OCX160 Datasheet, PDF (14/44 Pages) List of Unclassifed Manufacturers – OCX160 Crosspoint Switch

OCX160 Crosspoint Switch—Preliminary Data Sheet
1.4 JTAG Configuration Controller
The Output port attributes and the Switch Matrix connections can be programmed using the JTAG serial
bus. The RapidConfigure Interface can be enabled or disabled using the JTAG serial bus.
The JTAG–based serial mode is always available for configuration regardless of whether the
RapidConfigure mode is enabled or disabled. However, proper care must be taken when switching between
JTAG and RapidConfigure for configuring the devices. Before attempting to change Switch Matrix
connections or output port configuration through JTAG, the user must first ensure that the RapidConfigure
mode is disabled by using JTAG serial mode to set the RCE bit to zero in the Mode Control Register.
1.4.1
JTAG Interface
The dedicated JTAG TAP interface is designed in compliance with the IEEE-1149.1. The standard
interface has five pins: Test Data Out (TDO), Test Mode Select (TMS), Test Data In (TDI), Test
Reset (TRST#), and Test Clock (TCK), which allow Boundary Scan Testing as well as device
configuration and verification. The I-Cube supplied software will automatically generate the
necessary bitstream from a higher-level textual description of the required configuration. Data on
the TDI and TMS pins are clocked into the device on the rising edge of the TCK signal, while the
valid data appears on the TDO pin after the falling edge of TCK. For more detailed information
on JTAG programming, refer to the OCX160 Register Programming Manual.
1.4.2
Output Port Configuration
Output port configuration is accomplished by loading the appropriate bitstream into the
programming registers present at each Output port. The JTAG serial bus is used to load
configuration data into the Output port programming registers, one Output port at a time.
1.4.3
Switch Matrix Configuration
The contents of the SRAM cells controlling Switch Matrix connection can be modified using the
JTAG. This is accomplished by loading the configuration data, one word at a time, into the SRAM
cells in the Switch Matrix.
1.4.4
Mode Control Register Configuration
The OCX160 contains a single bit Mode Control Register used to store user flags for
RapidConfigure Enable (RCE). These are required for proper functioning of the device. The
contents of this register can be changed using the JTAG interface and a special JTAG instruction.
Table 6 Mode Control Register
RCE
0
1
Mode
RapidConfigure interface disabled (OFF)
RapidConfigure interface enabled (ON)
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[Rev. 1.6] 2/20/01
I-Cube, Inc.