6 auto-boot mode, Cdb5460au – Cirrus Logic CDB5460AU User Manual
Page 6
CDB5460AU
6
DS487DBU1
for the 8051 microcontroller (8051_REGIN). Jumper J9 allows the 8051_REGIN supply to be sourced
from either the Vu+_EXT binding post (J6), +5V binding post (J3) or VD+_EXT binding post (J5).
1.6
Auto-boot Mode
With a jumper connection on J18 (AUTO-BOOT ENABLE), the CS5460A operates in auto-boot mode and
the CDB5460AU board operates as a stand-alone system without attaching it to a PC. When in auto-boot
mode, a hardware reset (press on S1) will cause the CS5460A to boot up using the serial data from the
serial EEPROM on the board (U10). When the CS5460A is in auto-boot mode, the SPI™ connections be-
tween the microcontroller and the CS5460A are removed and the GUI software can not access the
CS5460A registers and functions.
Power Supplies
Power Post Connections
VD+
8051-REGIN
Analog (VA+) Digital (VD+) 8051 (Vu+)
+5V
GND
VD+EXT VU+EXT
J8
J9
+5
+5
+5
+5
0
NC
NC
+5
+5
NC
+5
NC
+5
+3.3
+5
+5
0
NC
NC
+5
+3.3
NC
+5
Table 4. Power Supply Connections
O
VD+
O O
VD+
O O
VD+
VD+_EXT
+5
+3.3
(Default)
O
8051
O O
8051
O O
8051
Vu+_EXT
+5
VD+
(Default)
O
VD+
O O
VD+
O O
VD+
VD+_EXT
+5
+3.3
O
8051
O O
8051
O O
8051
Vu+_EXT
+5
VD+
O
VD+
O O
VD+
O O
VD+
VD+_EXT
+5
+3.3
O
8051
O O
8051
O O
8051
Vu+_EXT
+5
VD+
O
VD+
O O
VD+
O O
VD+
VD+_EXT
+5
+3.3
O
8051
O O
8051
O O
8051
Vu+_EXT
+5
VD+
O
VD+
O O
VD+
O O
VD+
VD+_EXT
+5
+3.3
O
8051
O O
8051
O O
8051
Vu+_EXT
+5
VD+
O
VD+
O O
VD+
O O
VD+
VD+_EXT
+5
+3.3
O
8051
O O
8051
O O
8051
Vu+_EXT
+5
VD+
O
VD+
O O
VD+
O O
VD+
VD+_EXT
+5
+3.3
O
8051
O O
8051
O O
8051
Vu+_EXT
+5
VD+
O
VD+
O O
VD+
O O
VD+
VD+_EXT
+5
+3.3
O
8051
O O
8051
O O
8051
Vu+_EXT
+5
VD+
O
VD+
O O
VD+
O O
VD+
VD+_EXT
+5
+3.3
O
8051
O O
8051
O O
8051
Vu+_EXT
+5
VD+