Transtech Transputer, Руководство пользователя

Страница: 90 / 200

Network Configuration
82
Transputer Motherboard User Manual TMB M 711
application specific signals to be brought onto the motherboard, e.g.,
RS232 lines. The individual pins of P4 are rated at 50mA @ 25V with
respect to ground. Note that pin1 of P4 is at the top.
7.3 Network Configuration
This section provides an overview of network configuration on the
TMB12. It describes the electronic link switching, the pipeline and the
relation with the edge connectors.
7.3.1 Electronic Link Switching
This section describes the organization of the electronic link
switches.
The two C004s on the TMB12 allow complex transputer topologies
to be constructed. They are used in a slightly unusual way to allow
the maximum amount of re-connectivity on the TMB12 given the
constraints of the hard-wired pipeline.
In general, the link output signals from all the link0s on all the slots
(16 signals) are connected to 16 inputs of one of the C004s (IC2).
The link input signals from all the link3s on all the slots (16 signals)
are connected to 16 of the outputs of the same C004. The C004 can
therefore switch any link0 output to any link3 input.
Similarly, the other C004 is connected to the TRAM slot’s link0 inputs
and link3 outputs. This C004 can therefore switch any link3 output to
any link0 input.
This means that each half of a switched link connection between two
transputers is routed through a different C004. The result of this
wiring scheme is that any link0 of any transputer can be connected
to any link3 of any transputer. However, a link0 may not connect
directly to another link0.
In a similar fashion to the transputer links, there are 32 edge
connector links. Edge links are divided equally into two types:
• type 0: wired as per transputer link0’s, i.e., link output to IC2 and
link input from IC3
• type3: wired as per transputer link3’s, i.e., link output to IC3 and
link input from IC2.
Hence, the link switching that can be achieved is:
• any link0 to any link3,
• any link0 to any edge link of type3,