The AXI_ADC_TRIGGER IP implements triggering for the ADC path and also controls two I/O triggering pins.
More about the generic framework interfacing ADCs can be read here: axi_adc_ip.
Interface | Pin | Type | Description |
---|---|---|---|
Clock | |||
clk | input | Clock input | |
Digital Trigger Pins | |||
trigger_i | input[1:0] | Trigger input | |
trigger_o | output[1:0] | Trigger output | |
trigger_t | output[1:0] | Trigger T signal, controlling if pin is input or output | |
Analog Data Inputs | |||
data_a | input[15:0] | Analog data for channel A | |
data_b | input[15:0] | Analog data for channel B | |
data_valid_a | input | Data valid signal for channel A | |
data_valid_b | input | Data valid signal for channel B | |
Analog Data Outputs | |||
data_a_trig | output[15:0] | Data with trigger embedded as most significant bit, channel A | |
data_b_trig | output[15:0] | Data with trigger embedded as most significant bit, channel B | |
data_valid_a_trig | output | Data valid for channel A | |
data_valid_b_trig | output | Data valid for channel B | |
trigger_out | output | trigger out of the adc_trigger delayed by 4 clock cycles plus the trigger delay mechanism used with the variable fifo for history(data before trigger) | |
trigger_out_la | output | trigger out of the adc_trigger delayed by 2 clock cycles minimum possible delay for instrument trigger | |
Fifo Depth | |||
fifo_depth | output[31:0] | Controls the dynamic depth of the history FIFO | |
AXI_S_MM interface | |||
s_axi_* | Standard AXI Slave Memory Map interface |
The AXI_ADC_TRIGGER IP implements triggering for the ADC path. The trigger is generated based on two external trigger pins, a triggering signal from the logic analyzer and the ADC channels.
The external trigger pins are controlled by the core and can be both input or output. For external triggering, they must be set to inputs(independently).
The analog triggering is based on comparison with a limit. The data format must be 2's complement and the maximum number of bits of the analog channel is 15. The trigger can be transmitted independent or embedded in the output word, at bit 15. When embedded, the triggers must be extracted and data must be reconstructed, before forwarding the data to the DMA. The UTIL_EXTRACT IP can be used for this purpose. Embedding the trigger in the data allows for additional IPs with unknown pipeline length to be introduced in the path.
If a history for data before the trigger is needed, a variable FIFO IP should be used. The FIFO depth is controlled using the trigger_offset bus of this IP.
Address | Bits | Name | Type | Default | Description | |
DWORD | BYTE | |||||
0x0000 | 0x0000 | REG_VERSION | Version Register | |||
---|---|---|---|---|---|---|
[31:0] | VERSION | RO | 0x00 | Version number | ||
0x0001 | 0x0004 | REG_SCRATCH | Scratch Register | |||
[31:0] | SCRATCH | RW | 0x00 | Scratch register | ||
0x0002 | 0x0008 | REG_TRIGGER_O | Control TRIGGER_O Value | |||
[1] | TRIGGER_O[1] | RW | 0x00 | Set TRIGGER_O[1] value | ||
[0] | TRIGGER_O[0] | RW | 0x00 | Set TRIGGER_O[0] value | ||
0x0003 | 0x000c | REG_IO_SELECTION | Control Trigger Pins Direction | |||
[7:5] | TRIGGER_O[1] (To PIN) | RW | 0x00 | Select output trigger pin 1 0: SOFTWARE TRIGGER - TRRIGER_O[1](0x0004) 1: TRIGGER_I[1] (PIN) 2: TRIGGER_I[0] (PIN) 3: TRIGGER_OUT (axi_adc_trigger) 4: TRIGGER_IN (Logic analyzer) |
||
[4:2] | TRIGGER_O[0] (Ti PIN) | RW | 0x00 | Select output trigger pin 0 0: SOFTWARE TRIGGER - TRRIGER_O[0](0x0004) 1: TRIGGER_I[0] (PIN) 2: TRIGGER_I[1] (PIN) 3: TRIGGER_OUT (axi_adc_trigger) 4: TRIGGER_IN (Logic analyzer) |
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[1] | IO_SELECTION[1] | RW | 0x00 | Drives the TRIGGER_T[1](To) pin | ||
[0] | IO_SELECTION[0] | RW | 0x00 | Drives the TRIGGER_T[0](Ti) pin | ||
0x0004 | 0x0010 | REG_CONFIG_TRIGGER_I | Configure Digital Triggering | |||
[9:8] | FALL_EDGE | RW | 0x00 | Enable falling edge triggering for TRIGGER[0] or TRIGGER[1] pin | ||
[7:6] | RISE_EDGE | RW | 0x00 | Enable rising edge triggering for TRIGGER[0] or TRIGGER[1] pin | ||
[5:4] | ANY_EDGE | RW | 0x00 | Enable any edge triggering for TRIGGER[0] or TRIGGER[1] pin | ||
[3:2] | HIGH_LEVEL | RW | 0x00 | Enable high level triggering for TRIGGER[0] or TRIGGER[1] pin | ||
[1:0] | LOW_LEVEL | RW | 0x00 | Enable low level triggering for TRIGGER[0] or TRIGGER[1] pin | ||
0x0005 | 0x0014 | REG_LIMIT_A | Analog Trigger Level for Channel | |||
[15:0] | LIMIT_A[15:0] | RW | 0x00 | Analog trigger level for channel A. 2's complement | ||
