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ISL5216

INSTRUCTION BIT FIELDS (Continued)

BIT

POSITIONS

125:123

FUNCTION

Coefficient Memory

Block-to-Block Step

(ADDRC) Usually set to 0.

125:123

Step size

0

1

2

3

4

5

6

7

127:126

Reserved

Set to 0

0

1

2

4

8

16

32

64

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

0000

0001

0101

1111

1111

100R

RRRR

RRRR

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

127:96

95:64

64:32

31:0

127:96

95:64

63:32

31:0

127:96

95:64

64:32

31:0

00000000h

00000000h

00000000h

00000001h

015FF---h

-----007h

08000A00h

0B00--C8h

00000000h

00000000h

00000000h

00000107h

127:96

95:64

64:32

31:0

00000000h

00000000h

00000000h

00000080h

22

July 8, 2005

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