description = "This FIFO holds the TX packet timestamps gathered from all switch endpoints. Each entry contains a single timestamp value consisting of 2 numbers:\
- VAL_R - the timestamp taken at rising clock edge. This is the main timestamp value\
- VAL_F - few LSBs of timestamp taken at falling clock edge. It's used in conjunction with VAL_R to determine if the timestamp has been taken\
properly (there was no metastability/setup/hold violation)\
Entries also contain information required to identify the endpoint and frame for which the timestamp was taken:\
- FID - Frame identifier assigned by the NIC\
- PID - TXTSU port ID to which came the timestamp. Used to distinguish the timestamps for broadcast/multicast frames;\
- INCORRECT - timestamp may be incorrect, it has been generated during timebase adjustment";
flags_bus = {FIFO_FULL, FIFO_EMPTY, FIFO_COUNT};
flags_dev = {FIFO_FULL, FIFO_EMPTY};
field {
name = "Rising edge timestamp";
descritpion = "Timestamp value taken on rising clock edge (full word)";
prefix = "val_r";
type = SLV;
size = 28;
};
field {
name = "Falling edge timestamp";
description = "Timestamp value taken on falling clock edge (few LSBs)";
prefix = "val_f";
type = SLV;
size = 4;
};
field {
name ="Physical port ID";
description = "Identifier of the TXTSU port to which came the timestamp. There may be multiple timestamps sharing the same FID value for broadcast/multicast packets.";
prefix = "pid";
type = SLV;
size = 5;
align= 16;
};
field {
name = "Frame ID";
description = "OOB Frame Identifier. Used to associate the timestamp value with transmitted packet.";
prefix = "fid";
type = SLV;
size = 16;
align = 16;
};
field {
name = "Timestamp (possibly) incorrect";
description = "1: This timestamp may be incorrect (generated during PPS adjustment)\
0: Timestamp is correct.";
prefix = "incorrect";
type = BIT;
};
};
-- TXTSU interrupts
irq {
name = "TXTSU fifo not-empty";
description = "Interrupt active when TXTSU shared FIFO contains any timestamps.";