VAXBI to CI Port Adapter (Dual Path)
CIBCI VAXBI to CI Dual Path Interface comes in 2 separate sections;
the VAXBI section and the CI section. The VAXBI section
consists of two Eurocard, T series modules, the Adapter
control module (BAC, T1017) and the Adapter data module (BAD,
T1018). The CI section consists of three extended hex L series
modules, the Link interface module (ILI, L0100), the Packet
buffer module (IPB, L0101) and the Data path module (CDP,
L0400) mounted in a CIPA Adapter Box, which is in turn mounted
in a H9642 CIPA cabinet (for VAX82xx/83xx) or H9652 expander
cabinet (for VAX 85xx, 87xx or 88xx).
Priority
arbitration
Contention (light loading)
Round-robin (heavy loading)
Parity Cyclic redundancy checking (CRC)
Data format Manchester encoded serial packet
VAXBI Characteristics
Bus type Synchronous
Width 32 data bits
Cycle time 200 ns
Data
transfers
Block mode (masked)
Longword
Quadword
Octaword
Priority Distributed embedded
arbitration
Parity Odd
Master port 11.4 Mbytes/sec
bandwidth
Slave port 13.3 Mbytes/sec
bandwidth
Maximum 5 ft/1.5m
transmission
length
Maximum bus 16 logical nodes
loading
CIPA bus Specifications
Bus type Synchronous
Width 16 data bits
Cycle time 400 ns
Data parity Odd
Data Packet
transfers
Bandwidth 2M to 3Mbytes/sec
Maximum 15 ft/4.5 m
length
Bus loading 2
Impedance 120 Ohms
CI Characteristics
Bus type Synchronous
Width Serial
Maximum 147.64 ft/45 m radius from the star coupler
external
length
Data transfer 70 Mbits/sec
rate
Maximum bus 16 logical nodes
loading
Cable type Double shielded coaxial
(BNCIA-XX)
Cable 50 ohms
impedance
The CIBCI is a VAXBI to CI Dual Path Interface and provides buffered
parallel to serial communications between two CI bus architecture protocols;
the VAX backplane interconnect (VAXBI) bus of the VAX 8000 series host
processor and the dual path computer interconnect (CI) bus. The CIBCI uses
queue structures in OpenVMS VAX to transfer packet messages and blocks of
data between the VAX 8000 memory and/or other nodes in the VAXcluster. It
comes in two separate sections; the VAXBI section and the CI section. The
VAXBI section consists of two Eurocard, T-series modules, the Adapter
control module (BAC, T1017) and the Adapter data module (BAD, T1018). The CI
section consists of three extended hex L series modules, the Link interface
module (ILI, L0100), the Packet buffer module (IPB, L0101) and the Data path
module (CDP, L0400) mounted in a CIPA Adapter Box, which is in turn mounted
in a H9642 CIPA cabinet (for VAX82xx/83xx) or H9652 expander cabinet (for
VAX 85xx, 87xx or 88xx).
Features
========
VAX backplane interconnect design
2Mbytes/sec performance at 40K packet transmission rate
3Mbytes/sec performance at 90K packet transmission rate
Dual signal paths
70 Mbit/sec bandwidth and transfer rate
32 bit cyclic redundancy checking (CRC) and checking
Low error rate
Packet-oriented data transmission
Immediate acknowledgment of packet reception
Round -robin arbitration at heavy loading
Contention arbitration at light loading
Diagnostic loopback capability (both internal and external)
Operational modes
Disabled
Enabled
Uninitialized
Disabled/maintenance
Enabled/maintenance
Uninitialized/maintenance
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