CONTROLINK86 SMSC, CONTROLINK86 Datasheet - Page 29

• Manufacturer Part Number: CONTROLINK86
• Description: Development Software Embedded Networking Software
• Manufacturer: SMSC

Specifications of CONTROLINK86

• Tool Function: Compiler
• Tool Type: Compiler
• Processor Series: 80x86
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ControLink86 Realtime Networking Software
which will verify that the physical hardware is operational and that the receiving CPU is functional and
recognizing packets.
Example:
3.6.2.4DATA REQUEST
The DATA request procedure is the process through which application relevant data is transferred. When
the DATA request function is initiated, ControLink sends out a 802.2 UI (Unnumbered Information) frame.
This procedure does not invoke an automatic response from the ControLink software. When Data frames
are sent, the application software must decode the data and respond if necessary.
The Idea of the Data Request is illustrated by the Figure 8.
Example:
…
/* initiate a test with another station */
event = TEST_REQUEST
status = llc1_request (x, y, event, & lsap [x]);
…
event = DATA_REQUEST;
lsap[SAP].dstation = dest_id;
/* initialize pointer */
bufptr = lsap[SAP].msgptr;
*bufptr = ‘H’;
MAC Packet SENDING and RECEIVING
Note: ACK (Acknowledgement) packets are not represented here
Application
(SENDER)
Indication
UI (Data)
UI (Data)
Request
Host
Burst
Alert
0x01
SRC
ID
Logical Link
(SENDER)
Destination
DEST
Control
Source
ID
SAP x
SAP x
FIGURE 8 - DATA TRANSFER PROCEDURE
DEST
ID
Count
3-253
0x00
Count
1-256
MAC Packet
MAC Packet
(MAC Layer)
DSAP
Long packet count
MEDIUM
y
29
SSAP
x
0x13
Data Indication
(RECEIVER)
Data Request
Logical Link
Destination
to Class1
Control
Source
Sender
SAP y
SAP y
Driver
to the
DATA
CRC
(RECEIVER)
Application
Indication
UI (Data)
Message
CRC
Reply
Optional
Host