Testplan

Testpoints

Stage V1 Testpoints

smoke

Test: adc_ctrl_smoke

Verify datapath between AST ADC interface and ADC sample registers.

Stimulus:

For a number of iterations:

  • Configure DUT no filters or events.
  • Generate ADC data.
  • Sample into capture registers using oneshot mode.

Checks:

  • From monitored ADC data predict the value of the ADC sample register
  • Compare sample registers against expected.
  • Check oneshot bit of interrupt status register works as expected.

csr_hw_reset

Test: adc_ctrl_csr_hw_reset

Verify the reset values as indicated in the RAL specification.

  • Write all CSRs with a random value.
  • Apply reset to the DUT as well as the RAL model.
  • Read each CSR and compare it against the reset value. it is mandatory to replicate this test for each reset that affects all or a subset of the CSRs.
  • It is mandatory to run this test for all available interfaces the CSRs are accessible from.
  • Shuffle the list of CSRs first to remove the effect of ordering.

csr_rw

Test: adc_ctrl_csr_rw

Verify accessibility of CSRs as indicated in the RAL specification.

  • Loop through each CSR to write it with a random value.
  • Read the CSR back and check for correctness while adhering to its access policies.
  • It is mandatory to run this test for all available interfaces the CSRs are accessible from.
  • Shuffle the list of CSRs first to remove the effect of ordering.

csr_bit_bash

Test: adc_ctrl_csr_bit_bash

Verify no aliasing within individual bits of a CSR.

  • Walk a 1 through each CSR by flipping 1 bit at a time.
  • Read the CSR back and check for correctness while adhering to its access policies.
  • This verify that writing a specific bit within the CSR did not affect any of the other bits.
  • It is mandatory to run this test for all available interfaces the CSRs are accessible from.
  • Shuffle the list of CSRs first to remove the effect of ordering.

csr_aliasing

Test: adc_ctrl_csr_aliasing

Verify no aliasing within the CSR address space.

  • Loop through each CSR to write it with a random value
  • Shuffle and read ALL CSRs back.
  • All CSRs except for the one that was written in this iteration should read back the previous value.
  • The CSR that was written in this iteration is checked for correctness while adhering to its access policies.
  • It is mandatory to run this test for all available interfaces the CSRs are accessible from.
  • Shuffle the list of CSRs first to remove the effect of ordering.

csr_mem_rw_with_rand_reset

Test: adc_ctrl_csr_mem_rw_with_rand_reset

Verify random reset during CSR/memory access.

  • Run csr_rw sequence to randomly access CSRs
  • If memory exists, run mem_partial_access in parallel with csr_rw
  • Randomly issue reset and then use hw_reset sequence to check all CSRs are reset to default value
  • It is mandatory to run this test for all available interfaces the CSRs are accessible from.

regwen_csr_and_corresponding_lockable_csr

Tests:

  • adc_ctrl_csr_rw
  • adc_ctrl_csr_aliasing

Verify regwen CSR and its corresponding lockable CSRs.

  • Randomly access all CSRs
  • Test when regwen CSR is set, its corresponding lockable CSRs become read-only registers

Note:

  • If regwen CSR is HW read-only, this feature can be fully tested by common CSR tests - csr_rw and csr_aliasing.
  • If regwen CSR is HW updated, a separate test should be created to test it.

This is only applicable if the block contains regwen and locakable CSRs.

Stage V2 Testpoints

filters_polled

Test: adc_ctrl_filters_polled

Verify filter functionality by polling filter status register.

Stimulus:

For a number of iterations:

  • Configure DUT with randomized filter parameters, filters enabled but no interrupts or wake events.
  • Generate ADC data stream.

Checks:

  • From monitored ADC data predict when filters should be triggered.
  • Confirm this by reading the filter status register.
  • Ensure that only one ADC channel is selected at a time.

filters_polled_fixed

Test: adc_ctrl_filters_polled_fixed

As filters_polled but with filter parameters fixed during the test.

filters_interrupt

Test: adc_ctrl_filters_interrupt

Verify filter interrupt functionality.

Stimulus:

For a number of iterations:

  • Configure DUT with randomized filter parameters, filters and interrupts enabled.
  • Generate ADC data stream.

