TSS901E
Operation Modes
According to the different protocol formats expected for the operation of the TSS901E,
two major operation modes are implemented into the TSS901E. The operation modes
are chosen individually for each link channel by setting the respective configuration reg-
isters via the HOCI or via the link.
•
Transparent Mode (default after reset):
This mode allows complete transparent
data transfer between two nodes without performing any interpretation of the
databytes and without generating any acknowledges. It is completely up to the host
CPU to interpret the received data and to generate acknowledges if required.
The TSS901E accepts EOP1 and EOP2 control tokens as packet delimiters and
generates autonomously EOP1/EOP2 (as configured) markers after each end of a
transmission packet.
This mode also includes as a special submode:
–
•
Wormhole routing:
This mode allows hardware routing of packets by the
TSS901E.
Simple Interprocessor Communication (SIC) Protocol Mode: This mode executes
the simple interprocessor communication protocol as described in the protocol
specification
(1)
. The following capabilities of the protocol are implemented into the
TSS901E:
–
–
–
interpretation of the first 4 data tokens as the header bytes of the protocol
autonomous execution of the simple control commands as described in the
protocol specification
(1)
autonomous acknowledgement of received packets if configured
In transmit direction no interpretation of the data is performed. This means that for
transmit packets, the four header bytes must be generated by the host CPU and
must be available as the first data read from the communication memory.
EOP1/EOP2 control tokens are automatically inserted by the TSS901E when one
configured transfer from the communication memory has finished.
1.
Rastetter P. et.al., Simple Interprocessor Communication Protocol Specification, DIP-
SAPII-DAS-31-01, Issue 3, 08.10.96, also available on the same web site as the users
guide.
4
Rev. C – 24-Aug-01
ATMEL [ ATMEL CORPORATION ]
