From XenonLibrary
Jump to navigation Jump to search
Titan II
Designed byIBM

The Titan is a development board used during bringup of the Shiva and Waternoose Engineering Sample CPUs. It also allows an IBM RISCWatch to be used to debug and test the processors.


  • Xilinx Spartan 3 XC3S200 FPGA
  • 128KB Xilinx XCF01S JTAG PROM
  • 4 DIP Switches
  • 9 3.3V LEDs (Later versions only)
  • 50MHz 3.3V Crystal


There are two versions, the Titan and the Titan II.

The Titan is powered off the console via the 3.3V V_MEMPORT and 1.8V V_1P8 rails. The 3.3V is also stepped down to 2.5V and 1.2V.

The 10-pin J_YETI header connects to J8C1, the CPU JTAG header, while the 12-pin J_GPUL header connects to J7G2, the Shiva GPUL JTAG header.

Different bitstreams are required for Shiva, and the various revisions of Waternoose.

The DIP switch operation is not currently known. The recommended configuration is OFF - OFF - ON - OFF.


The Titan II has 9 LEDs mounted near one end. Reverse engineering has been used to determine their meaning. Earlier Titan revisions do not have LEDs.

  • LED 0 through LED 4 are blue LEDs that indicate the status code between 0x00 and 0x1F. Bit 0 (LED 0) is MSB.
  • LED 5 is a red LED that indicates when the Titan times out when attempting to boot the CPU.
  • LED 6 is a green LED of unknown use.
  • LED 7 is a yellow LED of unknown use.
  • LED 8 is a red LED of unknown use.