Checks:

  • From monitored ADC data predict when filters should be triggered.
  • Confirm this by reading the filter status register and interrupt status register.
  • Confirm correct interrupt sample value has been captured in ADC sample registers(s)
  • Check interrupt signal operates as expected.

filters_interrupt_fixed

Test: adc_ctrl_filters_interrupt_fixed

As filters_interrupt but with filter parameters fixed during the test.

filters_wakeup

Test: adc_ctrl_filters_wakeup

Verify filter wakeup functionality

Stimulus: For a number of iterations:

  • Configure DUT with randomized filter parameters, filters and wakeup enabled, low power sampling mode.
  • Generate ADC data stream.

Checks:

  • From monitored ADC data predict when filters should be triggered.
  • Confirm this by reading the filter status register.
  • Check wakeup signal operates as expected.

filters_wakeup_fixed

Test: adc_ctrl_filters_wakeup_fixed

As filters_wakeup but with filter parameters fixed during the test.

filters_both

Test: adc_ctrl_filters_both

Verify filter wakeup and interrupt function correctly together

Stimulus:

For a number of iterations:

  • Configure DUT with randomized filter parameters, filters, interrupt and wakeup enabled, randomized low/high power sampling mode.
  • Generate ADC data stream.

Checks:

  • From monitored ADC data predict when filters should be triggered.
  • Confirm this by reading the filter status register and interrupt status register.
  • Check wakeup signal operates as expected.
  • Check interrupt signal operates as expected.

clock_gating

Test: adc_ctrl_clock_gating

Verify filter wakeup and interrupts function correctly when fast clock is turned off as would occur in the system.

Stimulus:

For a number of iterations:

  • Configure DUT with randomized filter parameters, filters, interrupt and wakeup enabled, low power sampling mode.
  • Turn off fast clock.
  • Generate ADC data stream.
  • When wakeup occurs after a further random period turn fast clock back on.

Checks:

  • From monitored ADC data predict when filters should be triggered.
  • Confirm this by reading the filter status register and interrupt status register.
  • Check wakeup signal operates as expected.
  • Check interrupt signal operates as expected.

poweron_counter

Test: adc_ctrl_poweron_counter

Verify ADC power on counter

Stimulus:

For a number of iterations:

  • Configure DUT with a random ADC power on count.
  • Enable ADC.
  • Generate ADC data stream.

Checks:

  • Confirm timing of power down and channel select signals to ADC.

lowpower_counter

Test: adc_ctrl_lowpower_counter

Verify ADC low power counter

Stimulus:

For a number of iterations:

  • Configure DUT with a random low power sample count.
  • Enable ADC in low power mode.
  • Generate ADC data stream.

Checks:

  • Confirm return to fast sampling happens as expected.

fsm_reset

Test: adc_ctrl_fsm_reset

Verify ADC controller FSM software reset

Stimulus:

For a number of iterations:

  • Configure DUT with a random low power sample count.
  • Enable ADC randomly in low or high power mode.
  • Generate ADC data stream.
  • Trigger a software reset by writing to adc_fsm_rst register.

Checks:

  • Ensure ADC controller FSM and counters are reset.

stress_all

Test: adc_ctrl_stress_all

Combine above sequences in one test then randomly select for running

Stimulus:

  • Start sequences and randomly add reset between each sequence

Checking:

  • All sequences should be finished and checked by the scoreboard

alert_test

Test: adc_ctrl_alert_test

Verify common alert_test CSR that allows SW to mock-inject alert requests.

  • Enable a random set of alert requests by writing random value to alert_test CSR.
  • Check each alert_tx.alert_p pin to verify that only the requested alerts are triggered.
  • During alert_handshakes, write alert_test CSR again to verify that: If alert_test writes to current ongoing alert handshake, the alert_test request will be ignored. If alert_test writes to current idle alert handshake, a new alert_handshake should be triggered.
  • Wait for the alert handshakes to finish and verify alert_tx.alert_p pins all sets back to 0.
  • Repeat the above steps a bunch of times.

intr_test

Test: adc_ctrl_intr_test

Verify common intr_test CSRs that allows SW to mock-inject interrupts.

