CRKIT R5 Architecture

rev 0.1

WINLAB – Rutgers University

April 25, 2013

Khanh Le

R5 Architecture Summary• Objective : migration of R4 to Zynq platform + support of new RF module (400MHz-4GHz tuning range)

• Zynq : Integrated dual-core ARM processor + peripherals e.g. GigE, USB, i2c, SPI, UART…

• What are the Hardware implications ?

1. Access to GigE port through AMBA AXI bus -> new Ethernet port module (ethernet framing by

PS)

2. New RF ports e.g. DA/AD interface modules

3. New PCORE wrapper containing ARM processor and dual AXI busses

4. New AXI ipif modules for AXI bus interfacing : one for RMAP Processor, one for Ethernet port

5. Replace SPI with I2C interface. Current SPI is no longer needed (remove). I2C is provided by PS.

6. Potentially replace all R4 FIFOs and Block RAMs

7. New clock architecture

•What are the Software implications ?

1. Add DMA support for PS GigE -> PL Ethernet Port

2. Add DMA support for PL Ethernet Port -> PS GigE

3. Some changes to overall memory map due to dual AXI bus architecture

4. Changes to RF control due to I2C interface and new radio (refer to ADI reference design)

•APP design remains the same, only Xilinx IPs may need to be replaced due to tool revision updates

•Overall software remain the same, no Linux support for the initial phase.

•Once HW is stable, port Linux including VITA support.

•Target design methodology : mixed-language, C/SystemC, UVM

•Goal for DARPA Challenge : functional spectrum sensing APP (mid-august time frame)

Implications to R4 ArchitectureModify access thru AXI bus

Serial IO + ref. clock modifications

SPI no longerapplicable.Replace with I2C interface

Replace with ARM core, contains dual AMBA AXI busses : AXI0 -> GbE, AXI1 -> Framework

Replace PLB IPIFwith AXI IPIF

Zynq System-on-Chip Overview

ProgrammablePeripherals :UART, I2C, GigE

CPU Cores

AXI Master/Slave Ports

Programmable Logic (PL)

Processor subsystem (PS)

Refer to Xilinx user guide ug585-Zynq-7000-TRM.pdf for further details

Fixed external IO pins

CRKIT Framework Integration

PCORE

AX

I1

GbE

RMAPProcessor

AXI0

0x4000_00000x7FFF_FFFF

0x8000_00000xBFFF_FFFF

CRKIT

AXI IPIF

AX

I IPIF

APP + PKTRF

AXI0 – 32-bit, Master PortAXI1 – 32-bit, Master Port

PS <-> IPIF data paths

PS

M

PL

S M

PL

S M

system_processing_system7_0_wrapper(processor)

system_axi_interconnect_0_wrapper(axi bus 0)

system_axi_ext_slave_conn_0_wrapper(external connector 0)

PL

SMaxi_ipif_slv

(gbe)

BUS2IP

IP2BUS

PCORE

Bring internal AXI signals to top level

M

PL

S M

PL

S M

system_axi_interconnect_1_wrapper(axi bus 1)

system_axi_ext_slave_conn_1_wrapper(external connector 1)

PL

SM

axi_ipif_slv( rmap processor)

BUS2IP

IP2BUS

0x4000_00000x7FFF_FFFF

0x8000_00000xBFFF_FFFF

M_AXI_GP0

M_AXI_GP1

R4 - host2appPCORE CMD FORMAT

If (V==1) then VITA context packetElse non-VITA packet use ethertype field for further parsingEndif;

Forward ethernet payload if :

incoming MAC = dMAC incoming MAC = Broadcast

Append Ethertype field (16-bit) to ethernet payload

if (ethertype == IPv4 & Incoming IP == dIP & UDP = 1000) then forward UDP payload to VITA Receiver

else

forward packet to PCORE

Ethertype = 0x0800 - IPv4 0x0806 - ARP

Use CMD_CNT as ACK to MEM_CTL to indicate completion of PCORE data removal from MEM.

REPLACE

GbE

GbE -> IP Data Path (Option 1)

DPRAM

DM

A

AX

I SLA

VE

IPIF

PKTCTL

CMD FIFO

Elastic Buffer

AXI BUS 0

GbE Rx (R5)

Skip ETH header, Prepend Ethertype field to payload

Packet Processor (R4)

Complete ETH packet storage(circular buffer)

Ethertype field +IP packet

0152931

ptr[15:0]size[13:0]-

Processor Subsystem

CRKITFramework

3. Generate CMD ARMCortex A9

2. DMA done

1. DMA xfer

Fixed length buffer size allocatione.g. min. 1600 bytes -> 400 words(may depend of DP RAM size -> end on a full buffer boundary)

-MAC filtering-Jumbo frames not supported

GbE

GbE -> IP Data Path (Option 2, no processor assistance)

DPRAM

DM

A

AX

I SLA

VE

IPIF PKT

CTL

CMD FIFO

Elastic Buffer

AXI BUS 0

GbE Rx (R5)

Skip ETH header, Prepend Ethertype field to payload

Packet Processor (R4)

Complete ETH packet storage(circular buffer)

Ethertype field +IP packet

0152931

ptr[15:0]size[13:0]-

Processor Subsystem

CRKITFramework

ARMCortex A9

2. DMA done

1. DMA xfer

Fixed length buffer size allocatione.g. min. 1600 bytes -> 400 words(may depend of DP RAM size -> end on a full buffer boundary)

-MAC filtering-Jumbo frames not supported

CMDGEN

Snoop on bus Interface to generate CMDs (write only).

