MK50H28N ST Microelectronics, Inc., MK50H28N Datasheet - Page 14

• Manufacturer Part Number: MK50H28N
• Description: Multi Logical Link Frame Relay Controller
• Manufacturer: ST Microelectronics, Inc.

MK50H28
STATUS ENQUIRY is received, the device is-
sues the LMI Received primitive 13 (with
PPARM=1) and expects the host to respond with
LMI Status Request Primitive 11 with UPARM=0
(when the host is ready to transmit the Full
STATUS frame).
Asynchronous STATUS frames may be transmit-
ted by placing the data to be transmitted into the
appropriate buffer and issueing Primtive 11 with
UPARM=2.
LMI frames received in any mode will not cause
Receive Interrupts (RINT) to be generated, nor
will the Receive Interrupt Ring be updated. In-
stead, the MK50H28 will issue primitives corre-
sponding to those LMI Frame received which are
not automatically processed by the MK50H28 (i.e.
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non "LIV only" frames). See the description of
primitives in section 4.1.2.2. In addition to the
primitives, bits 09-11 of the Receive Message De-
scriptor 0 (RMD0) for the LMI channel will indicate
the type of frame received. See section 4.3.1.2
for details.
In Non-Auto-LMI mode of operation, LMI frames
received on the LMI Channel (typically DLCI 0)
will be written into the receive buffer as Transpar-
ent or SVC frames.
Also refer to Detailed Programming Procedures
(section 4.4) for more information on using the
device in the previously mentioned modes of Pro-
tocol Operation.