The flow control calendar length can be shorter than the MAX_CALLEN of the
Interlaken 600G IP core configuration. When
ctl_tx_fc_callen is a value of 0, the calendar
length become 16 and only ctl_tx_fc_stat[15:0] signals
are used.
When ctl_tx_fc_callen is a value of 1, the calendar length become 32 and
only ctl_tx_fc_stat[31:0] signals are used. And so forth. The valid
settings for calendar length are as follows:
- 0x0 = 16 entries
- 0x1 = 32 entries
- 0x3 = 64 entries
- 0x7 = 128 entries
- 0xF = 256 entries
All other values are reserved.
Note: The value selected
for
ctl_tx_fc_callen must be less than or equal to the value of
MAX_CALLEN. This input should be static and must only be changed during
reset.