Celsius (°C). The Temperature field shall use the 32-bit format shown in
Table 14
with the
upper 16 bits reserved and shall be set to zero. The Temperature value shall be
expressed in signed two’s-complement format in the lower 16 bits of this field. This field
has an integer and a fractional part, with the radix point to the right of bit 6.
Table 14:
Temperature Field Format
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Reserved
Integer Temperature
Fractional Temp.
The valid range of the Temperature field is -273.15 °C to +511.984375 °C. The resolution
of the Temperature field is 0.015625 °C (1/64 °C).
For examples, a Temperature field value of:
0x0040 repr1 °C,
0xFFC0 represents -1 °C,
0x0001 repr0.015625 °C, and
0xFFFF represents -0.015625 °C.
Digitizer Context Packet Class
This Packet Class is a type of IF Context Packet Class. The packet information conveys
changes in the configuration and status of the RTSA7500's IF digitizer.
Table 15:
Digitizer Context Packet Class Structure
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Pkt Type
0 1 0 0
C
R
T
S
M
TSI TSF Pkt Count
Pkt Size
Stream Identifier (1 word)
Timestamp - Integer Seconds (1 word)
Timestamp - Integer Picoseconds (2 words)
Context Indicator Field (1 word)
Context Section (Variable Size)
14.
Pkt Type
shall be set to
0100
to indicate this is context packet.
15.
C
shall be set to
0
to indicate there is no Class Identifier in the packet.
16.
R
shall be set to
00
, because they are reserved bits.
17.
TSM
shall be set to
0
, indicating that context packet timestamps are precise.
18.
TSI
field shall be set to
01
, indicating that integer (seconds) part of the timestamps are in
UTC.
19.
TSF
field shall be set to
10
, indicating that the fractional part of the timestamp measures
real time picosecond resolution.
20.
Pkt Count
shall start at 0000 and increment once for each context packet, until reaching
1111 (or 15), where it shall rollover to 0000 on the next count.
21.
Pkt Size
indicates the size of the entire context packet, including all headers, the context
indicator field and context sections.
22.
Stream Identifier
shall be the 32-bit word,
0x90000002
.
23.
Timestamp - Integer Seconds
shall be in UTC format and will represent the number of
seconds occurred since Midnight, January 1, 1970 GMT.
