PNX1300 Datasheet, PDF (155/548 Pages) NXP Semiconductors – Media Processors

Philips Semiconductors
Table 9-14. AO highway arbiter latency requirement
examples
TransMode
f_s
(kHz)
T
(ns)
stereo
16 bits/sample
stereo
16 bits/sample
stereo
16 bits/sample
6 channel
16 bits/sample
stereo
32 bits/sample
6 channel
32 bits/sample
44.1
48.0
96.0
48.0
48.0
48.0
22,676
20,833
10,417
20,833
20,833
20,833
max.
arbiter
latency
(ns)
22,656
20,813
10,397
6,924
20,813
6,924
access
pattern
1 request every
362,812 ns
1 request every
333,333 ns
1 request every
166,667 ns
1 request every
111,111 ns
1 request every
166,667 ns
1 request every
55,556 ns
Audio Out
9.14 ERROR BEHAVIOR
In normal operation, the DSPCPU and AO hardware
continuously exchange buffers without ever failing to
transmit a sample. If the DSPCPU fails to provide a new
buffer in time, the UNDERRUN error flag is raised, and
the last valid sample or sample pair is repeated until a
new buffer of data is assigned by an ACK1 or ACK2. The
UNDERRUN flag is not affected by ACK1 or ACK2; it can
only be cleared by an explicit ACK_UDR.
If an HBE error occurs, the last valid sample or sample
pair is repeated until the AO hardware retrieves a new
sample buffer across the highway.
PRELIMINARY SPECIFICATION
9-11