32

ECP5 Versa Development Board

®

Appendix C. Demo Board Rev A Information

ECP5 Versa Development Board – Working with Revision A

This document covers the Revision B of ECP5 Versa. To work with Revision A there are several items to be aware

of:

Setting the Configuration Mode

On the Rev A, setting the Configuration Mode requires modifying the resistor population in the CFG[2:0] Setting

Resistor Field (see Figure 3) as described in Table 3. This requires adding and/or removing 0603 size SMT resis-

tors as necessary. Some soldering skill and the correct equipment is necessary to perform this rework.

Figure 20. CFG[2:0] Setting Resistor Field – Revision A

Table 14. CFG[2:0] Selection – Revision A

Rev A

Configuration Mode

CFG[2:0]

R190

(1K-4.7 kOhm)

R191

(1K-4.7 kOhm)

R192

(1K-4.7 kOhm)

R182

(0 - 1 kOhm)

R188

(0 - 1 kOhm)

R189

(0 - 1 kOhm)

1149.1 JTAG only

000

removed

removed

removed

placed

placed

placed

Slave SPI

001

removed

removed

placed

placed

placed

removed

Master SPI

010

removed

placed

removed

placed

removed

placed

SCM (Slave_Serial)

101

placed

removed

placed

removed

placed

removed

SCM (Slave_Parallel)

111

placed

placed

placed

removed

removed

removed

ECP5 Pin Assignment Changes

The following pins (Table 15) have changed assignment between the Rev A and Rev B board. These functions

would need to be remapped for use between the two boards.

Table 15. Pin Assignment Updates - Rev A vs Rev B

Pin Signal / Function

Rev A ECP5 Ball Location

Rev B ECP5 Ball Location

SEG1 (Character LED)

L19

L18

Switch 3-7

J19

K19

Phy1_CLK125 (Ethernet Phy 1)

L18

L19

Phy2_RxCLK (Ethernet Phy 2)

K19

J19

1. Removing all six resistors is equivalent to Slave Parallel mode due to internal weak Pull-up resistors on CFG[2:0] pins.