Texas Instruments TSW1405EVM User manual

www.latticesemi.com 1rd1127_01.2

May 2012 Reference Design RD1127

or product names are trademarks or registered trademarks of their respective holders. The specifications and information herein are subject to change without notice.

Introduction

The TSW1405EVM Low Cost Data Capture Card from Texas Instruments (TI) assists designers in prototyping and

evaluating the performance of high-speed ADCs that feature parallel/serial LVDS outputs. The evaluation module

features a powerful LatticeECP3™-35 FPGA. The FPGA can be used as a flexible and rapid prototyping environ-

ment for digital design, interfacing directly to the LVDS output of the TI ADC under evaluation. This HDL reference

design is available for users to get started with the evaluation board and capture ADC data using the TI High Speed

Data Converter Pro software.

Figure 1. Hardware Evaluation Overview

Currently, HDL reference designs targeting the LatticeECP3 device support the following TI device families:

• ADS41xx and ADS61xx single channel

• ADS62Pxx and ADS42xx dual channel

• ADS58C48 four channel

• ADS5400 dual bus

• ADS5463 single channel

• ADS5485 single channel

The HDL reference designs for these converters contain two primary modules for capturing the LVDS data from the

ADC.

•ADCIF – Contains the I/O logic and gearing functions for the LVDS pins. It also converts the double data rate

(DDR) input channel to a single data rate (SDR) parallel bus.

•DUMPMEM_TOP – Stores the channel’s parallel data to internal DPRAM. The ADC data extracts a SPI control-

ler within the module. The High Speed Data Converter Pro software can import the data from this controller

through the USB port.

ADCIF module is the only design block required if the user desires to implement their own design using the

ADS41xx/ADS61xx, ADS62Pxx/ADS42xx, ADS58C48, ADS5400, ADS5463, ADS5485 with the LatticeECP3

device. The top level design instantiates the primary modules and connects them together. It also contains a LED

blinker circuit. This circuit flashes the LED when the LVDS clock output from the ADC is running and is available to

the FPGA. Figures 2 to 7 show the block diagrams for each respective ADC design.

ADS EVM

TSW1405

High Speed Data Converter Pro

TI TSW1405 High-Speed ADC

Evaluation Board

HDL User’s Guide

TI TSW1405 High-Speed ADC Evaluation Board

HDL User’s Guide

Figure 2. Single Channel ADC Block Diagram (ADS41xx/ADS61xx)

Figure 3. Dual Channel ADC Block Diagram (ADS62Pxx/ADS42xx)

TSW1405_1ch_bit_wise

ADCIF DUMPMEM_TOP

clk_lvds_rx_p

lvds_rx_port0

lvds_rx_port1

rt1

12 iDDRx2

{[12:9], [7:4]} sample 0

sample 1

[15:0]

[15:0] 16

DUMPMEM_DP

DUMPMEM_SPI

DUMPMEM_WCTRL

DUMPMEM_RCTRL

spi_miso

spi_clk

spi_ss

reset_n

LED

ADC Clock Counter

TSW1405_2ch_bit_wise

DUMPMEM_TOP

clk_lvds_rx_p

lvds_rx_port0

lvds_rx_port1

ort1

{[15:9], [7:1]}

spi_miso

spi_clk

ilk

spi_ss

reset_n

LED

[13:0]

sample 0 chan 0

sample 1 chan 0

sample 0 chan 1

sample 1 chan 1

cap_chans

ADCIF

DUMPMEM_DP

DUMPMEM_WCTRL

DUMPMEM_RCTRL

DUMPMEM_SPI

ADC Clock Counter

iDDRx2

TI TSW1405 High-Speed ADC Evaluation Board

HDL User’s Guide

Figure 4. Four Channel ADC Block Diagram (ADS58C48)

Figure 5. Dual Bus ADC Block Diagram (ADS5400)

