Block Diagram Of Can Controller - Fujitsu MB90895 Series Hardware Manual

16.2

Block Diagram of CAN Controller

The CAN controller consists of two types of registers; one controls the CAN controller
and the other controls each message buffer.
I Block Diagram of CAN Controller
2
F MC-16LX bus
CPU operating
clock
BTR
CSR
NS1,0
RTEC
BVALR
TREQR
TCANR
TRTRR
RFWTR
TCR
TIER
RCR
RIER
RRTRR
ROVRR
AMSR
AMR0
AMR1
IDR0 to 7
DLCR0 to 7
DTR0 to 7
RAM
IDER
LEIR
The pin names in the block diagram are as follows:
TX pin: P43/TX
RX pin: P44/RX
Figure 16.2-1 Block Diagram of CAN Controller
Prescaler
(divided by 1 to 64)
PSC
TS1
TS2
RSJ
TOE
TS
RS
HALT
Node status
Node status
NIE
transfer interrupt transfer interrupt
NT
generating circuit
signal
Transmission
buffer clear Transmission buffer
Transmission
determine circuit
buffer
Transmission buffer
Set and clear of transmission buffer
Transmission
Transmission completion
interrupt generating circuit
competion
interrupt signal
Setting of reception buffer
Reception
Reception complemet
interrupt generating completion
circuit
interrupt circuit
Set and clear of reception buffer
ID select
Setting of
reception buffer
0
1 Acceptance
Reception buffer
determine circuit
filter
Reception buffer
RAM address
Reception buffer, transmissio buffer, reception DLC, transmission DLC, ID selection
generating circuit
Operating clock (TQ)
Sing segment
Bit timing generating circuit
Time segment 1
Time segment 2
Error
control
circuit
Transmission/
reception sequencer
Acceptance
Data
filter control circuit
counter
Transmission
ID selection
Reception
DLC
DLC
Bit error, stuff error,
CRC error, frame error,
ACK error
Transmission shift
register
generating
Transmission
circuit
DLC
CRC error
Reception
CRC generating circuit/
DLC
error check
Reception shift
register
Arbitration lost
Bit error
ACK error
Form error
CHAPTER 16 CAN controller
Idle, interrupt,
Bus state
suspend,
judge
transmission,
circuit
reception,
error, over load
Error frame
generating circuit
Over load frame
generating circuit
Output
Arbitration lost
Pin
driver
Stuffing
CRC ACK
generating
circuit
Stuff error
Destuffing/
stuffing error check
Arbitration
check
Bit error
check
Acknowledge
error check
Input
Form error
Pin
latch
check
TX
RX
479