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| 型号： | MSM6636JS |
| 厂商： | OKI ELECTRIC INDUSTRY CO LTD |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 1 CHANNEL(S), 41.6K bps, LOCAL AREA NETWORK CONTROLLER, PQCC18 |
| 封装： | 0.290 INCH, 1.27 MM PITCH, PLASTIC, QFJ-18 |
| 文件页数： | 33/72页 |
| 文件大小： | 707K |
| 代理商： | MSM6636JS |
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MSM6636/6636B User’s Manual
Function Details
5 – 1
5. FUNCTION DETAILS
5.1 Arbitration Function
Multiple nodes are connected to the LAN bus, so if multiple nodes start to transmit at the same time, the
MSM6636/6636B perform nondestructive collision detection, and control priority using the arbitration function.
Only the node transmitting a message that has the highest priority can complete a transmission. Priority is set so
that the node outputting in dominant status is higher than the node outputting in passive status. The
MSM6636/6636B constantly monitor the LAN bus status, even during transmission, comparing the output data of
local nodes and the LAN bus status. If a local node is in passive status output, but the dominant status is detected on
the LAN bus, the MSM6636/6636B judge this as a collision, and immediately stop output.
This is how bus arbitration is performed.
Transmit Node A
Transmit Node B
Transmit Node C
LAN Bus
SOF
00010
Dominant status output
Node B gains priority.
Arbitration Loss
5.2 Address Filter Function
The MSM6636/6636B have physical addresses that are unique to each node, and functional addresses that are set
for each functional block. Based on these address values, the address filter function automatically judges whether
data on the LAN bus becomes the receive target.
Set the physical address value to each node and set the functional address value for each functional block (15 types
can be set) from the host CPU side.
The MSM6636/6636B select either a physical address or functional address by the physical address/functional
address decision bit (Y) in a receive message, and execute collating with each address value of the internal register.
If the same address is detected, the MSM6636/6636B judge this as a message to their own node, and enter receive
operation. Otherwise the MSM6636/6636B do not receive the message in that frame.
SOF
(A)
(B)
(C)
DATA
EOF
Address Filter
Selects address type by Y bit of 3-byte header (A)
0: functional address
1: physical address
Executes collating between listener address value of (B)
and address value set to internal register.
Physical Address
Functional Address
… …
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