SJA1000 NXP Semiconductors, SJA1000 Datasheet - Page 39

• Manufacturer Part Number: SJA1000
• Manufacturer: NXP Semiconductors

Specifications of SJA1000

• Data Rate: 1000Kbps
• Number Of Transceivers: 1
• Power Down Mode: Sleep
• Standard Supported: CAN 2.0B
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Package Type: PDIP
• Supply Current: 15mA
• Operating Temperature (max): 125C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Automotive
• Mounting: Through Hole
• Pin Count: 28
• Lead Free Status / RoHS Status: Compliant

Philips Semiconductors
6.4.13
The global layout of the transmit buffer is shown in Fig.7.
One has to distinguish between the Standard Frame
Format (SFF) and the Extended Frame Format (EFF)
configuration. The transmit buffer allows the definition of
one transmit message with up to eight data bytes.
6.4.13.1
The transmit buffer layout is subdivided into descriptor and
data fields where the first byte of the descriptor field is the
frame information byte (frame information). It describes
the frame format (SFF or EFF), remote or data frame and
the data length. Two identifier bytes for SFF or four bytes
for EFF messages follow. The data field contains up to
eight data bytes.
6.4.13.2
The bit layout of the transmit buffer is represented in
Tables 25 to 27 for SFF and Tables 28 to 32 for EFF.
The given configuration is chosen to be compatible with
the receive buffer layout (see Section 6.4.14.1).
2000 Jan 04
handbook, full pagewidth
Stand-alone CAN controller
T
RANSMIT BUFFER
Transmit buffer layout
Descriptor field of the transmit buffer
Fig.7 Transmit buffer layout for standard and extended frame format configurations.
CAN address 16
a. Standard frame format.
17
18
19
20
21
22
23
24
25
26
27
28
TX frame information
TX data byte 1
TX data byte 2
TX data byte 3
TX data byte 4
TX data byte 5
TX data byte 6
TX data byte 7
TX data byte 8
TX identifier 1
TX identifier 2
unused
unused
39
CAN address 16
The transmit buffer has a length of 13 bytes and is located
in the CAN address range from 16 to 28.
Note, that a direct access to the transmit buffer RAM is
possible using the CAN address space from 96 to 108.
This RAM area is reserved for the transmit buffer.
The three following bytes may be used for general
purposes (CAN address 109, 110 and 111).
b. Extended frame format.
17
18
19
20
21
22
23
24
25
26
27
28
TX frame information
TX data byte 1
TX data byte 2
TX data byte 3
TX data byte 4
TX data byte 5
TX data byte 6
TX data byte 7
TX data byte 8
TX identifier 1
TX identifier 2
TX identifier 3
TX identifier 4
MGK621
Product specification
SJA1000