Serial Vector Format

• Stimulus data: This is data to be sent to a device or electronic circuit
• Expected response: This is the data the device or circuit is expected to send back if there is no error
• Mask data: Defines which bits in the expected response are valid; other bits of the device's response are unknown and must be ignored when comparing the expected response and the data returned from the circuit
• Additional information on how to send the data

SVF commands

• ENDDR: Specifies default end state for DR scan operations.
• ENDIR: Specifies default end state for IR scan operations.
• FREQUENCY: Specifies maximum test clock frequency for IEEE 1149.1 bus operations.
• HDR: Specifies a header pattern that is prepended to the beginning of subsequent DR scan operations.
• HIR: Specifies a header pattern that is prepended to the beginning of subsequent IR scan operations.
• PIO: Specifies a parallel test pattern.
• PIOMAP: Maps PIO column positions to a logical pin.
• RUNTEST: Forces the IEEE 1149.1 bus to a run state for a specified number of clocks or a specified time period.
• SDR: Performs an IEEE 1149.1 Data Register scan.
• SIR: Performs an IEEE 1149.1 Instruction Register scan.
• STATE: Forces the IEEE 1149.1 bus to a specified stable state.
• TDR: Specifies a trailer pattern that is appended to the end of subsequent DR scan operations.
• TIR: Specifies a trailer pattern that is appended to the end of subsequent IR scan operations.
• TRST: Controls the optional Test Reset line.