ocx256 ETC-unknow, ocx256 Datasheet - Page 19

• Manufacturer Part Number: ocx256
• Description: Ocx256 Crosspoint Switch
• Manufacturer: ETC-unknow

Fairchild Semiconductor
1.5 ImpliedDisconnect
ImpliedDisconnect is a feature that provides the ability to make fast switch connection changes.
When using the instruction “Connect, without ImpliedDisconnect” all other connections to the
specified output are set to “no connect”. However, the specified input remains connected to any
output that it was connected to before.
When using the instruction “Connect, with ImpliedDisconnect” all connections from the specified
input and to the specified output are set to “no connect”.
Thus, a connection change, i.e. breaking an existing connection and then making a new one, can
be accomplished in one RapidConfigure cycle.
JTAG Reset Sequence (TMS = “11111”)
Enable or Disable RapidConfigure
Change attributes of ONE Output Port
Change attributes of ALL Output Ports
Reset JTAG Controller + Reset ALL Output Ports + Clear ALL SRAM cells
Connect or disconnect two Ports
Configure Entire Switch Matrix
Completely Configure the Device (All Output Ports and All Switch Matrix Connections)
BA, B9, B8, B7
B8, B7
BA
B9
0,0
0,1
1,0
1,1
Table 10
Table 9
Clock Select:
0 = Global Clock
1 = Next Neighbor
Output Mode:
0 = Flow-through (OP)
1 = Registered (RO)
Output Enable:
Output enabled (ON) – this is the default state at reset
Output disabled (OFF)
Output controlled by OE (active high)
Output controlled by OE# (active low)
OCX256 Crosspoint Switch—Advanced Datasheet
Number of JTAG Cycles and Configuration Time
[Rev. 2.0] 3/21/02
Programming an Output using JTAG
Operation
Signal/Function
OCX256
462,336
456,920
Cycles
JTAG
3,584
28
28
35
56
7
19