ADSP-2192 Peripheral Device Control Registers
B-16 ADSP-219x/2192 DSP Hardware Reference
4
ACVX
AC’97 External Devices Vaux Powered.
Controls the AC’97 interface during
D3cold
(
RST
asserted).
0 = Disable the interface (drive 0, disable all inputs). This is
used if external AC’97 devices are NOT powered
during d3cold, and protects the ADSP-2192 from
floating inputs and from outputs driving input clamps
on an external device. (default)
1 = Interface enabled during
RST
.
Note: This bit resets to zero.
5
Reserved
Reserved
6
Reserved
Reserved
7
REGD
2.5V Regulator Control Disable.
Disables the on-chip 2.5V Regulator controller when the
2.5V (
IVDD
) supply is derived from an external regulator (e.g.
in USB and Mini-PCI applications).
0 = On-Chip 2.5V Regulator Control Enabled. (default)
1 = On-Chip 2.5V Regulator Control Disabled.
Note: This bit resets to zero.
9:8
CRST<1:0>
Chip Reset Source.
Indicates the source of the last reset to the chip (Read-Only)
00 = Power-On Reset
01 = Reserved.
10 = PCI/ISA/CBUS/USB bus interface hard reset
11 = Soft Reset from the
CMSR:RST
bit
Note: the fifth possible reset source, DIP Soft Reset, is
indicated by
DIP1/2:RD = 1
. Each DSP must check its
DIP<n>:RD
bit and clear it to zero upon reset.
Table B-4. SYSCON Register Bit Descriptions (Continued)
Bit Position
Bit Name
Description