Std. Core: Output Queues

Name

output_queues

Version

v1.0.0

Author

Original version for nf10:

Adam Covington (gcoving_at_stanford.edu)

Modified for NetFPGA-SUME by:

Noa Zilberman

Type

IP core (HW)

Location

lib/hw/std/cores/output_queues_v1_0_0/

Interface Types

AXI4-Stream

AXI-Lite

Busses

S_AXIS: Slave AXI4-Stream bus, Variable width

M_AXIS_0: Master AXI4-Stream bus, Variable width

M_AXIS_1: Master AXI4-Stream bus, Variable width

M_AXIS_2: Master AXI4-Stream bus, Variable width

M_AXIS_3: Master AXI4-Stream bus, Variable width

M_AXIS_4: Master AXI4-Stream bus, Variable width

S_AXI: Slave AXI4-Lite

Parameters

C_M_AXIS_DATA_WIDTH: Data width of the master AXI4-Stream data bus.

C_S_AXIS_DATA_WIDTH: Data width of the slave AXI4-Stream data bus.

C_M_AXIS_TUSER_WIDTH: Data width of the master TUSER bus.

C_S_AXIS_TUSER_WIDTH: Data width of the slave TUSER bus.

Register map

This module uses register infrastructure Ver 1.00, please refer to here for more details.

0x0 : ID - Block ID

0x4 : VERSION - Block Version

0x8 : FLIP - Returns the negative value of a written register

0xC: DEBUG - Debug register, returns the written value plus a preconfigured value

0x10 : PKTIN - Total number of incoming packets

0x14: PKTOUT - Total number of outgoing packets

0x18+0x1C*i: PKTSTOREDPORTi - Port i, stored Packets

0x1C+0x1C*i: BYTESSTOREDPORTi - Port i, stored bytes

0x20+0x1C*i: PKTREMOVEDPORTi - Port i, removed (sent to port) packets

0x24+0x1C*i: BYTESREMOVEDPORTi - Port i, removed (sent to port) bytes

0x28+0x1C*i: PKTDROPPEDPORTi- Port i, dropped packets

0x2C+0x1C*i: BYTESDROPPEDPORTi- Port i, dropped bytes

0x30+0x1C*i: PKTINQUEUEPORTi - Port i, packets in queue

Description

A BRAM based output queues block. It stores per-port (4x SFP+ and 1x PCIe) the outgoing packets and hands over the (per port) packets to the (relevant) 10G interface.

Note

The output queues have been implemented with no back pressure. Possible drops to the pipeline can happen either to the interfaces core or to the output queues. With implemented back pressure to this core, drops should happen only to the interfaces.