CI750 CMI to CI Dual Path Interface consisting of the CI Port
Adapter(CIPA) in a CI750 Adapter Box, mounted in a "lowboy"
H9542 cabinet and the CPU Memory Interconnect (CMI) mounted
in the VAX 11/750 backplane
CMI Bandwidth 70 Mbytes/s (for HW transfers)
CI data transfer 70 Mbits/s (maximum)
rate
Supported host VAX 11/750
systems
Supported CI HSC50 controller
storage
controllers
Supported CI CI750, CI780, CIBCA-B, CIBCI, CIPCA, CIXCD
host adapters
Supported Star SC008
Couplers
Minimum OpenVMS Version V3.5
Operating System
The CI750 is a microprocessor controlled, fully buffered, high speed,
intellegent interface used to transfer I/O data between two or more computer
nodes. Data is tranferred via dual path CI serial data busses and associated
SC008 Star Couplers, over BNCIA-xx type CI cables of no more than 45 meters
in length. Computer nodes connected in this manner are referred to as a
CLUSTER. The CI750 consists of two basic sections; the *CI Port
Adapter*(CIPA) in a CI750 Adapter Box, mounted in a "lowboy" H9542 cabinet,
which contains a 877-D(B) power controller, and the *CPU Memory
Interconnect* (CMI). The CIPA is further broken down into three modules;
LINK (ILI, L0100), PACKET BUFFER (IPB, L0101) and DATA PATHS (CDP, L0400),
one H7202-D Power Supply and a forced air cooling fan. The CMI consists of a
single CMI INTERFACE (CCI, L0009) module which resides in one of the 3 CMI
I/O option slots in the VAX 11/750 backplane. The CIPA and CMI are connected
via the CIPA 40 conductor bus cables (17-19602-00) which can be no longer
that 15 ft.
Features
========
Dual signal paths capable of simultanious operation
70 megabit-per second bandwidth and transfer rate
32 bit CRC generation and checking
Low error rate
Packet-oriented data transfers
Immediate acknowledgement of packet recept
Contention arbitration at light loading conditions
Round -robin arbitration at heavy loading conditions
Internal and external data looping for diagnostic purposes
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| 17-19602-00
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