Registers

Summary

ALERT_TEST

Alert Test Register

• Offset: 0x0
• Reset default: 0x0
• Reset mask: 0x1

Fields

{"reg": [{"name": "fatal_fault", "bits": 1, "attr": ["wo"], "rotate": -90}, {"bits": 31}], "config": {"lanes": 1, "fontsize": 10, "vspace": 130}}

REGWEN

Register write enable for all control registers

• Offset: 0x4
• Reset default: 0x1
• Reset mask: 0x1

Fields

{"reg": [{"name": "REGWEN", "bits": 1, "attr": ["rw0c"], "rotate": -90}, {"bits": 31}], "config": {"lanes": 1, "fontsize": 10, "vspace": 80}}

CFG

Configuration register

• Offset: 0x8
• Reset default: 0x38008000
• Reset mask: 0xffffffff
• Register enable: REGWEN

Fields

{"reg": [{"name": "CLK_DIV", "bits": 27, "attr": ["rw"], "rotate": 0}, {"name": "DC_RESN", "bits": 4, "attr": ["rw"], "rotate": -90}, {"name": "CNTR_EN", "bits": 1, "attr": ["rw"], "rotate": -90}], "config": {"lanes": 1, "fontsize": 10, "vspace": 90}}

CFG . CNTR_EN

Assert this bit to enable the PWM phase counter. Clearing this bit disables and resets the phase counter.

CFG . DC_RESN

Phase Resolution (logarithmic). All duty-cycle and phase shift registers represent fractional PWM cycles, expressed in units of 2^-16 PWM cycles. Each PWM cycle is divided into 2^(DC_RESN+1) time slices, and thus only the (DC_RESN+1) most significant bits of each phase or duty cycle register are relevant.

CFG . CLK_DIV

Sets the period of each PWM beat to be (CLK_DIV+1) input clock periods. Since PWM pulses are generated once every 2^(DC_RESN+1) beats, the period between output pulses is 2^(DC_RESN+1)*(CLK_DIV+1) times longer than the input clock period.

PWM_EN

Enable PWM operation for each channel

• Offset: 0xc
• Reset default: 0x0
• Reset mask: 0x3f
• Register enable: REGWEN

Fields

{"reg": [{"name": "EN_0", "bits": 1, "attr": ["rw"], "rotate": -90}, {"name": "EN_1", "bits": 1, "attr": ["rw"], "rotate": -90}, {"name": "EN_2", "bits": 1, "attr": ["rw"], "rotate": -90}, {"name": "EN_3", "bits": 1, "attr": ["rw"], "rotate": -90}, {"name": "EN_4", "bits": 1, "attr": ["rw"], "rotate": -90}, {"name": "EN_5", "bits": 1, "attr": ["rw"], "rotate": -90}, {"bits": 26}], "config": {"lanes": 1, "fontsize": 10, "vspace": 80}}

INVERT

Invert the PWM output for each channel

• Offset: 0x10
• Reset default: 0x0
• Reset mask: 0x3f
• Register enable: REGWEN

Fields

{"reg": [{"name": "INVERT_0", "bits": 1, "attr": ["rw"], "rotate": -90}, {"name": "INVERT_1", "bits": 1, "attr": ["rw"], "rotate": -90}, {"name": "INVERT_2", "bits": 1, "attr": ["rw"], "rotate": -90}, {"name": "INVERT_3", "bits": 1, "attr": ["rw"], "rotate": -90}, {"name": "INVERT_4", "bits": 1, "attr": ["rw"], "rotate": -90}, {"name": "INVERT_5", "bits": 1, "attr": ["rw"], "rotate": -90}, {"bits": 26}], "config": {"lanes": 1, "fontsize": 10, "vspace": 100}}

PWM_PARAM

Basic PWM Channel Parameters

• Reset default: 0x0
• Reset mask: 0xc000ffff

Instances

Fields

{"reg": [{"name": "PHASE_DELAY", "bits": 16, "attr": ["rw"], "rotate": 0}, {"bits": 14}, {"name": "HTBT_EN", "bits": 1, "attr": ["rw"], "rotate": -90}, {"name": "BLINK_EN", "bits": 1, "attr": ["rw"], "rotate": -90}], "config": {"lanes": 1, "fontsize": 10, "vspace": 100}}

PWM_PARAM . BLINK_EN

Enables blink (or heartbeat). If cleared, the output duty cycle will remain constant at DUTY_CYCLE.A. Enabling this bit causes the PWM duty cycle to alternate between DUTY_CYCLE.A and DUTY_CYCLE.B

PWM_PARAM . HTBT_EN

Modulates blink behavior to create a heartbeat effect. When HTBT_EN is set, the duty cycle increases (or decreases) linearly from DUTY_CYCLE.A to DUTY_CYCLE.B and back, in steps of (BLINK_PARAM.Y+1), with an increment (decrement) once every (BLINK_PARAM.X+1) PWM cycles.

When HTBT_EN is cleared, the standard blink behavior applies, meaning that the output duty cycle alternates between DUTY_CYCLE.A for (BLINK_PARAM.X+1) pulses and DUTY_CYCLE.B for (BLINK_PARAM.Y+1) pulses.

PWM_PARAM . PHASE_DELAY

Phase delay of the PWM leading edge, in units of 2^(-16) PWM cycles. The leading edge will be the rising edge of the output signal unless the corresponding INVERT bit is set.

DUTY_CYCLE

Controls the duty_cycle of each channel.

• Reset default: 0x7fff7fff
• Reset mask: 0xffffffff

Instances

Fields

{"reg": [{"name": "A", "bits": 16, "attr": ["rw"], "rotate": 0}, {"name": "B", "bits": 16, "attr": ["rw"], "rotate": 0}], "config": {"lanes": 1, "fontsize": 10, "vspace": 80}}

DUTY_CYCLE . B

The target duty cycle for PWM output, in units of 2^(-16)ths of a pulse cycle. The actual precision is however limited to the (DC_RESN+1) most significant bits. This setting only applies when blinking, and determines the target duty cycle.

DUTY_CYCLE . A

The initial duty cycle for PWM output, in units of 2^(-16)ths of a pulse cycle. The actual precision is however limited to the (DC_RESN+1) most significant bits. This setting applies continuously when not blinking and determines the initial duty cycle when blinking.

BLINK_PARAM

Hardware controlled blink/heartbeat parameters.

• Reset default: 0x0
• Reset mask: 0xffffffff

Instances

Fields

{"reg": [{"name": "X", "bits": 16, "attr": ["rw"], "rotate": 0}, {"name": "Y", "bits": 16, "attr": ["rw"], "rotate": 0}], "config": {"lanes": 1, "fontsize": 10, "vspace": 80}}

BLINK_PARAM . Y

This blink-rate timing parameter has two different interpretations depending on whether or not the heartbeat feature is enabled. If heartbeat is disabled, a blinking PWM will pulse at duty cycle B for (Y+1) pulse cycles before returning to duty cycle A. If heartbeat is enabled the duty cycle will increase (or decrease) by (Y+1) units every time it is incremented (or decremented).

BLINK_PARAM . X

This blink-rate timing parameter has two different interpretations depending on whether or not the heartbeat feature is enabled. If heartbeat is disabled, a blinking PWM will pulse at duty cycle A for (X+1) pulse cycles before switching to duty cycle B. If heartbeat is enabled the duty cycle will start at duty cycle A, but will be incremented (or decremented) every (X+1) cycles. In heartbeat mode is enabled, the size of each step is controlled by BLINK_PARAM.Y.