0x0006 | 0x0018 | REG_FUNCTION_A | Analog Triggering Function | |||
[1:0] | TRIGGER_FUNCTION_A | RW | 0x00 | Analog triggering function for channel A: 0: Lower than limit 1: higher than limit 2: pass through high limit 3: passthrough low limit |
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0x0007 | 0x001c | REG_HYSTERESIS_A | Analog Trigger Hysteresis for Channel | |||
[31:0] | HYSTERESIS_A | RW | 0x00 | Used for the passthrough functions | ||
0x0008 | 0x0020 | REG_TRIGGER_MUX_A | Trigger Selection for Path | |||
[3:0] | TRIGGER_MUX_A | RW | 0x00 | Selects trigger a mode: 0: Always on 1: Digital triggering, based on trigger[0] 2: ADC triggering, based on channel A 3: Reserved 4: Digital triggering OR ADC triggering 5: Digital triggering AND ADC triggering 6: Digital triggering XOR ADC triggering 7: Option 4 negated 8: Option 5 negated 9: Option 6 negated |
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0x0009 | 0x0024 | REG_LIMIT_B | Analog Trigger Level for Channel | |||
[15:0] | LIMIT_B[15:0] | RW | 0x00 | Analog trigger level for channel B. 2's complement | ||
0x000A | 0x0028 | REG_FUNCTION_B | Analog Triggering Function | |||
[1:0] | TRIGGER_FUNCTION_B | RW | 0x00 | Analog triggering function for channel B: 0: Lower than limit 1: higher than limit 2: pass through high limit 3: passthrough low limit |
||
0x000B | 0x002c | REG_HYSTERESIS_B | Analog Trigger Hysteresis for Channel | |||
[31:0] | HYSTERESIS_B | RW | 0x00 | Used for the passthrough functions | ||
0x000C | 0x0030 | REG_TRIGGER_MUX_B | Trigger Selection for Path | |||
[3:0] | TRIGGER_MUX_B | RW | 0x00 | Selects trigger B mode: 0: Always on 1: Digital triggering, based on trigger[1] 2: ADC triggering, based on channel B 3: Reserved 4: Digital triggering OR ADC triggering 5: Digital triggering AND ADC triggering 6: Digital triggering XOR ADC triggering 7: Option 4 negated 8: Option 5 negated 9: Option 6 negated |
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0x000D | 0x0034 | REG_TRIGGER_OUT_CONTROL | Selection Multiplexer and embedded trigger selection | |||
[16] | EMBEDDE_TRIGGER | RW | 0x00 | When set the bit 15 of the out channel data will be the trigger. This alows to keep the data in sync with the trigger in future data processing, before feeding the data to the DMA. When set a util_extract module is required in the system. |
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[3:0] | TRIGGER_MUX_OUT | RW | 0x00 | Final Trigger Selection Multiplexer Selects trigger a mode: 0: Trigger A 1: Trigger B 2: Trigger A OR Trigger B 3: Trigger A AND Trigger B 4: Trigger A XOR Trigger B 5: Trigger LA 6: Trigger A OR Trigger LA 7: Trigger B OR Trigger LA 8: Trigger A OR Trigger B OR Trigger LA |
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0x000E | 0x0038 | REG_FIFO_DEPTH | Controls the Dynamic Depth of the History FIFO | |||
[31:0] | FIFO_DEPTH | RW | 0x00 | Controls the depth of the history FIFO. Should be less than the maximum FIFO depth. If set to 0, the FIFO is bypassed. | ||
0x000F | 0x003c | REG_TRIGGERED | Indicates Triggering Status | |||
[0] | TRIGGERED | RW1C | 0x00 | Indicates if the trigger has been triggered since the last time this register has been reset. | ||
0x0010 | 0x0040 | REG_TRIGGER_DELAY | Control the Trigger Delay | |||
[31:0] | TRIGGER_DELAY | RW | 0x00 | Delays the start of data capture with TRIGGER_DELAY number of samples after the trigger. | ||
0x0011 | 0x0044 | REG_STREAMING | Controls Streaming Mode | |||
[0] | STREAMING | RW | 0x00 | If the streaming bit is set, after the trigger condition is met data will be continuously captured by the DMA. The streaming bit must be set to 0 to reset triggering. | ||
0x0012 | 0x0048 | REG_TRIGGER_HOLDOFF | Controls hold off time | |||
[31:0] | TRIGGER_HOLDOFF | RW | 0x00 | Defines the time interval, after a trigger event, where the next trigger events will be ignored, until the end of the interval. The time interval is set by counter. Down-counting on the ADC clock(100MHz). The value written in the register is loaded in the counter at a trigger event. | ||
0x0013 | 0x004c | REG_TRIGGER_OUT_HOLD_PINS | Controls external trigger hold time | |||
[19:0] | TRIGGER_OUT_HOLD_PINS | RW | 0x00 | Defines a time period, in which the external trigger pins, configured as outputs, will hold the new logic level after a transition. The down-counter, counting on ADC clock, is loaded with the value written in the register after a new transition of the source trigger signal, if the counter is inactive. | ||
Tue Sep 1 09:58:53 2020 |