OCX160 Datasheet, PDF (17/44 Pages) List of Unclassifed Manufacturers – OCX160 Crosspoint Switch

OCX160 Crosspoint Switch—Preliminary Data Sheet
1.4.8 JTAG Instructions
I [3:0] BB BA B9 B8
0000 X X X X
0001 X X X X
0010 X X X X
0011 X X X X
0 1 0 0 X Clock Data OE
Select Mode
0101 X X X X
Table 8 JTAG Instructions
B7
A6-A0
Instruction
Description
X
X
Sample/EXTEST Places the device in scan mode.
X
X
Sample/EXTEST Places the device in scan mode.
X
X
Reset the Crosspoint Resets the entire Crosspoint Array to no-connect. All
Array
other Output Buffer configurations are unchanged by
this operation.
X
X
Set Array for
Use the JTAG Address Register as the Input address to
Broadcast mode be the broadcast input Connects the selected Input to
all Output cells and disconnects all other Inputs.
Activating the Global Update JTAG instruction returns
the Crosspoint array from the Broadcast mode to the
previous programed state.
OE Output Buffer Program a Buffer Programs the Output Buffer address specified in the
Address
JTAG instruction (A6-A0). The configuration data is
also specified in the JTAG instruction bits BA-B7. See
Table 9 for bit assignment of the Buffer functionality.
X Output Address/ Configuration
Buffer
readback
Readback the connectivity of the Crosspoint cell with
the Input location specified in the JTAG Address
Register and the Output location specified JTAG
instruction (A0-A6). It also returns the configuration of
the Output Buffer addressed in the JTAG instruction
(A0-A6).
The readback data is shifted out of TDO in the
following sequence:
1. Crosspoint Connect (1=connected, 0=no
connection)
2. Output Enable—B7 (see Table 9)
3. Output Enable—B8 (see Table 9)
4. Output Data Source—B9 (0=Flow-through,
1=registered)
5. Output Clock Select—BA (0=Global Clock,
1=Next Neighbor)
6. State of Broadcast bit
7. State of the RCE bit
0110 X X X X X
0111 X X X X X
NOTE: This instruction does not increment the JTAG
Address Register. This instruction also requires two
DR cycles
X
Update the
Update the programmed connection from the Loading
Crosspoint Array SRAM to the Active SRAM.
X
Disconnect Input Disconnect the Crosspoint connections from the Input
cell
address specified in the JTAG Address Register.
I-Cube, Inc.
[Rev. 1.6] 2/20/01
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