  • Enable a random set of interrupts by writing random value(s) to intr_enable CSR(s).
  • Randomly “turn on” interrupts by writing random value(s) to intr_test CSR(s).
  • Read all intr_state CSR(s) back to verify that it reflects the same value as what was written to the corresponding intr_test CSR.
  • Check the cfg.intr_vif pins to verify that only the interrupts that were enabled and turned on are set.
  • Clear a random set of interrupts by writing a randomly value to intr_state CSR(s).
  • Repeat the above steps a bunch of times.

tl_d_oob_addr_access

Test: adc_ctrl_tl_errors

Access out of bounds address and verify correctness of response / behavior

tl_d_illegal_access

Test: adc_ctrl_tl_errors

Drive unsupported requests via TL interface and verify correctness of response / behavior. Below error cases are tested bases on the TLUL spec

  • TL-UL protocol error cases
    • invalid opcode
    • some mask bits not set when opcode is PutFullData
    • mask does not match the transfer size, e.g. a_address = 0x00, a_size = 0, a_mask = 'b0010
    • mask and address misaligned, e.g. a_address = 0x01, a_mask = 'b0001
    • address and size aren’t aligned, e.g. a_address = 0x01, a_size != 0
    • size is greater than 2
  • OpenTitan defined error cases
    • access unmapped address, expect d_error = 1 when devmode_i == 1
    • write a CSR with unaligned address, e.g. a_address[1:0] != 0
    • write a CSR less than its width, e.g. when CSR is 2 bytes wide, only write 1 byte
    • write a memory with a_mask != '1 when it doesn’t support partial accesses
    • read a WO (write-only) memory
    • write a RO (read-only) memory
    • write with instr_type = True

tl_d_outstanding_access

Tests:

  • adc_ctrl_csr_hw_reset
  • adc_ctrl_csr_rw
  • adc_ctrl_csr_aliasing
  • adc_ctrl_same_csr_outstanding

Drive back-to-back requests without waiting for response to ensure there is one transaction outstanding within the TL device. Also, verify one outstanding when back- to-back accesses are made to the same address.

tl_d_partial_access

Tests:

  • adc_ctrl_csr_hw_reset
  • adc_ctrl_csr_rw
  • adc_ctrl_csr_aliasing
  • adc_ctrl_same_csr_outstanding

Access CSR with one or more bytes of data. For read, expect to return all word value of the CSR. For write, enabling bytes should cover all CSR valid fields.

Stage V2S Testpoints

tl_intg_err

Tests:

  • adc_ctrl_tl_intg_err
  • adc_ctrl_sec_cm

Verify that the data integrity check violation generates an alert.

  • Randomly inject errors on the control, data, or the ECC bits during CSR accesses. Verify that triggers the correct fatal alert.
  • Inject a fault at the onehot check in u_reg.u_prim_reg_we_check and verify the corresponding fatal alert occurs

sec_cm_bus_integrity

Test: adc_ctrl_tl_intg_err

Verify the countermeasure(s) BUS.INTEGRITY.

Stage V3 Testpoints

stress_all_with_rand_reset

Test: adc_ctrl_stress_all_with_rand_reset

This test runs 3 parallel threads - stress_all, tl_errors and random reset. After reset is asserted, the test will read and check all valid CSR registers.

Covergroups

adc_ctrl_filter_cg

Cover filter configuration (one instance per filter)

adc_ctrl_fsm_reset_cg

Cover FSM state and counter values when fsm_reset is triggered

adc_ctrl_hw_reset_cg

Cover FSM state and counter values when hardware reset is asserted

adc_ctrl_testmode_cg

Cover all operation modes of adc controller

regwen_val_when_new_value_written_cg

Cover each lockable reg field with these 2 cases:

  • When regwen = 1, a different value is written to the lockable CSR field, and a read occurs after that.
  • When regwen = 0, a different value is written to the lockable CSR field, and a read occurs after that.

This is only applicable if the block contains regwen and locakable CSRs.

tl_errors_cg

Cover the following error cases on TL-UL bus:

  • TL-UL protocol error cases.
  • OpenTitan defined error cases, refer to testpoint tl_d_illegal_access.

tl_intg_err_cg

Cover all kinds of integrity errors (command, data or both) and cover number of error bits on each integrity check.

Cover the kinds of integrity errors with byte enabled write on memory if applicable: Some memories store the integrity values. When there is a subword write, design re-calculate the integrity with full word data and update integrity in the memory. This coverage ensures that memory byte write has been issued and the related design logic has been verfied.