MOD5234-100IR NetBurner Inc, MOD5234-100IR Datasheet - Page 476

• Manufacturer Part Number: MOD5234-100IR
• Description: MOD5234 10/100 ETHERNET MODULE
• Manufacturer: NetBurner Inc
• Type: Controllers & Processorsr

Specifications of MOD5234-100IR

• Interface: I²C, SPI, UART
• Voltage - Supply: 2.5V
• Mounting Type: Surface Mount
• Package / Case: Module
• Product: Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Format: -
• Baud Rates: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q4483564

FlexCAN
21-22
MBn[RTR
Rx New Frame
1
Note that for transmit message buffers (see
BEFORE
Rx Code
X
0
1
]
0XY1
0000
0100
0010
0110
1
Initial Tx
Code
1000
1100
1100
The CPU should not try
was overwritten into a
updating the contents
INACTIVE: MB is not
EMPTY: MB is active
of the MB with a new
OVERRUN: A frame
Table 21-13. Message Buffer Code for Rx Buffers
to access the MB.
Table 21-14. Message Buffer Code for Tx Buffers
BUSY: Flexcan is
FULL: MB is full.
receive frame.
Description
and empty.
full buffer.
active.
Transmission
Successful
Code After
1000
0100
MCF5235 Reference Manual, Rev. 2
—
Table
Rx Code
Rx New
AFTER
Frame
0010
0010
0010
0010
0110
0110
0110
21-14), the BUSY bit should be ignored upon read.
—
INACTIVE: Message buffer not ready for transmit and will
participate in the arbitration process.
Data frame to be transmitted once, unconditionally. After
transmission, the MB automatically returns to the INACTIVE
state.
Remote frame to be transmitted unconditionally once, and
message buffer becomes an Rx message buffer with the same
ID for data frames.
MB does not participate in the matching process.
MB participates in the matching process. When a
frame is received successfully, the code is
automatically updated to FULL.
The act of reading the control & status (C/S) word
followed by unlocking the MB does not make the
code return to EMPTY. It remains FULL. If a new
frame is written to the MB after the C/S word was
read and the MB was unlocked, the code still remains
FULL.
If the MB is FULL and a new frame should be written
into this MB before the CPU had time to read it, the
MB is overwritten, and the code is automatically
updated to OVERRUN.
If the code indicates OVERRUN but the CPU reads
the C/S word and then unlocks the MB, when a new
frame is written to the MB, the code returns to FULL.
If the code already indicates OVERRUN, and yet
another new frame must be written, the MB will be
overwritten again, and the code will remain
OVERRUN.
An EMPTY buffer was written with a new frame (XY
was 01).
A FULL/OVERRUN buffer was overwritten (XY was
11).
Description
Comment
Freescale Semiconductor