AT697E_09 Datasheet, PDF (11/154 Pages) ATMEL Corporation – Rad-Hard 32 bit SPARC V8 Processor

DSU Signals
JTAG
PCI Arbiter
4226G–AERO–05/09
AT697
This active high output is asserted when the PLL output (internal node) is locked at the
frequency corresponding to four times the input command.
LFT - PLL passive low pass filter (input)
This input is used to connect the PLL passive low pass filter.
DSUACT - DSU active (output)
This active high output is asserted when the processor is in debug mode and controlled
by the DSU.
DSUBRE - DSU break enable (input)
A low-to-high transition on this active high input will generate break condition and put
the processor in debug mode.
DSUEN - DSU enable (input)
The active high input enables the DSU unit. If de-asserted, the DSU trace buffer will
continue to operate but the processor will not enter debug mode.
DSURX - DSU receiver (input)
This active high input provides the data to the DSU communication link receiver
DSUTX - DSU transmitter (output)
This active high input provides the output from the DSU communication link transmitter.
TCK - Test Clock (input)
Used to clock serial data into boundary scan latches and control sequence of the test
state machine. TCK can be asynchronous with CLK.
TMS - Test Mode select (input)
Primary control signal for the state machine. Synchronous with TCK. A sequence of val-
ues on TMS adjusts the current state of the TAP.
TDI - Test data input (input)
Serial input data to the boundary scan latches. Synchronous with TCK
TDO - Test data output (output)
Serial output data from the boundary scan latches. Synchronous with TCK
TRST - Test Reset (input)
Resets the test state machine. Can be asynchronous with TCK. Shall be grounded for
end application.
AREQ*[3:0] - PCI bus request (Input)
When asserted, these active low inputs indicate that a PCI agent is requesting the bus.
AGNT*[3:0] - PCI bus grant (Output)
When asserted, these active low outputs indicate that a PCI agent is granted the PCI
bus.
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