AMBE-1000 Digital Voice Systems, Inc., AMBE-1000 Datasheet - Page 25

• Manufacturer Part Number: AMBE-1000
• Manufacturer: Digital Voice Systems, Inc.

3.3.7
CHP_D[7:0]
The AMBE-1000 is not recommended for new designs.
CHP_RDN
CHP_OBE
Please refer to the AMBE-2000/2020 product line.
CHP_OBE returns low when the AMBE-1000
makes another byte available in the registter.
EPR
Expanded Timing for Passive Parallel Mode Output
Figure 3-H shows the timing relationship for a single frame being output from the
AMBE-1000™ in passive parallel mode. When the Encoder Packet Ready (EPR) signal
goes high, this indicates that a coded frame is ready. The controller should then be
prepared to extract the 34 bytes (regardless of bit rate) of data that make up a single
frame over the following 20 milliseconds. See section 4 for the format of this data.
As each byte is extracted, the controller must wait for the CHP_OBE signal to return
low before attempting to extract the next byte.
guarantee at least 350 CLK_I (or CLK_O) cycles between CHP_RDN pulses, then the
CHP_OBE signal can be ignored. The controller should always perform 34 reads for
each frame, even if lower bit rates are being used such that the data at the end of each
frame are unused zeros.
Figure 3-H Expanded Timing for Passive Parallel Mode Output
8 bits
The AMBE-1000 is not recommended for new designs.
Please refer to the AMBE-2000/2020 product line.
High Byte
1
Visit us at www.dvsinc.com
page 25
Low Byte
CLK_I can be guaranteed between CHP_RDN pulses.
CHP_OBE can be ignored if a minimum of 350 clocks of
2
20 Msecs
Alternatively, if the controller can
34