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SDI bus Description

The Serial Debug Interface [SDI] is a Motorola interface [freescale semiconductor] that a debugger [PC] uses to communicate with an external system. The SDI data format is 8 data bits, 1 stop bit, no parity, and a variable baud rate. The default speed is 9600 baud. Communication speeds of 1200 through 57600 baud are available, depending on the host-computer hardware. The SDI uses a 25-pin D-Sub connector as an interface to a PC's serial port and either a 8 or 10-pin Background Debug Mode [BDM] connector to interface to the hardware [board].

freescale semiconductor {Generated the SDI Interface in 1996, still in wide spread use.}

Serial Debug Interface Signal Assignments

Pin 1 DS, DATA STROBE – Active-low output signal. During a read cycle, indicates that an external device should place valid data on the data bus. During a write cycle, indicates that valid data is on the data bus.
Pin 2 BERR, BUS ERROR – Active-low input signal of an invalid bus operation attempt.
Pin 3, 5 GND, GROUND
Pin 4 BKPT / DSCLK BREAKPOINT – Active-low input signal that signals a hardware breakpoint to the CPU. Development Serial Clock – Clock input signal for the background debug mode.
Pin 6 FREEZE – Active high signal that the CPU has acknowledged a breakpoint.
Pin 7 RESET – Active-low, bi-directional signal to start a system reset.
Pin 8 DSI DEVELOPMENT SERIAL IN – Serial data input signal for background debug mode. Signal is also: INSTRUCTION PIPE 1 for CPU16-based MCUs. INSTRUCTION FETCH for CPU32-based MCUs.
Pin 9 VDD (or Vbias) VOLTAGE DRAIN – DRAIN – Interface operating power (not used for low-voltage or separate-power hookups).
Pin 10 DSO DEVELOPMENT SERIAL OUT – Serial data output signal for background debug mode. Signal is also: INSTRUCTION PIPE 0 for CPU16-based MCUs. INSTRUCTION PIPE for CPU32-based MCUs

More Integrated Circuit Buses descriptions.

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