Microsemi SmartFusion2, RTG4, IGLOO2 User Manual

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SmartFusion2, IGLOO2, and RTG4

Hard Multiplier Accumulator Configuration

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SmartFusion2, IGLOO2, and RTG4 Hard Multiplier Accumulator Configuration

Table of Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1 SmartDesign. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Core Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Port Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

A Product Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Customer Technical Support Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Website . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Contacting the Customer Technical Support Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

ITAR Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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Introduction

The Hard Multiplier Accumulator for SmartFusion2, IGLOO2, and RTG4 supports normal (Figure 1) and dot product (Figure 2) multiplication. Blue registers indicate control signals; brown registers are for data.

Figure 1 • Normal Multiplier Accumulator

Figure 2 • Dot Product Multiplier Accumulator

Key Features

The Hard Multiplier Accumulator supports two operating modes: Normal and Dot Product.

• A structural netlist is generated in either Verilog or VHDL

• Individual inputs and outputs can be optionally registered with: – A common rising edge clock – Independent active-low asynchronous and synchronous clear controls – Independent active-high enable controls

• An additional cascade output CDOUT can be enabled. This is the sign-extended 44 bit copy of output P

• An additional Carry In input can be enabled

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• An additional Carry Out or Overflow output can be enabled.

• Normal Mode Features: – Configurable operand widths for A0 and B0 between 2 and 18 – Configurable operand width for C between 2 and 44 – Optional as signment of operand A0 to an 18 bit two's complement constant – Optional assignment of operand C to a 44 bit two’s complement constant – Option to select between Multiplier followed by Adder, Subtractor or dynamic AddSub – Optional Arithmetic Right Shift by 17 bits of the feedback input

• Dot Product Mode Features: – Configurable operand widths for A0, B0, A1, B1 between 2 and 9. – Configurable operand width for C between 2 and 35. – Optional assignment of operand A0 and A1 to a 9 bit two's complement constant – Optional assignment of Operand C to a 35 bit two’s complement constant

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1 – SmartDesign

The Hard Multiplier Accumulator for SmartFusion2, IGLOO2, and RTG4 is available for download from the Libero® SoC IP Catalog via the web repository. Once listed in the Catalog you can double-click the macro to configure it in SmartDesign. For information on using SmartDesign to configure, connect, and generate cores, see the Libero SoC online help.

Figure 1-1 • Hard Multiplier Accumulator Configuration Options - Normal Mode

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Figure 1-2 • Hard Multiplier Accumulator Configuration Options - Dot Product Mode

After configuring and generating the macro instance, you can simulate basic functionality. The macro can then be instantiated as a component of a larger design.

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2 – Core Parameters

Table 2-1 lists the Normal mode Hard Multiplier Accumulator settings; Table 2-2 lists the Dot Product

mode settings.

Table 2-1 • Hard Multiplier Accumulator Normal Mode Configuration Description

Name Valid Range Description Multiplier Functions

Function Multiplier

Accumulator (Adder)

Multiplier Accumulator (Subtractor)

Multiplier Accumulator (Adder/Subtractor)

Input Port A0

Use Constant Sets input port A0 to constant

Constant Value (Hex) -2

Width 2 to 18 Width of input port A0; if shorter than 18 bits it is sign-extended. For

Input Port B0

Width 2 to 18 Width of input port B0; if shorter than 18 bits it is sign-extended. For

to (217 - 1) Two's complement value of A0, if A0 is constant. Values shorter than

The Multiplier Accumulator with Adder/Subtractor exposes the SUB control signal, which enables you to dynamically toggle between an add or subtract operation.

18 bits are padded with zeros. Negative values must be a full 18 bits wide. For example, 0x1FFFF means +131071 (2 means -1

example, if the width is 8, a value of 0x7F means +127 and a value of 0xFF means -1

example, if the width is 8, a value of 0x7F means +127 and a value of 0xFF means -1.

- 1), while 0x3FFFF

Input Port C

Use Constant Sets input port C to constant

Constant Value (Hex) -2

Width 2 to 44 Width of input port C; if shorter than 44 bits it is sign-extended. For

Carry In Carry in for C (if C is not set to constant)

to (243 - 1) Two's complement value of C, if C is constant. Values shorter than 44

bits are padded with zeros. Negative values must be a full 44 bits wide.

example, If the width is 8, a value of 0x7F means +127 and a value of 0xFF means -1.

