ra8_etha_tas_entry_t Struct Reference

One TAS (802.1Qbv) RAM entry, exactly as HUM Table 32.6 defines it. More...

#include <ra8_etha_types.h>

Data Fields
uint32_t	gate_time_ns
	TAS.GT – entry duration in ns, 28 bits.
bool	gate_open
	TAS.GS – true opens this queue's gate.

Detailed Description

One TAS (802.1Qbv) RAM entry, exactly as HUM Table 32.6 defines it.

HUM Table 32.6 "TAS entry format" (p 1691) gives a TAS entry exactly two fields: a one-bit gate state GS and a 28-bit gate time GT in NANOSECONDS. There is no per-class gate vector inside an entry – the TAS RAM is partitioned per descriptor queue by ra8_etha_tas_queue_t, so an entry's single GS bit belongs to the queue whose block it sits in.

The previous shape of this struct modelled an entry as an eight-bit per-class gate vector plus a "cut-through" flag, which is the 802.1Qbv textbook layout but not this silicon's (#539).

Invariant

gate_time_ns fits in 28 bits (<= 0x0FFFFFFF).

Example:

const ra8_etha_tas_entry_t open_then_shut[2] = {
  {.gate_time_ns = 125000U, .gate_open = true},
  {.gate_time_ns = 875000U, .gate_open = false},
};

See also

ra8_etha_tas_queue_t

ra8_etha_set_tas_schedule

Definition at line 173 of file ra8_etha_types.h.

Field Documentation

gate_open

bool ra8_etha_tas_entry_t::gate_open

TAS.GS – true opens this queue's gate.

Definition at line 175 of file ra8_etha_types.h.

Referenced by internal_tas_learn_entry(), ra8_etha_read_tas_entry(), and tsn_tas_entry_matches().

gate_time_ns

uint32_t ra8_etha_tas_entry_t::gate_time_ns

TAS.GT – entry duration in ns, 28 bits.

Definition at line 174 of file ra8_etha_types.h.

Referenced by internal_tas_learn_entry(), ra8_etha_read_tas_entry(), and tsn_tas_entry_matches().

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The documentation for this struct was generated from the following file:

• libs/ra8_hal/inc/ra8_etha_types.h