
Development Tools and Support
B-4
MC68302 USER’S MANUAL
MOTOROLA
Supports external loopback between two channels or on the same channel
Trace option for reporting to system management each primitive issued by the LAPD
module to the layer 3 module or to layer 2 management
The LAPB module features are as follows:
Implements
1988 CClTT Recommendation X25,
Supports up to twelve distinct physical channels with each operating as an independent
station
Modulo 8 or modulo 128 operation
Applicable for DTE and DCE applications
Uses dedicated transmit pool for fast control frame generation
Dynamic modification of protocol parameters
Independent of layer 1 and layer 3 implementation
Message-oriented interface
Independent configuration of upper and lower layer modules interfacing with each
LAPB link
Special mode for internal loopback (frames are not sent to the driver)
Supports external loopback between two MC68302 serial channels or on the same
MC68302 serial channel
Trace option for reporting to system management each primitive issued by the LAPB
module to layer 3 or to layer 2 management
chapters 2.1 through 2.4
The X.25 module features are as follows:
Fully implements 1988 CCITT Recommendation
May be used with both layer 2 modules: LAPD or LAPB
Unlimited number of layer 2 entities (interfaces)
Supports up to 4095 logical channels for each interface
Many DTE/DCE interface parameters (configurable for each interface):
—- DTE/DCE
—- Modulo 8/128
—- Window size
—- Maximum receive and transmit packet lengths
X.25, chapters 3.1 through 7.3
Layer 4 message fragmentation/assembly using M-BIT
Q-BIT support
All standard CCITT X.25 facilities
Compatible with X.213 interface primitives
Link parameters (configurable separately for each interface):
—- Interface ID