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Table 2-1 • Hard Multiplier Accumulator Normal Mode Configuration Description (continued)

Name Valid Range Description

Input Port ARSHFT17

Right Shift of

Feedback input is arithmetic right-shifted by 17 if selected

Feedback Input Register Port Registers ARSHFT17 control signal

Input Port SUB

Adder/Subtractor option is selected

Output Port P

Select the output port function to include in the module interface

CarryOut

Table 2-2 • Hard Multiplier Accumulator Dot Product Mode Configuration Description

Name Valid Range Description Input Port A0

Use Constant Sets input port A0 to constant Constant Value (Hex) -28 to (28 - 1) Two's complement value of A0, if A0 is constant. Values shorter than 9

bits are padded with zeros. Negative values must be a full 9 bits wide. For example, 0xFF means +255 (2

- 1), while 0x1FF means -1

Width 2 to 9 Width of input port A0; if shorter than 9 bits it is sign-extended. For

example, if the width is 8, a value of 0x7F means +127 and a value of 0xFF means -1.

Input Port A1

Use Constant Sets input port A1 to constant

Constant Value (Hex) -2

to (28 - 1) Two's complement value of A1, if A1 is constant. Values shorter than 9

bits are padded with zeros. Negative values must be a full 9 bits wide. For example, 0xFF means +255 (2

- 1), while 0x1FF means -1

Width 2 to 9 Width of input port A1; if shorter than 9 bits it is sign-extended. For

example, if the width is 8, a value of 0x7F means +127 and a value of 0xFF means -1.

Input Port B0

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Table 2-2 • Hard Multiplier Accumulator Dot Product Mode Configuration Description

Name Valid Range Description

Width 2 to 9 Width of input port B0; if shorter than 9 bits it is sign-extended. For

example, if the width is 8, a value of 0x7F means +127 and a value of 0xFF means -1.

Input Port B1

Width 2 to 9 Width of input port B1; if shorter than 9 bits it is sign-extended. For

example, if the width is 8, a value of 0x7F means +127 and a value of 0xFF means -1.

Input Port C

Use Constant Sets input port C to constant

Constant Value (Hex) -2

to (235 - 1) Two's complement value of C, if C is constant. Values shorter than 35

bits are padded with zeros. Negative values must be a full 35 bits wide.

Width 2 to 35 Width of input port C; if shorter than 35 bits it is sign-extended. For

example, if the width is 8, a value of 0x7F means +127 and a value of

0xFF means -1. Carry In Carry in for C (if C is not set to constant) Register Port Registers input port C and Carry In (if C is not set to constant)

Output Port P

Select the output port function to include in the module interface

CarryOut

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3 – Port Description

The figures below display the Hard Multiplier Accumulator input and output ports for Normal mode (Figure 3-1) and Dot Product mode (Figure 3-2). Only a subset of the ports is used in any given Hard Multiplier Accumulator configuration.

Figure 3-1 • Hard Multiplier Accumulator Ports, Normal Mode

Figure 3-2 • Hard Multiplier Accumulator Ports, Dot Product Mode

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Table 3-1 lists the Hard Multiplier Accumulator port signals fo r Normal mode.

Table 3-1 • Hard Multiplier Accumulator Ports - Normal Mode

Signal Direction Description

A0 Input Input data A0, 2- 18 bits wide B0 Input Input data B0, 2- 18 bits wide C Input Input data C, 2- 44 bits wide CLK Input Input clock for all registers A0_ACLR_N Input Asynchronous reset for data A0 registers A0_SCLR_N Input Synchronous reset for data A0 registers A0_EN Input Enable for data A0 registers B0_ACLR_N Input Asynchronous reset for data B0 registers B0_SCLR_N Input Synchronous reset for data B0 registers B0_EN Input Enable for data B0 registers C_ACLR_N Input Asynchronous reset for data C, Carry In registers C_SCLR_N Input Synchronous reset for data C, Carry In registers C_EN Input Enable for data C, Carry In registers CARRYIN Input Carry In input for operand C ARSHFT17_ACLR_N Input Asynchronous reset for ARSHF T17 register ARSHFT17_SCLR_N Input Synchronous reset for ARSHF T17 register ARSHFT17_EN Input Enable for ARSHFT17 register SUB_ACLR_N Input Asynchronous reset for input control SUB registers SUB_SCLR_N Input Synchronous reset for input control SUB registers SUB_EN Input Enable for input control SUB registers SUB Input Input control signal to select between add or subtract operation P_ACLR_N Input Asynchronous reset for result P, CDOUT, Overflow/Carryout registers P_SCLR_N Input Synchronous reset for result P, CDOUT, Overflow/Carryout registers P_EN Input Enable for result P, CDOUT, Overflow/Carryout registers P Output Pn = Pn-1 + CARRYIN + C + (A0 * B0) when SUB = 0

Pn = Pn-1 + CARRYIN + C - (A0 * B0) when SUB = 1

OVERFLOW Output When high, indicates that the result exceeded the width of output P.