TSW1405_2ch_bit_wise

ADCIF DUMPMEM_TOP

sample 0, chan 0

sample 1, chan 0

sample 0, chan 1

sample 1, chan 1

sample 0, chan 2

sample 1, chan 2

sample 0, chan 3

[11:0]

iDDRx2 DUMPMEM_DP

DUMPMEM_SPI

DUMPMEM_WCTRL

DUMPMEM_RCTRL

spi_miso

{[28:17], [15:10], [7:2]}

cap_chans

clk_lvds_rx_p

lvds_rx_port0

lvds_rx_port1

spi_clk

spi_ss

reset_n

TSW1405_dual_bus

ADCIF DUMPMEM_TOP

clk_lvds_rx_p

lvds_rx_port0

sample 0, chan A 16

sample 0, chan B

sample 1, chan A

sample 1, chan B

sample 2, chan A

sample 2, chan B

sample 3, chan A

sample 3, chan B

lvds_rx_port1

iDDRx2

DUMPMEM_DP

DUMPMEM_SPI

DUMPMEM_WCTRL

DUMPMEM_RCTRL

spi_miso

LED

spi_clk

spi_ss

reset_n

ADC Clock Counter

{[11:0], h’40}

{[28:17],

[14:3]} {[11:0], h’40}

{[11:0], h’40}

TI TSW1405 High-Speed ADC Evaluation Board

HDL User’s Guide

Figure 6. Single Channel ADC Block Diagram (ADS5463)

Figure 7. Single Channel ADC Block Diagram (ADS5485)

The input of the ADCIF module is the single or dual channel double data rate (DDR) output from the ADC. This

input is converted to two single data rate buses for each channel at half the rate of the ADC input clock. The single

channel design is capable of handling up to eight LVDS DDR inputs from the ADC. The dual channel design is

capable of handling up to seven LVDS DDR inputs for the ADC. Table 2 describes the ADCIF I/O for single and dual

channel designs.

TSW1405_sample_wise

ADCIF DUMPMEM_TOP

clk_lvds_rx_p

lvds_rx_port0

lvds_rx_port1

[14:1]

IDDRx2

DUMPMEM_DP

DUMPMEM_SPI

DUMPMEM_WCTRL

DUMPMEM_RCTRL

spi_miso

spi_clk

spi_ss

reset_n

LED

ADC Clock Counter

{[13:0], 4’h0}

sample 0

sample 1

sample 2

sample 3

TSW1405_1ch_edge_bit_wise

ADCIF DUMPMEM_TOP

clk_lvds_rx_p

lvds_rx_port0

lvds_rx_port1

17 {[12:9], [7:4]}

IDDRx2

DUMPMEM_DP

DUMPMEM_SPI

DUMPMEM_WCTRL

DUMPMEM_RCTRL

spi_miso

spi_clk

spi_ss

reset_n

LED

ADC Clock Counter

{[13:0], 4’h0}

sample 0

sample 1

sample 2

sample 3

TI TSW1405 High-Speed ADC Evaluation Board

HDL User’s Guide

Figure 8. ADCIF Module

Table 1. ADCIF Module NGO I/O Descriptions

ADCIF Signal

TSW1405_1ch_bit_

wise

TSW1405_2ch_bit_

wise

TSW1405_4ch_bit_

wise TSW1405_dual_bus

TSW1405_sample_

wise

TSW1405_1ch_edge

_bit_wise Description

reset_n——————Designmodulereset

clk_adc_ext——————Clockinput

inv_data Reserved Reserved Reserved Reserved Reserved Reserved —

inv_clk Reserved Reserved Reserved Reserved Reserved Reserved —

lsb_first Reserved Reserved Reserved Reserved Reserved Reserved —

din[28:0] {din[12:9],din[7:4]} =

Channel 1 input [7:0]

