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The I/O port is the interface of the I/O subsystem to the TLSB bus. Two
modules can be used for I/O operations: KFTHA and KFTIA (integrated
I/O port). Figure 6-1 shows the I/O subsystem block diagram with a
KFTHA module.
NOTE: The term "I/O port" applies to both modules, KFTHA and KFTIA. A spe-
cific I/O module is referred to by its name.
Figure 6-1
I/O Subsystem Block Diagram
The integrated I/O port (KFTIA) provides a PCI interface on the device
side. An overview of the KFTIA module is given at the end of this chapter.
The system supports up to three I/O ports. The interface path between the
I/O port and an individual I/O bus adapter module is known as the hose. A
single hose consists of two unidirectional cables, physically bundled to-
gether, up to 10 feet in length. One half of the cable (Down Hose) trans-
mits data and control information from the I/O port to the I/O bus adapter
module. The other half of the cable (Up Hose) transmits data and control
information from the I/O bus adapter module to the I/O port. The hose
data path is 32 bits wide in each direction. Transfers across the hose are
full duplex.
TLSB I/O Port
Module
(KFTHA)
TLSB Bus
Hose 0
I/O Bus
Adapter
Hose 1
I/O Bus
Adapter
Hose 2
XMI or FBUS+
Adapter
Hose 3
XMI, FBUS+,
or PCI Adapter
Chapter 6
I/O Port
I/O Bus 0
I/O Bus 1
I/O Bus 2
I/O Bus 3
BXB0799.AI
I/O Port 6-1
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