AD1846 Analog Devices, AD1846 Datasheet - Page 19

• Manufacturer Part Number: AD1846
• Description: Low Cost Parallel-port 16-bit Soundport Stereo Codec
• Manufacturer: Analog Devices

REV. A
ORL1:0 Overrange Left Detect. These bits indicate the overrange on the left input channel. This bit changes on a sample-by-
ORR1:0 Overrange Right Detect. These bits indicate the overrange on the right input channel. This bit changes on a sample-by-
DRS
ACI
PUR
COR
The occurrence of a PUR and/or COR is designated in the Status Register’s Sample Overrun/Underrun (SOUR) bit. The SOUR bit
is the logical OR of the COR and PUR bits. This enables a polling host CPU to detect an overrun/underrun condition while checking
other status bits.
This register’s initial state after reset is “0000 0000.”
res
ID3:0
This register’s initial state after reset is “xxxx RRRR” where RRRR = Revision ID of the silicon in use.
Test and Initialization Register (IXA3:0 = 11)
Miscellaneous Control Register (IXA3:0 = 12)
IXA3:0
IXA3:0
11
12
sample basis. This bit is read only.
0
1
2
3
sample basis. This bit is read only.
0
1
2
3
Data Request Status. This bit indicates the current status of the PDRQ and CDRQ pins of the AD1846.
0
1
Autocalibrate-In-Progress. This bit indicates the state of autocalibration or a recent exit from Mode Change Enable
(MCE). This bit is read only.
0
1
Playback Underrun. This bit is set when playback data has not arrived from the host in time to be played. As a result, a
midscale value will be sent to the DACs. This bit changes on a sample by sample basis.
Capture Overrun. This bit is set when the capture data has not been read by the host before the next sample arrives. The
sample being read will not be overwritten by the new sample. The new sample will be ignored. This bit changes on a
sample by sample basis.
Reserved for future expansion. The bits are read only. Do not write to these bits.
AD1846 Revision ID. These four bits define the revision level of the AD1846. The AD1846 is designated
ID = “1010.” Revisions increment by one LSB. These bits are read only.
Less than –1 dB underrange
Between –1 dB and 0 dB underrange
Between 0 dB and +1 dB overrange
Greater than +1 dB overrange
Less than –1 dB underrange
Between –1 dB and 0 dB underrange
Between 0 dB and +1 dB overrange
Greater than +1 dB overrange
CDRQ and PDRQ are presently inactive (LO)
CDRQ or PDRQ are presently active (HI)
Autocalibration is not in progress
Autocalibration is in progress or MCE was exited within approximately the last 128 sample periods
Data 7
Data 7
COR
res
Data 6
Data 6
PUR
res
Data 5
Data 5
ACI
res
Data 4
Data 4
DRS
–19–
res
Data 3
Data 3
ORR1
ID3
Data 2
Data 2
ORR0
ID2
Data 1
Data 1
ORL1
ID1
AD1846
Data 0
Data 0
ORL0
ID0