din[7:1] =

Channel 1 input

din[28:23] =

Channel 1 input

din[14:3] =

Channel A input

din[14:1] = Channel 1

input

{din[12:9],din[7:4]} =

Channel 1 input

ADC DDR data input

din[15:9] =

Channel 2 input

din[15:10] = Channel 2

input

din[28:17] = Channel B

input

din[7:2] =

Channel 3 input

din[22:17] =

Channel 4 input

cap_depth[1:0] Reserved Reserved Reserved Reserved Reserved Reserved —

cap_format[2:0] Reserved Reserved Reserved Reserved Reserved Reserved —

cap_chans[7:0] Reserved 8’d0: Channel 1 – 2

samples/clock

8’d0: Channel 1 – 2

samples/clock

Reserved Reserved Reserved

8’d2: Channel 2 – 2

samples/clock

8’d2: Channel 2 – 2

samples/clock

Output control mux

8’d3: Dual channel – 4

samples/clock

8’d4: Channel 3 – 2

samples/clock

8’d8: Channel 4 – 2

samples/clock

8'd3: Channels 1 & 2 -

4 samples/clock

8'd12: Channels 3 & 4

- 4 samples/clock

8'd15: Channels 1, 2,

3 & 4 - 8 sam-

ples/clock

clk_adc——————clk_adc=

clk_adc_ext/2

dout1[15:0] Sample 0 Output See Table 2,

dout1[1:0] = 2’b00

See Table 3,

dout1[3:0] = 4’b0000

Chan B, Sample 0

Output

Sample 0 Output,

dout1[1:0] = 2’b00

Sample 0 Output Single data rate output

dout2[15:0] Sample 0 Output See Table 2,

dout2[1:0] = 2’b00

See Table 3,

dout2[3:0] = 4’b0000

Chan A, Sample 0

Output

Sample 0 Output,

dout2[1:0] = 2’b00

Sample 0 Output Single data rate output

dout3[15:0] Sample 0 Output See Table 2,

dout3[1:0] = 2’b00

See Table 3,

dout3[3:0] = 4’b0000

Chan B, Sample 1

Output

Sample 1 Output,

dout3[1:0] = 2’b00

Sample 0 Outputs Single data rate output

dout4[15:0] Sample 0 Output See Table 2,

dout4[1:0] = 2’b00

See Table 3,

dout4[3:0] = 4’b0000

Chan A, Sample 1

Output

Sample 1 Output,

dout4[1:0] = 2’b00

Sample 0 Output Single data rate output

dout5[15:0] Sample 1 Output See Table 2,

dout5[1:0] = 2’b00

See Table 3,

dout5[3:0] = 4’b0000

Chan B, Sample 2

Output

Sample 2 Output,

dout5[1:0] = 2’b00

Sample 1 Output Single data rate output

dout6[15:0] Sample 1 Output See Table 2,

dout6[1:0] = 2’b00

See Table 3,

dout6[3:0] = 4’b0000

Chan A, Sample 2

Output

Sample 2 Output,

dout6[1:0] = 2’b00

Sample 1 Output Single data rate output

dout7[15:0] Sample 1 Output See Table 2,

dout7[1:0] = 2’b00

See Table 3,

dout7[3:0] = 4’b0000

Chan B, Sample 3

Output

Sample 3 Output,

dout7[1:0] = 2’b00

Sample 1 Output Single data rate output

dout8[15:0] Sample 1 Output See Table 2,

dout8[1:0] = 2’b00

See Table 3,

dout8[3:0] = 4’b0000

Chan A, Sample 3

Output

Sample 3 Output,

dout8[1:0] = 2’b00

Sample 1 Output Single data rate output

clk_adc

dout1[15:0]

dout2[15:0]

dout3[15:0]

dout4[15:0]

dout5[15:0]

dout6[15:0]

dout7[15:0]

dout8[15:0]

clk_adc_ext

ADCIF

inv_data

inv_clk

lsb_first

reset_n

din[28:0]

cap_depth[1:0]

cap_format[2:0]

cap_chans[7:0]

TI TSW1405 High-Speed ADC Evaluation Board

HDL User’s Guide

Table 2. Output Control Mux Settings for Dual Channel Designs

Table 3. Output Control Mux Settings for Four Channel Designs

cap_chans Setting Channel(s) dout1 dout2 dout3 dout4 dout5 dout6 dout7 dout8

cap_chans = 0 or 1 Channel 1 Sample 0 Sample 0 Sample 0 Sample 0 Sample 1 Sample 1 Sample 1 Sample 1

cap_chans = 2 Channel 2 Sample 0 Sample 0 Sample 0 Sample 0 Sample 1 Sample 1 Sample 1 Sample 1

cap_chans = 4 Channel 3 Sample 0 Sample 0 Sample 0 Sample 0 Sample 1 Sample 1 Sample 1 Sample 1

cap_chans = 8 Channel 4 Sample 0 Sample 0 Sample 0 Sample 0 Sample 1 Sample 1 Sample 1 Sample 1

cap_chans = 3 Channel 1 Sample 0 Sample 0 Sample 1 Sample 1

Channel 2 Sample 0 Sample 0 Sample 1 Sample 1

cap_chans = 12 Channel 3 Sample 0 Sample 0 Sample 1 Sample 1

Channel 4 Sample 0 Sample 0 Sample 1 Sample 1

cap_chans = 15

Channel 1 Sample 0 Sample 1

Channel 2 Sample 0 Sample 1

Channel 3 Sample 0 Sample 1

Channel 4 Sample 0 Sample 1

cap_chans

Setting Channel(s) dout1 dout2 dout3 dout4 dout5 dout6 dout7 dout8

cap_chans = 0 or 1 Channel 1 Sample 0 Sample 0 Sample 0 Sample 0 Sample 1 Sample 1 Sample 1 Sample 1

