IDT77V550 Datasheet, PDF (1/19 Pages) List of Unclassifed Manufacturers – SwitchStarTM Switch Manager

SwitchStar^TM
Switch Manager
IDT77V550
Features List
u _{Interprets switch command cells from external work station}
and loads the command into the IDT77V500 Switch
Controller
u _{Utilizes in-stream (in-band) signalling technique via the cell}
stream into the Switching Memory
u _{Can generate control cells to be sent back to the external}
workstation
u _{Executes three types of commands:}
– Writing data to Switch Controller
– Reading data from Switch Controller
– Reset operations
u _{Single +3.3V ± 0.3V power supply}
u _{Industrial Temperature (-40°C to 85°C) is available.}
Description
The IDT77V550 Switch Manager is a device developed to provide a
simple method of communication between an external workstation/
processor and the IDT77V500 Switch Controller. An In-Band signalling
technique is utilized to examine incoming ATM cells, determining if the
cell is a Command Cell for the Switch Controller, and loads the
command if appropriate. In the typical configuration (Figure 1), the
IDT77V550 is located on the IDT77V400 port to receive both signalling
cells and standard traffic cells. The Switch Manager does not have to be
connected to a Switching Memory port if it is only receiving the signalling
cells.
The Switch Manager has two cell streams which flow in opposite
directions, and can both interpret an incoming cell and generate control
cells as necessary. Figure 2 illustrates the basic block configuration of
the Switch Manager. The Data Path Interface (DPI) is used on both the
cell input and output ports of the IDT77V550. DPI is utilized on the
IDT77V400 to provide both reduced pin count per port and to offer
configuration flexibility.
The IDT77V550 is capable of executing four basic types of
commands in the system:
u _{Writing data to the Switch Controller}
u _{Reading data from the Switch Controller}
u _{Resetting the switch components}
u _{Reading Switch Manager version information}
When writing information to the Switch Controller, the IDT77V550 will
store information needed to execute the command (up to 32 bytes) in
internal memory and perform the command across the Switch Controller
Manager bus. Likewise, for a read operation the information is received
from the Switch Controller, stored internally by the IDT77V550, and then
Block Diagram
Line Cards
DPI Receive
Switching Memory
,
DPI Transmit
•
•
•
Switch Manager
DPI Receive
DPI Receive
IDT77V550
DPI Transmit
DPI Transmit
Control Bus
Switch Controller
4523 drw 01
Figure 1 IDT77V550 Application with IDT77V400 Switching Memory and IDT77V500 Switch Controller
© 2000 Integrated Device Technology, Inc.
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June 22, 2001
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