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Enhanced Queued Analog-to-Digital Converter (eQADC)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
19-59
19.4.2
Command/Result Queues
The command and result queues are actually part of the eQADC system although they are not hardware
implemented inside the eQADC. Instead command and result queues are user-defined queues located in
system memory. Each command queue entry is a 32-bit command message.The last entry of a command
queue has the EOQ bit asserted to indicate that it is the last entry of the queue. The result queue entry is a
16-bit data item.
Section 19.1.4, “Modes of Operation
,”
for a description of the message formats and their flow in
eQADC.
Refer to
Section 19.5.5, “Command Queue and Result Queue Usage
,” for examples of how command
queues and result queues can be used.
19.4.3
eQADC Command FIFOs
19.4.3.1
CFIFO Basic Functionality
There are six prioritized CFIFOs located in the eQADC. Each CFIFO is four entries deep, and each CFIFO
entry is 32 bits long. A CFIFO serves as a temporary storage location for the command messages stored
in the command queues in system memory. When a CFIFO is not full, the eQADC sets the corresponding
CFFF bit in
Section 19.3.2.8, “eQADC FIFO and Interrupt Status Registers 0–5 (EQADC_FISRn)
.” If
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Reserved
MESSAGE_TAG
(0b1000)
BUSY1
BUSY0
RFIFO Header
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
DETERMINED BY THE EXTERNAL DEVICE
ADC Result
Figure 19-34. Null Message Receive Format for External Device Operation
Table 19-43. Null Message Receive Format for External Device Operation
Field
Description
6–7
Reserved.
8–11
MESSAGE_
TAG[0:3]
MESSAGE_TAG field. Refer to
Section , “Conversion Command Message Format for On-Chip ADC Operation
.”
12–15
BUSY
n
[0:1]
BUSY status. Refer to
Section , “Result Message Format for External Device Operation
.”
16–31
Determined by the external device.
Содержание MPC5566
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