cap_chans = 2 Channel 2 Sample 0 Sample 0 Sample 0 Sample 0 Sample 1 Sample 1 Sample 1 Sample 1

cap_chans = 4 Channel 3 Sample 0 Sample 0 Sample 0 Sample 0 Sample 1 Sample 1 Sample 1 Sample 1

cap_chans = 8 Channel 4 Sample 0 Sample 0 Sample 0 Sample 0 Sample 1 Sample 1 Sample 1 Sample 1

cap_chans = 3 Channel 1 Sample 0 Sample 0 Sample 1 Sample 1

Channel 2 Sample 0 Sample 0 Sample 1 Sample 1

cap_chans = 12 Channel 3 Sample 0 Sample 0 Sample 1 Sample 1

Channel 4 Sample 0 Sample 0 Sample 1 Sample 1

cap_chans = 15

Channel 1 Sample 0 Sample 1

Channel 2 Sample 0 Sample 1

Channel 3 Sample 1 Sample 1

Channel 4 Sample 0 Sample 1

TI TSW1405 High-Speed ADC Evaluation Board

HDL User’s Guide

Table 4. Single Channel Design Signal Names and Pinout

Signal Name LatticeECP3 Pin Direction Definition

reset_n C21 Input Master Reset

clk_lvds_rx_p L4 Input Clock from TI ADC

clk_lvds_rx_n M4

lvds_rx_port0_p[4] AA1

Input TI ADC Channel 1 Data

lvds_rx_port0_n[4] Y2

lvds_rx_port0_p[5] T4

lvds_rx_port0_n[5] T5

lvds_rx_port0_p[6] U1

lvds_rx_port0_n[6] U2

lvds_rx_port0_p[7] N3

lvds_rx_port0_n[7] P3

lvds_rx_port0_p[9] L3

lvds_rx_port0_n[9] L2

lvds_rx_port0_p[10] N4

lvds_rx_port0_n[10] P4

lvds_rx_port0_p[11] N5

lvds_rx_port0_n[11] P6

lvds_rx_port0_p[12] R7

lvds_rx_port0_n[12] T7

clk_spi A20 Input SPI Clock

spi_miso B19 Output SPI Data Out

spi_ss B20 Input SPI Source Select

LED F19 Output ADC Clock Active Status

regbit G18 Output Reserved

TI TSW1405 High-Speed ADC Evaluation Board

HDL User’s Guide

Table 5. Dual Channel Design Signal Names and Pinout

Signal Name LatticeECP3 Pin Direction Definition

reset_n C21 Input Master Reset

clk_lvds_rx_p L4 Input Clock from TI ADC

clk_lvds_rx_n M4

Input TI ADC Channel 1 Data

lvds_rx_port0_p[1] R4

lvds_rx_port0_n[1] T5

lvds_rx_port0_p[2] R3

lvds_rx_port0_n[2] R2

lvds_rx_port0_p[3] B2

lvds_rx_port0_n[3] C2

lvds_rx_port0_p[4] AA1

lvds_rx_port0_n[4] Y2

lvds_rx_port0_p[5] T4

lvds_rx_port0_n[5] T5

lvds_rx_port0_p[6] U1

lvds_rx_port0_n[6] U2

lvds_rx_port0_p[7] N3

lvds_rx_port0_n[7] P3

lvds_rx_port0_p[9] L3

lvds_rx_port0_n[9] L2

lvds_rx_port0_p[10] N4

lvds_rx_port0_n[10] P4

lvds_rx_port0_p[11] N5

lvds_rx_port0_n[11] P6

lvds_rx_port0_p[12] R7

lvds_rx_port0_n[12] T7

lvds_rx_port0_p[13] E5

lvds_rx_port0_n[13] E4

lvds_rx_port0_p[14] P1

lvds_rx_port0_n[14] R1

lvds_rx_port0_p[15] M2

lvds_rx_port0_n[15] M1

clk_spi A20 Input SPI Clock

spi_miso B19 Output SPI Data Out

spi_ss B20 Input SPI Source Select

LED F19 Output ADC Clock Active Status

regbit G18 Output Reserved

TI TSW1405 High-Speed ADC Evaluation Board

