pnx1500 NXP Semiconductors, pnx1500 Datasheet - Page 514

• Manufacturer Part Number: pnx1500
• Description: Pnx15xx Series Connected Media Processor
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Volume 1 of 1
PNX15XX_SER_3
Product data sheet
Figure 3:
SCK
WS
SD
frame
n-1
30 31
Definition of Serial Frame Bit Positions (POLARITY = 1, CLOCK_EDGE = 0)
0
1
2
3
4
CLOCK_EDGE = 0, the parallel-to-serial converter samples WS on a positive clock
edge transition and outputs the first bit (bit 0) of a serial frame on the next falling edge
of SCK.
If CLOCK_EDGE = 1, the parallel-to-serial converter samples WS on the negative
edge of SCK, while audio data is output on the positive edge. That is, the SCK
polarity would be reversed with respect to
Every serial frame transmits a single left and right channel sample and optional
codec control data to each D/A converter. The sample data can be in an LSB first or
MSB first form at an arbitrary serial frame bit position and with an arbitrary length.
(See
In MSB first mode (DATAMODE = 0), the parallel-to-serial converter sends the value
of LEFT[MSB] in bit position LEFTPOS in the serial frame. Subsequently, bits from
decreasing bit positions in the LEFT dataword, up to and including LEFT[SSPOS],
are transmitted in order.
In LSB first mode (DATAMODE = 1), the parallel-to-serial converter sends the value of
LEFT[SSPOS] in bit position LEFTPOS in the serial frame. Subsequent bits from the
LEFT data word, up to and including LEFT[MSB], are transmitted in order. The exact
bits transmitted for a data item ‘S’ are shown in
Table 3: Bits Transmitted for Each Memory Data Item
Frame bits that do not belong to either LEFT[MSB:SSPOS] or RIGHT[MSB:SSPOS]
or a codec control field
extension ensures that Audio Out can be used in combination with D/A converters
which expect more bits than the actual number of transmitted bits in the current
operating mode (e.g., 18-bit D/As operating with 16-bit memory data).
If a starting position for a field is defined at a position such that the end of a serial
frame is reached before the end of the data field is reached, the data beyond the last
bit of the serial frame is truncated.
Operating Mode
16 bit/sample, MSB first
16 bit/sample, LSB first
32 bit/sample, MSB first
32 bit/sample, LSB first
5
6
Section
7
8
9
10 11
4..)
12
Rev. 3 — 17 March 2006
13 14 15
(Section 2.7 on page
16
First Bit
S[15]
S[SSPOS]
S[31]
S[SSPOS]
frame
17
18 19
n
20 21
22 23 24
Figure
Last Bit
S[SSPOS]
S[15]
S[SSPOS]
S[31]
15-9) are shifted out as zero. This zero
25
Table
3.
26
27
3.
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
28 29
PNX15xx Series
Chapter 15: Audio Output
30
Valid SSPOS Values
0...15
0...15
0...31
0...31
31
0
1
frame
2
3
n+1
4
5
6
7
15-7