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ISL5239
TABLE 7. CONTROL
TYPE: CAPTURE MEMORY, ADDRESS: 0x04
BIT
15:14
13
12
11:9
8
7
6
5:4
3
2:1
0
BIT
15:11
10:0
FUNCTION
Reserved
Address Auto Increment
Memory Select
Reserved
Feedback Input Format
Reserved
Processor Trigger
Trigger Select
Reserved
Input Memory Data in
Source
CM Soft Reset
FUNCTION
Reserved
Input Length
DESCRIPTION
Not used.
When set high, automatically increments the memory address after any access operation (read or write).
Selects the memory for access.
0 - Input memory (default).
1 - Feedback memory.
Not used.
Selects the feedback input format.
0 - Parallel (default) uses FB<19:0> as a 20-bit parallel input.
1 - Serial uses FB<0> as the input data bit and FB<1> as the serial sync, sampled at the rising edge of
FBCLK.
Not used.
When high, enables the trigger. Low (default) is trigger disabled.
Selects the trigger mode.
00 - Processor trigger used (default).
01 - Magnitude trigger when min threshold <= magnitude <= maximum threshold.
10 - External trigger.
Not used.
Select the input memory dataIn Source.
00 - Interpolator output (default).
01 - Pre-distortion Output.
10 - Pre-distortion Magnitude.
When high, resets all the configuration memory circuitry except the control fields. Low is default.
TABLE 8. LENGTH OF INPUT MEMORY LOOP
TYPE: CAPTURE MEMORY, ADDRESS: 0x05
DESCRIPTION
Not Used
Length of the input memory loop. Specified from 2 0 (1) to 2 11 (2047). Default = 0. Resets the input
memory address to 0 when input length reached. Actual loop length is this value + 2.
TABLE 9. INPUT MEMORY CAPTURE MODE AND TRIGGER DELAY
TYPE: CAPTURE MEMORY, ADDRESS: 0x06
BIT
15
14:0
FUNCTION
Input Memory Capture
Mode
Input Trigger Delay
Counter
DESCRIPTION
Selects the active capture mode when the input capture memory is running. Identical to feedback capture
mode except applies to the input memory.
0 - Delay. (default) Defines the beginning of the 2k sample capture window as the trigger point plus the
input trigger delay counter samples.
1 - Advance. Defines the end of the 2k-sample capture window as the trigger point plus the input trigger
delay counter samples.
See control word 0x07, bit 1:0 for mode selection.
Offset delay that defines the input memory capture window when control word 0x07, bits 1:0 = 01
(Capture mode).
When control word 0x06, bit 15 is set to 0, delay mode, values selectable from 2 0 to 2 15 (0...32768).
When control word 0x06, bit 15 is set to 1, advance mode, value selectable from 2 0 to 2 11 (0...2047).
22
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