Table 4-125 N1 SDP APB system register summary (continued)
Offset
Name
Type
Reset
Width Description
0x0084
SYS_PROC_ID0
RW
0x0X000000
32
See
.
0x0120
SYS_FAN_SPEED
RW
0x00000000
32
See
.
4.6.2
SYS_ID Register
The SYS_ID Register characteristics are:
Purpose
Contains information about the N1 SDP and the bus and image versions inside the IOFPGA.
Usage constraints
The SYS_ID Register is read
‑
only.
Configurations
Available in all N1 board configurations.
Memory offset and full register reset value
See
4.6.1 APB system register summary
The following table shows the bit assignments.
Table 4-126 SYS_ID Register bit assignments
Bits
Name
Type
Function
[31:28] Rev
RO
Board revision:
0x0
: Rev A board. This is the prototype board
and contains the N1 SoC.
[26:16] HBI
RO
HBI board number in BCD:
0x316
: HBI0316.
[15:12] Build
RO
Build variant of board:
0xF
: All builds.
[11:8]
Arch
RO
IOFPGA bus architecture:
0x4
: AHB.
0x5
: AXI.
[7:0]
FPGA
RO
FPGA build in BCD. The actual value that is
read depends on the FPGA build.
4.6.3
SYS_SW Register
The SYS_SW Register characteristics are:
Purpose
Stores the 8 user DIP switches on the N1 board. A bit set to
0b1
indicates that the switch is ON.
Usage constraints
Bits[29:28] are read
‑
only. Bits[7:0] are read/write.
4 Programmers model
4.6 APB system registers
101489_0000_02_en
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