Maxim-integrated MAXQ Family Users Guide: MAXQ2000 Supplement Uživatelský manuál stáhnout pdf (Strana 53)

ADDENDUM TO SECTION 12: HARDWARE MULTIPLIER

The MAXQ2000 provides a hardware multiplier module that provides the following features (detailed in the MAXQ Family User’s Guide).

• Completes a 16-bit x 16-bit multiply-accumulate or multiply-subtract operation in a single cycle

• Includes 48-bit accumulator

• Supports seven different multiplication operations:

Unsigned 16-bit multiply

Unsigned 16-bit multiply and accumulate

Unsigned 16-bit multiply and subtract

Signed 16-bit multiply

Signed 16-bit multiply and negate

Signed 16-bit multiply and accumulate

Signed 16-bit multiply and subtract

The associated registers for this module are listed below.

Multiplier Example: 16-Bit Unsigned Multiplication

move MCNT, #021h ; 0010 0001

; 0 - OF : overflow flag (read only)

; 0 - MCW : write result to MC registers

; 1 - CLD : clears MA/MB/MCx to zero

; 0 - SQU : square function disabled

; 0 - OPCS : start op after writing MA,MB

; 00 - MCNT : MC = MA * MB

; 1 – SUS : unsigned operation

move MA, #01234h ; load first operand

move MB, #00055h ; load second operand, operation starts

move A[2], MC2 ; should be 0000h

move A[1], MC1 ; should be 0006h

move A[0], MC0 ; should be 0B44h

MAXQ Family User’s Guide:

MAXQ2000 Supplement

MCNT M2[00h]

Multiplier Control Register. Controls operation and mode selection for the multiplier.

MA M2[01h]

Multiplier Operand A Register. Input register for multiplier operations.

MB M2[02h]

Multiplier Operand B Register. Input register for multiplier operations.

MC2 M2[03h] Multiplier Accumulate Register 2. Contains bits 32 to 47 of the accumulator.

MC1 M2[04h]

Multiplier Accumulate Register 1. Contains bits 16 to 31 of the accumulator.

MC0 M2[05h]

Multiplier Accumulate Register 0. Contains bits 0 to 15 of the accumulator.

MC1R M2[0Bh]

Multiplier Read Register 1. Contains bits 16 to 31 of the last multiplier operation result.

MC0R M2[0Ch]

Multiplier Read Register 2. Contains bits 0 to 15 of the last multiplier operation result.

Table 19. Hardware Multiplier Control Registers

Maxim Integrated

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 92 93

Komentáře k této Příručce

Žádné komentáře

Maxim-integrated MAXQ Family Users Guide: MAXQ2000 Supplement Uživatelský manuál Strana 53

Komentáře k této Příručce

Související produkty a manuály pro Hardware Maxim-integrated MAXQ Family Users Guide: MAXQ2000 Supplement