description = "Unit generating PPS signals and acting as a UTC real-time clock";
hdl_entity = "pps_gen_wb";
prefix = "ppsg";
reg {
name = "Control Register";
prefix = "CR";
field {
name = "Reset counter";
description = "write 1: resets the counter\
write 0: no effect";
prefix = "CNT_RST";
type = MONOSTABLE;
clock = "refclk_i";
};
field {
name = "Enable counter";
description = "1: PPS counter is enabled";
prefix = "CNT_EN";
type = BIT;
access_bus = READ_WRITE;
access_dev = READ_ONLY;
clock = "refclk_i";
};
field {
name = "Adjust offset";
description = "write 1: Starts adjusting PPS/UTC offsets by adding the values taken from ADJ_NSEC, ADJ_UTCLO, ADJ_UTCHI registers to the current PPS counter value. These registers need to be programmed prior to update.\
write 0: no effect\
read 0: adjustment operation is done\
read 1: adjustment operation is in progress";
prefix = "CNT_ADJ";
type = BIT;
access_bus = READ_WRITE;
access_dev = READ_WRITE;
load = LOAD_EXT;
clock = "refclk_i";
};
field {
name = "Set time";
description = "write 1: Sets the UTC/PPS counter to values taken from ADJ_NSEC, ADJ_UTCLO, ADJ_UTCHI registers";
prefix = "CNT_SET";
type = MONOSTABLE;
clock = "refclk_i";
};
field {
name = "PPS Pulse width";
description = "Width of generated PPS pulses in 125 MHz refernce clock cycles";
prefix = "PWIDTH";
size = 28;
type = SLV;
access_bus = READ_WRITE;
access_dev = READ_ONLY;
clock= "refclk_i";
};
};
reg {
name = "Nanosecond counter register";
description = "Nanosecond part of current time, expressed as number of 125 MHz reference clock cycles";
prefix = "CNTR_NSEC";
field {
name = "Nanosecond counter";
type = SLV;
size = 28;
access_bus = READ_ONLY;
access_dev = WRITE_ONLY;
clock = "refclk_i";
};
};
reg {
name = "UTC Counter register (least-significant part)";
description = "Lower 32 bits of current UTC time";
prefix = "CNTR_UTCLO";
field {
name = "UTC Counter";
type = SLV;
size = 32;
access_bus = READ_ONLY;
access_dev = WRITE_ONLY;
clock = "refclk_i";
};
};
reg {
name = "UTC Counter register (most-significant part)";
description = "Highest 8 bits of current UTC time";
prefix = "CNTR_UTCHI";
field {
name = "UTC Counter";
type = SLV;
size = 8;
access_bus = READ_ONLY;
access_dev = WRITE_ONLY;
clock = "refclk_i";
};
};
reg {
name = "Nanosecond adjustment register";
description = "Adjustment value for nanosecond counter";
prefix = "ADJ_NSEC";
field {
name = "Nanosecond adjustment";
type = PASS_THROUGH;
size = 28;
};
};
reg {
name = "UTC Adjustment register (least-significant part)";
description = "Lower 32 bits of adjustment value for UTC";
prefix = "ADJ_UTCLO";
field {
name = "UTC Counter adjustment";
type = PASS_THROUGH;
size = 32;
};
};
reg {
name = "UTC Adjustment register (most-significant part)";
description = "Highest 8 bits of adjustment value for UTC";
prefix = "ADJ_UTCHI";
field {
name = "UTC Counter adjustment";
type = PASS_THROUGH;
size = 8;
};
};
reg {
name = "External sync control register";
prefix = "ESCR";
field {
name = "Sync to external PPS input";
description = "write 1: Waits until a pulse on external PPS input arrives and re-synchronizes the PPS counter to it\
