ISL5216
INSTRUCTION BIT FIELDS (Continued)
BIT
POSITIONS
125:123
127:126
FUNCTION
Coefficient Memory
Block-to-Block Step
Reserved
(ADDRC) Usually set to 0.
125:123 Step size
0
0
1
1
2
2
3
4
4
8
5
16
6
32
7
64
Set to 0
DESCRIPTION
Basic Instruction Set Examples
1. Wait for number of input samples > threshold
127:9 = 0
8:0 = 001
0000,0000,0000,0001h
2. Jump unconditional
127:9 = 0
8:0 = 1JJJJJ111b
example: jump to step 0= 0000,0000,0000,0107h
3. Jump RSCO (jump on resampler NCO carry output)
127:9 = 0
8:0 = 1JJJJJ101b
example: jump RSCO, step 0= 0000,0000,0000,0105h
4. Jump RSCO (jump on no resampler NCO carry output)
127:9 = 0
8:0 = 1JJJJJ100b
example: jump RSCO, step 0 = 0000,0000,0000,0104h
5. NOP single clock
127:9 = 0
8:0 = 010000000b
NOP1 = 0000,0000,0000,0080h
6. Load Loop Counter
127:21 = 0
20:9 = Loop counter preload (tested against 0)
8:0 = 010000100b
example: LdLpCntr 14 = 0000,0000,0000,1C84h
Single FIR Basic Program
This is the basic program for a single FIR. This program
applies to decimation filters (including DECx1) that are
symmetric or asymmetric (but not complex). The FIR output
is routed through path A with the AGC enabled.
0 - WAIT FOR ENOUGH SAMPLES
0000 0000 0000 0000 0000 0000 0000 0000
0000 0000 0000 0000 0000 0000 0000 0000
0000 0000 0000 0000 0000 0000 0000 0000
0000 0000 0000 0000 0000 0000 0000 0001
1 - FIR
127:96
95:64
64:32
31:0
00000000h
00000000h
00000000h
00000001h
0000 0001 0101
1111 1111
100R RRRR RRRR
127:96
015FF---h
00TT TTTT TTTD DDDD DDDD 0000 0000 0111
0000 1000 0000 0000 0000 1010 0000 0000
0000 1011 0000 0000 0FFF FFF0 1100 1000
2 - JUMP TO STEP 0
0000 0000 0000 0000 0000 0000 0000 0000
0000 0000 0000 0000 0000 0000 0000 0000
0000 0000 0000 0000 0000 0000 0000 0000
0000 0000 0000 0000 0000 0001 0000 0111
Four bit fields must be filled in:
F - filter type (this example applies to types 1-5)
D - decimation (also loaded into wait threshold)
T - number of taps minus 1
R - clocks/calculation (=floor((taps+1)/2) for symmetric, = taps for asymmetric)
The rest of the instruction RAM would typically be filled with NOP instructions:
0000 0000 0000 0000 0000 0000 0000 0000
0000 0000 0000 0000 0000 0000 0000 0000
0000 0000 0000 0000 0000 0000 0000 0000
0000 0000 0000 0000 0000 0000 1000 0000
22
95:64
63:32
31:0
127:96
95:64
64:32
31:0
127:96
95:64
64:32
31:0
-----007h
08000A00h
0B00--C8h
00000000h
00000000h
00000000h
00000107h
00000000h
00000000h
00000000h
00000080h
FN6013.3
July 13, 2007
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