TSS463 ATMEL Corporation, TSS463 Datasheet - Page 52

• Manufacturer Part Number: TSS463
• Description: VAN Data Link Controller with Serial Interface
• Manufacturer: ATMEL Corporation

Linked Channels
Figure 36. Linkage Mechanism
This Message area sharing permits either to optimize the allocation of the 128 bytes of DATA, either to perform some spe-
cial communications between the different nodes of the network.
52
TSS463B
DRAK
DRAK
Mess_Len = n+2
ID_Tag j (lsb)
ID_Tag i (lsb)
ID_Mask j (lsb)
ID_Mask i (lsb)
0x00
ID_Mask j (msb)
ID_Mask i (msb)
ID_Tag j (msb)
ID_Tag i (msb)
The linkage feature allows two channels to share the same Message area, the message
pointer and the message length assumes this property:
•
•
•
Only one level of linkage can be created. This means, (see Figure 36) a Channel k can
be linked to the Channel i but not to Channel j, already defined as linked to Channel i.
All the others can be different between the two channels, for example the ID_Tag.
The Channel j linked
Mess_Ptr
EXT RAK RNW RTR
EXT RAK RNW
i
Zero value as message length (M_L [4:0] - base_address + 0x03) declares the
channel linked to another channel.
The number of this other channel is defined in the message pointer field (M_P [6:0]
- base_address + 0x02).
The pointer and the length values for the Message area are defined only once, in
the register set of this other Channel.
CHER CHTx
CHER CHTx CHRx
to the Channel i
. . . .
CHRx
RTR
--- Message for Channels i & j ---
Message Status
DATA n
DATA 0
Channel i and j
share the same
Message area
4102E–AUTO–12/04