Table 4-6 SYS_ID Register bit assignments (continued)
Bits
Name
Function
[11:8]
Arch
IOFPGA bus architecture:
0x4
AHB.
0x5
AXI.
[7:0]
FPGA
FPGA build in BCD. The actual value
that is read depends on the FPGA
build.
Related concepts
4.3.1 APB system register summary
4.3.3
SYS_SW Register
The SYS_SW Register characteristics are:
Purpose
Reads the
USERSWITCH
entry in the
config.txt
file. A bit set to
0b1
indicates that the switch is
ON.
Usage constraints
Bits[31:8] are read-only. Bits[7:0] are read-write.
Configurations
Available in all V2M-Juno r2 motherboard configurations.
The following figure shows the bit assignments.
31
28
8
0
Reserved
27
7
Soft user switch
30 29
nUART0DSR
nUART0CTS
SW[0]
SW[1]
Figure 4-5 SYS_SW Register bit assignments
The following table shows the bit assignments.
Table 4-7 SYS_SW Register bit assignments
Bits
Name
Function
[31]
SW[1]
Indicates the value of the physical
configuration switch SW[1]:
0b1
ON.
[30]
SW[0]
Indicates the value of the physical
configuration switch SW[0]:
0b1
ON.
[29]
nUART0CTS
UART0 CTS signal.
[28]
nUART0DSR
UART0 DSR signal.
4 Programmers Model
4.3 APB system registers
ARM 100114_0200_03_en
Copyright © 2015–2017 ARM Limited or its affiliates. All rights reserved.
4-91
Non-Confidential