MC68EN360AI25VL Freescale, MC68EN360AI25VL Datasheet - Page 575

• Manufacturer Part Number: MC68EN360AI25VL
• Manufacturer: Freescale

Specifications of MC68EN360AI25VL

• Family Name: M68000
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 25MHz
• Instruction Set Architecture: RISC
• Operating Supply Voltage (max): 3.3V
• Operating Supply Voltage (min): 2.7V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 240
• Package Type: FQFP
• Lead Free Status / RoHS Status: Compliant

RESTART TRANSMIT Command . The RESTART TRANSMIT command enables the trans-
mission of characters on the transmit channel. This command is expected by the Ethernet
controller after a GRACEFUL STOP TRANSMIT command or after a transmitter error
(underrun, retransmission limit reached, or late collision). The Ethernet controller will
resume transmission from the current TBPTR in the channel’s Tx BD table.
INIT TX PARAMETERS Command . This command initializes all the transmit parameters in
this serial channel’s parameter RAM to their reset state. This command should only be
issued when the transmitter is disabled. Note that the INIT TX AND RX PARAMETERS com-
mand may also be used to reset both transmit and receive parameters.
7.10.23.10.2 Receive Commands. The following paragraphs describe the Ethernet receive
commands.
ENTER HUNT MODE Command . After a hardware or software reset and the enabling of the
channel in the SCC mode register, the channel is in the receive enable mode and will use
the first BD in the table.
The ENTER HUNT MODE command is generally used to force the Ethernet receiver to
abort reception of the current frame and enter the hunt mode. In the hunt mode, the Ethernet
controller continually scans the input data stream for a transition of carrier sense from inac-
tive to active and then a preamble sequence followed by the start frame delimiter. After
receiving the command, the current receive buffer is closed, and the CRC calculation is
reset. Further frame reception will use the next Rx BD.
CLOSE Rx BD Command . This command should not be used with the Ethernet controller.
INIT RX PARAMETERS Command . This command initializes all the receive parameters in
this serial channel’s parameter RAM to their reset state. This command should only be
issued when the receiver is disabled. Note that the INIT TX AND RX PARAMETERS com-
mand may also be used to reset both receive and transmit parameters.
7.10.23.10.3 SET GROUP ADDRESS Command. The SET GROUP ADDRESS com-
mand is used to set a bit in one of the 64 bits of the four individual/group address hash filter
registers (GADDR1–4 or IADDR1–4). The individual or group address (48 bits) to be added
to the hash table should be written to TADDR_L, TADDR_M, and TADDR_H in the param-
eter RAM prior to executing this command. The RISC controller checks the I/G bit in the
address stored in TADDR to determine whether to use the individual hash table or the group
hash table. A zero in the I/G bit implies an individual address, and a one in the I/G bit implies
a group address.
If the GRACEFUL STOP TRANSMIT command is issued and
the current transmit frame ends in a collision, the TBPTR will
point to the beginning of the collided frame, with the R-bit still set
in the Tx BD (i.e., the frame will look as if it were never transmit-
ted).
Freescale Semiconductor, Inc.
For More Information On This Product,
MC68360 USER’S MANUAL
Go to: www.freescale.com
NOTE
Serial Communication Controllers (SCCs)