Analog Devices ADSP-21020 User Manual
Page 11
ADSP-21020
REV. C
–11–
Table Vll. Multifunction Compute Operations
Fixed-Point
Rm=R3-0 * R7-4 (SSFR), Ra=R11-8 + R15-12
Rm=R3-0 * R7-4 (SSFR), Ra=R11-8 – R15-12
Rm=R3-0 * R7-4 (SSFR), Ra=(R11-8 + R15-12)/2
MRF=MRF + R3-0 * R7-4 (SSF), Ra=R11-8 + R15-12
MRF=MRF + R3-0 * R7-4 (SSF), Ra=R11-8 – R15-12
MRF=MRF + R3-0 * R7-4 (SSF), Ra=(R11-8 + R15-12)/2
Rm=MRF + R3-0 * R7-4 (SSFR), Ra=R11-8 + R15-12
Rm=MRF + R3-0 * R7-4 (SSFR), Ra=R11-8 – R15-12
Rm=MRF + R3-0 * R7-4 (SSFR), Ra=(R11-8 + R15-12)/2
MRF=MRF – R3-0 * R7-4 (SSF), Ra=R11-8 + R15-12
MRF=MRF – R3-0 * R7-4 (SSF), Ra=R11-8 – R15-12
MRF=MRF – R3-0 * R7-4 (SSF), Ra=(R11-8 + R15-12)/2
Rm=MRF – R3-0 * R7-4 (SSFR), Ra=R11-8 + R15-12
Rm=MRF – R3-0 * R7-4 (SSFR), Ra=R11-8 – R15-12
Rm=MRF – R3-0 * R7-4 (SSFR), Ra=(R11-8 + R15-12)/2
Rm=R3-0 * R7-4 (SSFR), Ra=R11-8 + R15-12,
Rs=R11-8 – R15-12
Floating-Point
Fm=F3-0 * F7-4, Fa=F11-8 + F15-12
Fm=F3-0 * F7-4, Fa=F11-8 – F15-12
Fm=F3-0 * F7-4, Fa=FLOAT R11-8 by R15-12
Fm=F3-0 * F7-4, Fa=FIX R11-8 by R15-12
Fm=F3-0 * F7-4, Fa=(F11-8 + F15-12)/2
Fm=F3-0 * F7-4, Fa=ABS F11-8
Fm=F3-0 * F7-4, Fa=MAX (F11-8, F15-12)
Fm=F3-0 * F7-4, Fa=MIN (F11-8, F15-12)
Fm=F3-0 * F7-4, Fa=F11-8 + F15-12,
Fs=F11-8 – F15-12
Ra, Rm
Any register file location (fixed-point)
R3-0
R3, R2, R1, R0
R7-4
R7, R6, R5, R4
R11-8
R11, R10, R9, R8
R15-12
R15, R14, R13, R12
Fa, Fm
Any register file location (floating-point)
F3-0
F3, F2, F1, F0
F7-4
F7, F6, F5, F4
F11-8
F11, F10, F9, F8
F15-12
F15, F14, F13, F12
(SSF)
X-input signed, Y-input signed, fractional inputs
(SSFR)
X-input signed, Y-input signed, fractional inputs, rounded output
Table VIII. Interrupt Vector Addresses and Priorities
Vector
Address
No.
(Hex)
Function
0
0x00
Reserved
1*
0x08
Reset
2
0xl0
Reserved
3
0xl8
Status stack or loop stack overflow or
PC stack full
4
0x20
Timer=0 (high priority option)
5
0x28
IRQ3
asserted
6
0x30
IRQ2
asserted
7
0x38
IRQ1
asserted
8
0x40
IRQ0
asserted
9
0x48
Reserved
10
0x50
Reserved
11
0x58
DAG 1 circular buffer 7 overflow
12
0x60
DAG 2 circular buffer 15 overflow
13
0x68
Reserved
14
0x70
Timer=0 (low priority option)
15
0x78
Fixed-point overflow
16
0x80
Floating-point overflow
17
0x88
Floating-point underflow
18
0x90
Floating-point invalid operation
19–23
0x98-0xB8
Reserved
24–31
0xC0–OxF8
User software interrupts
*Nonmaskable