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MK50H28

MULTI LOGICAL LINK FRAME RELAY CONTROLLER

STMicroelectronics 

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.

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.

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