addition to that, two types of synchronization are support-

ed. The BTL logic compares the incoming edge of a CAN bit

with the internal bit timing. The internal bit timing can be

adapted by either hard or soft synchronization (re-synchroni-

zation).

Hard synchronization

is done at the beginning of a new

frame with the falling edge on the bus while the bus is idle.

This is interpreted as the SOF. It restarts the internal logic.

Soft synchronization

is used during the reception of a bit

stream to lengthen or shorten the internal bit time. Depending

on the phase error (e), the time segment 1 may be increased

or the time segment 2 may be decreased by a specific value,

the re-synchronization jump width (SJW).

The phase error is given by the deviation of the edge to the

SYNC segment, measured in CAN clocks. The value of the

phase error is defined as:

e = 0, if the edge occurs within the SYNC segment.

e > 0, if the edge occurs within TSEG1

e < 0, if the edge occurs within TSEG2 of the previous bit.

Re-synchronization is performed according to the following

rules:

鈥?/div>

If the magnitude of e is less or equal to the programmed

value of SJW, re-synchronization will have the same effect

as hard synchronization.

鈥?/div>

If e > SJW, the time segment 1 will be lengthened by the

value of the SJW (see Figure53).

鈥?/div>

If e < -SJW, the time segment 2 will be shortened by the

value SJW (see Figure 54).

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