Asynchronous Debug Port; Pci-Isa Bridge (Pib) Controller - Motorola MVME2300 Series Installation And Use Manual

Functional Description
3

Asynchronous Debug Port

PCI-ISA Bridge (PIB) Controller

3-16
Maximum performance is achieved with D64 Multiplexed Block
Transfers (MBLT). The on-chip DMA channel should be used to move
large blocks of data to/from the VMEbus. The Universe should be able to
reach 50MB/second in 64-bit MBLT mode.
The MVME2300 interfaces to the VMEbus via the P1 and P2 connectors,
which use the new 5-row 160-pin connectors as specified in the VME64
extension standard. It also draws +5V, +12V, and -12V power from the
VMEbus backplane through these two connectors. 3.3V and 2.5V supplies
are regulated onboard from the +5 power.
A PC16550 Universal Asynchronous Receiver/Transmitter (UART)
provides the asynchronous debug port. TTL-level signals for the port are
routed through appropriate EIA-232-D drivers and receivers to an RJ45
connector on the front panel. The external signals are ESD protected.
This serial port can support 19.2 KBaud I/O. For detailed programming
information, refer to the MVME2300 Series VME Processor Module
Programmer's Reference Guide and to the vendor documentation for the
UART device.
The MVME2300 uses a W83C553 PCI/ISA Bridge (PIB) Controller to
supply the interface between the PCI local bus and the ISA system I/O bus
as shown in Figure 3-1.
The PIB controller provides the following functions:
PCI bus arbitration for:
– ISA (Industry Standard Architecture) bus DMA (not functional
on MVME2300)
– The PHB (PCI Host Bridge) MPU/local bus interface function,
implemented by the Raven ASIC
– All on-board PCI devices
– The PMC slot
Computer Group Literature Center Web Site