1 .. SPDX-License-Identifier: GFDL-1.1-no-invari 1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
2 2
3 .. _V4L2-SDR-FMT-PCU20BE: 3 .. _V4L2-SDR-FMT-PCU20BE:
4 4
5 ****************************** 5 ******************************
6 V4L2_SDR_FMT_PCU20BE ('PC20') 6 V4L2_SDR_FMT_PCU20BE ('PC20')
7 ****************************** 7 ******************************
8 8
9 Planar complex unsigned 20-bit big endian IQ s 9 Planar complex unsigned 20-bit big endian IQ sample
10 10
11 Description 11 Description
12 =========== 12 ===========
13 13
14 This format contains a sequence of complex num 14 This format contains a sequence of complex number samples. Each complex
15 number consist of two parts called In-phase an 15 number consist of two parts called In-phase and Quadrature (IQ). Both I
16 and Q are represented as a 20 bit unsigned big 16 and Q are represented as a 20 bit unsigned big endian number stored in
17 32 bit space. The remaining unused bits within 17 32 bit space. The remaining unused bits within the 32 bit space will be
18 padded with 0. I value starts first and Q valu 18 padded with 0. I value starts first and Q value starts at an offset
19 equalling half of the buffer size (i.e.) offse 19 equalling half of the buffer size (i.e.) offset = buffersize/2. Out of
20 the 20 bits, bit 19:2 (18 bit) is data and bit 20 the 20 bits, bit 19:2 (18 bit) is data and bit 1:0 (2 bit) can be any
21 value. 21 value.
22 22
23 **Byte Order.** 23 **Byte Order.**
24 Each cell is one byte. 24 Each cell is one byte.
25 25
26 .. flat-table:: 26 .. flat-table::
27 :header-rows: 1 27 :header-rows: 1
28 :stub-columns: 0 28 :stub-columns: 0
29 29
30 * - Offset: 30 * - Offset:
31 - Byte B0 31 - Byte B0
32 - Byte B1 32 - Byte B1
33 - Byte B2 33 - Byte B2
34 - Byte B3 34 - Byte B3
35 * - start + 0: 35 * - start + 0:
36 - I'\ :sub:`0[19:12]` 36 - I'\ :sub:`0[19:12]`
37 - I'\ :sub:`0[11:4]` 37 - I'\ :sub:`0[11:4]`
38 - I'\ :sub:`0[3:0]; B2[3:0]=pad` 38 - I'\ :sub:`0[3:0]; B2[3:0]=pad`
39 - pad 39 - pad
40 * - start + 4: 40 * - start + 4:
41 - I'\ :sub:`1[19:12]` 41 - I'\ :sub:`1[19:12]`
42 - I'\ :sub:`1[11:4]` 42 - I'\ :sub:`1[11:4]`
43 - I'\ :sub:`1[3:0]; B2[3:0]=pad` 43 - I'\ :sub:`1[3:0]; B2[3:0]=pad`
44 - pad 44 - pad
45 * - ... 45 * - ...
46 * - start + offset: 46 * - start + offset:
47 - Q'\ :sub:`0[19:12]` 47 - Q'\ :sub:`0[19:12]`
48 - Q'\ :sub:`0[11:4]` 48 - Q'\ :sub:`0[11:4]`
49 - Q'\ :sub:`0[3:0]; B2[3:0]=pad` 49 - Q'\ :sub:`0[3:0]; B2[3:0]=pad`
50 - pad 50 - pad
51 * - start + offset + 4: 51 * - start + offset + 4:
52 - Q'\ :sub:`1[19:12]` 52 - Q'\ :sub:`1[19:12]`
53 - Q'\ :sub:`1[11:4]` 53 - Q'\ :sub:`1[11:4]`
54 - Q'\ :sub:`1[3:0]; B2[3:0]=pad` 54 - Q'\ :sub:`1[3:0]; B2[3:0]=pad`
55 - pad 55 - pad
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