Analog Devices ADSP-21020 Specification Sheet page 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
REV. C
Table VIII. Interrupt Vector Addresses and Priorities
Vector
Address
No. (Hex)
0 0x00
1* 0x08
2 0xl0
3 0xl8
4 0x20
5 0x28
6 0x30
7 0x38
8 0x40
9 0x48
10 0x50
11 0x58
12 0x60
13 0x68
14 0x70
15 0x78
16 0x80
17 0x88
18 0x90
19–23 0x98-0xB8
24–31 0xC0–OxF8
*Nonmaskable
–11–
ADSP-21020
Function
Reserved
Reset
Reserved
Status stack or loop stack overflow or
PC stack full
Timer=0 (high priority option)
IRQ3 asserted
IRQ2 asserted
IRQ1 asserted
IRQ0 asserted
Reserved
Reserved
DAG 1 circular buffer 7 overflow
DAG 2 circular buffer 15 overflow
Reserved
Timer=0 (low priority option)
Fixed-point overflow
Floating-point overflow
Floating-point underflow
Floating-point invalid operation
Reserved
User software interrupts