HDL User’s Guide

Table 6. Four Channel Design Signal Names and Pinout

Signal Name LatticeECP3 Pin Direction Definition

reset_n C21 Input Master Reset

clk_lvds_rx_p L4 Input Clock from TI ADC

clk_lvds_rx_n M4

Input TI ADC Channel 1 Data

lvds_rx_port0_p[2] R3

lvds_rx_port0_n[2] R2

lvds_rx_port0_p[3] B2

lvds_rx_port0_n[3] C2

lvds_rx_port0_p[4] AA1

lvds_rx_port0_n[4] Y2

lvds_rx_port0_p[5] T4

lvds_rx_port0_n[5] U4

lvds_rx_port0_p[6] U1

lvds_rx_port0_n[6] U2

lvds_rx_port0_p[7] N3

lvds_rx_port0_n[7] P3

lvds_rx_port0_p[10] N4

lvds_rx_port0_n[10] P4

lvds_rx_port0_p[11] N5

lvds_rx_port0_n[11] P6

lvds_rx_port0_p[12] R7

lvds_rx_port0_n[12] T7

lvds_rx_port0_p[13] E5

lvds_rx_port0_n[13] E4

lvds_rx_port0_p[14] P1

lvds_rx_port0_n[14] R1

lvds_rx_port0_p[15] M2

lvds_rx_port0_n[15] M1

lvds_rx_port1_p[0] V4

lvds_rx_port1_n[0] V5

lvds_rx_port1_p[1] V3

lvds_rx_port1_n[1] W3

lvds_rx_port1_p[2] Y3

lvds_rx_port1_n[2] AA2

lvds_rx_port1_p[3] W2

lvds_rx_port1_n[3] Y1

lvds_rx_port1_p[4] V1

lvds_rx_port1_n[4] W1

lvds_rx_port1_p[5] K4

lvds_rx_port1_n[5] K5

lvds_rx_port1_p[6] G3

lvds_rx_port1_n[6] G2

lvds_rx_port1_p[7] J2

lvds_rx_port1_n[7] J1

lvds_rx_port1_p[8] G1

TI TSW1405 High-Speed ADC Evaluation Board

HDL User’s Guide

lvds_rx_port1_n[8] H1

Input TI ADC Channel 1 Data

(cont.)

lvds_rx_port1_p[9] E1

lvds_rx_port1_n[9] F1

lvds_rx_port1_p[10] D2

lvds_rx_port1_n[10] D1

lvds_rx_port1_p[11] B1

lvds_rx_port1_n[11] C1

clk_spi A20 Input SPI Clock

spi_miso B19 Output SPI Data Out

spi_ss B20 Input SPI Source Select

LED F19 Output ADC Clock Active Status

regbit G18 Output Reserved

Table 7. Dual Bus Design Signal Names and Pinout

Signal Name LatticeECP3 Pin Direction Definition

reset_n C21 Input Master Reset

clk_lvds_rx_p L4 Input Clock from TI ADC

clk_lvds_rx_n M4

Input TI ADC Channel 1 Data

lvds_rx_port0_p[3] B2

lvds_rx_port0_n[3] C2

lvds_rx_port0_p[4] AA1

lvds_rx_port0_n[4] Y2

lvds_rx_port0_p[5] T4

lvds_rx_port0_n[5] U4

lvds_rx_port0_p[6] U1

lvds_rx_port0_n[6] U2

lvds_rx_port0_p[7] N3

lvds_rx_port0_n[7] P3

lvds_rx_port0_p[10] N4

lvds_rx_port0_n[10] P4

lvds_rx_port0_p[11] N5

lvds_rx_port0_n[11] P6

lvds_rx_port0_p[12] R7

lvds_rx_port0_n[12] T7

lvds_rx_port0_p[13] E5

lvds_rx_port0_n[13] E4

lvds_rx_port0_p[14] P1

lvds_rx_port0_n[14] R1

lvds_rx_port1_p[0] V4

lvds_rx_port1_n[0] V5

lvds_rx_port1_p[1] V3

lvds_rx_port1_n[1] W3

lvds_rx_port1_p[2] Y3

lvds_rx_port1_n[2] AA2

Table 6. Four Channel Design Signal Names and Pinout (Continued)

Signal Name LatticeECP3 Pin Direction Definition

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