Expansion Bus Interface Specification
CPU board and Expansion board are connected with 140-pin expansion bus connector. The signal in expansion bus is connected by the signals of CPU bus (data bus, address bus, and various control signals) via bus buffer.
133-136 pins shall be VBAT (voltage range: 5.0V±5% input), and 137-140 pins shall be GND as the common specification of T-Engine. Other bus signal pins shall be voluntarily allocated to each CPU.
Recommended connector:
- Model: KYOCERA ELCO 20-5603-14-XXXX-861+ (XXXX: T-Engine expansion bus category code)
- The above XXXX is 4-digit number called a “keying no.” and represents a classification code of error insertion prevention key to T-Engine extension bus connector.
Keying allocation of the extension bus connector shall be in accordance with the following operational procedure:
- Allocated keying will be released on the members-only page of the T-Engine forum website (http://www.t-engine.org/).
- Manufacturers, which develop new board, shall refer to this information, and shall use the existing keying if it is available.
- Approval by the T-Engine Forum is required for the new keying allocation. At this point, the new keying allocation may be disapproved if bus specification is determined to be compatible with existing keying.
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