Analog Devices ADSP-21020 manual Fixed-Point, Vector Address Hex Function, IRQ3, IRQ2, IRQ0

ADSP-21020

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

REV. C –11–