GbE -> IP Data & Control Flows

On-chipMemory256KB

GbE DM

A

ARMCortex A9

BRAM

1. Init Rx Buffer Descriptors (RBD) (refer to ug585, pg. 418)

2. +Init DMA controller +init ptr to RBD entries +enable GbE receiver (refer to programming guide, ug585, pg. 436)

GbE

OCMBRAM

8-byte descriptor 1600-byte buffer

3. Fetch descriptor (ptr to BRAM)

4. DMA xfer

5. Update xfer control stat

6. DMA done intr

16 RBD entries e.g. 32 words

7. +Search for used descriptor e.g. ownership flag == 1 +clear ownership flag (allows descriptor to be

reused by GbE DMA ctl.)

Assuming available rx packet

Enable Receiver :gem.net_ctrl[rx_en] == 1

Refer to ug585, Programming guide, page 436 for additional details.

Rx Buffer Descriptor Entry

Pointer to Rx DPRAM buffer

Ownership flag

Reference : ug585, page 418

R4 - app2host

VRT Receiver

Lookup using PortID

dMAC/Ethertype from IPProcessor

if (IP == 1) then Enable IP processing (append dIP, sIP & UDP) Forward dMAC/Ethertype (Note, sMAC provided in RMAP)

else

Disable IP Processing Forward dMAC/Ethertype (Note, sMAC provided in RMAP)

endif

Lookup using PortID

if (V == 1) then Enable VITA formatting else

Disable VITA formatting endif

dMAC/Ethertype appended to IP/VITA data

REPLACE

GbE

IP -> GbE Data Path

DPRAM

DM

A

AX

I SLA

VE

IPIF

ETHHDRGEN

CMD FIFO

Elastic Buffer

AXI BUS 0

GbE Tx (R5) Packet Processor (R4)

2. Fetch CMD

Fixed length buffer allocation

dMAC +Ethertype +IP packet

+Jumbo frames not supported+ append FCS field (enabled at Tx Buffer Descriptor)

Processor Subsystem

CRKITFramework

ARMCortex A9

CMDGEN

INT REG

1. Intr

4. Setup DMA

5. DMA xfer

0152931

ptr[15:0]size[13:0]-

Fixed length buffer size allocatione.g. min. 1600 bytes -> 400 words(may depend of DP RAM size -> end on a full buffer boundary)

Generate complete Ethernet header e.g. dMAC,sMAC, ethertype/size.FCS added by PS GbE MAC

sMAC

CTL REG

IP -> GbE Data & Control Flows

On-chipMemory256KB

GbE DM

AARM

Cortex A9

CRKITGbE Tx

3. +setup Tx Buffer Descriptors (TBD) +clear used flag (refer to ug585, pg. 423)

4. Set Transmit_Start bit e.g. bit-9 of Network Control

register) (ug585, pg. 436)

5. Fetch descriptor (ptr to ETH packet)

6. DMA xfer

7. Update xfer control stat(set used flag to ‘1’)

1 TBD entry e.g. 2 words

Assuming available tx packet

1. intr 2. Fetch CMD size + ptr

Init. + enable Tx DMA engine( gem.net_ctrl[tx_en] == 1)

Refer to ug585, Programming guide, page 436 for additional details.

8. DMA done intr (optional)9. clear all status bits, including used flag (optional)

Tx Buffer Descriptor EntryPointer to Tx Buffer

used flag

Reference : ug585, page 423

wrap flag

Set to 1 for single buffer

DA Port

AD Port

Clock architecture

Memory Map

R4 - PCORE

PCORE – RMAP RD/WR

IP

Host -> PCORE(UDP-1001)

IP

PCORE -> Host(UDP-1001)

Address Decoding

RTYPE: 0x2000 – RMAP READ 0x2001 – RMAP WRITE RADDR: Register address

RDATA: Register data

R4 - APP

R4 – Memory MapUpper 4 MSBs :

0x0-0x1 : PCORE0x2 : CRKITOthers : Unused

0x0 : CMN0x1 : ETH0x2 : PKT0x4-0xB : APP0xC : DAC IF0xD : ADC IF

INTSPI, LEDDCM/CLOCKCE

R4 – Interrupt Architecture

INTCuP IPIF CMN INT

ETH INT

PKT INT

APP INT

SYS INT

PCORE CR