System Status Register - Digi NS7520B-1-C36 Hardware Reference Manual

G E N m o d u l e r e g i s t e r s

System Status register

Address: FFB0 0004
All bits in the System Status register, except EXT, WDOG, PLL, and SOFT, are loaded
during a hardware reset only. EXT, WDOG, PLL, and SOFT are loaded during any
reset. The GEN_ID value is not affected when an external jumper is changed, unless a
hardware reset is executed first.
31 30
15 14
Register bit assignment
Bits
D31:24
D23
Table 25: System Status register bit definition
6 8
29 28 27 26
REV
13 12 11 10
Reserved
Access Mnemonic Reset
R/O REV 'h29
R/C EXT N/A
N S 7 5 2 0 H a r d w a r e R e f e r e n c e , R e v G 9 / 2 0 0 7
25 24 23 22 21
EXT WDOG PLL
9 8 7 6 5
GEN_ID
Description
NS7520 revision ID
Provides hardware identification of the NS7520 and its
revision.
Current NS7520 device and revision ID is:
REV field:
'h29
Last reset caused by external reset
When set to 1, indicates that the RESET_ pin triggered the
last hardware reset condition. This reset initializes internal
parameters as described in "NS7520 bootstrap
initialization" on page 59.
EXT is set/reset during every reset condition. Clear this bit
by writing in bits 23:20.
'hF
20 19 18 17 16
SOFT Reserved
4 3 2 1 0