OVERFLOW = (P[45] ^ P[44]) | (P[44] ^ P[43])

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Table 3-1 • Hard Multiplier Accumulator Ports - Normal Mode (continued)

Signal Direction Description

CARRYOUT Output This bit can be used to extend the adder in the fabric.

CARRYOUT = C[43] ^ D[43] ^ P[44]

CDOUT Output

Cascade

Cascade output of result P. CDOUT is a copy of P, sign-extended to 44 bits. The entire bus must either be dangling or drive an entire CDIN of another MATH block in Normal mode.

Table 3-2 lists the Hard Multiplier Accumulator port signals fo r Dot Product mode.

Table 3-2 • Hard Multiplier Accumulator Ports - Dot Product Mode

Signal Direction Description

A0 Input Input data A0, 2- 9 bits wide B0 Input Input data B0, 2- 9 bits wide A1 Input Input data A1, 2- 9 bits wide B1 Input Input data B1, 2- 9 bits wide C Input Input data C, 2- 35 bits wide CLK Input Input clock for all registers A0_ACLR_N Input Asynchronous reset for data A0 registers A0_SCLR_N Input Synchronous reset for data A0 registers A0_EN Input Enable for data A0 registers B0_ACLR_N Input Asynchronous reset for data B0 registers B0_SCLR_N Input Synchronous reset for data B0 registers B0_EN Input Enable for data B0 registers A1_ACLR_N Input Asynchronous reset for data A1 registers A1_SCLR_N Input Synchronous reset for data A1 registers A1_EN Input Enable for data A1 registers B1_ACLR_N Input Asynchronous reset for data B1 registers B1_SCLR_N Input Synchronous reset for data B1 registers B1_EN Input Enable for data B1 registers C_ACLR_N Input Asynchronous reset for data C, Carry In registers C_SCLR_N Input Synchronous reset for data C, Carry In registers C_EN Input Enable for data C, Carry In registers CARRYIN Input Carry In input for operand C P_ACLR_N Input Asynchronous reset for result P, CDOUT, Overflow/Carryout registers

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Table 3-2 • Hard Multiplier Accumulator Ports - Dot Product Mode (continued)

Signal Direction Description

P_SCLR_N Input Synchronous reset for result P, CDOUT, Overflow/Carryo ut registe r s P_EN Input Enable for result P, CDOUT, Overflow/Carryout registers P Output Pn = Pn-1 + CARRYIN + C + (A0 * B0) + (A1*B1) OVERFLOW Output When high, indicates that the result exceeded the width of output P.

OVERFLOW = (P[36] ^ P[35]) | (P[35] ^ P[34])

CARRYOUT Output This bit can be used to extend the adder in the fabric.

CARRYOUT = C[34] ^ D[34] ^ P[35]

CDOUT Output

Cascade

Cascade output of result P. CDOUT is a sign-extended copy of P. The entire bus must either be dangling or drive an entire CDIN of another MATH block in Dot Product mode.

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A – Product Support

Microsemi SoC Products Group backs its products with various support services, including Customer Service, Customer Technical Support Center, a website, electronic mail, and worldwide sales offices. This appendix contains information about contacting Mi crosemi SoC Products Group and using these support services.

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Contact Customer Service for non-technical product support, such as product pricing, product upgrades, update information, order status, and authorization.

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Microsemi SoC Products Group staffs its Customer Technical Support Center with highly skilled engineers who can help answer your hardware, software, and design questions about Microsemi SoC Products. The Customer Technical Support Center spends a great deal of time creating application notes, answers to common design cycle questions, documentation of known issues, and various FAQs. So, before you contact us, please visit our online resources. It is very likely we have already answered your questions.

Technical Support

Visit the Customer Support website (www.microsemi.com/soc/support/search/default.aspx) for more information and support. Many answers available on the searchable web resource include diagrams, illustrations, and links to other resources on the website.

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You can browse a variety of technical and non-technical information on the SoC home page, at

www.microsemi.com/soc.

Contacting the Customer Technical Support Center

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Y ou can communicate your technical questions to our email address and receive answers back by email, fax, or phone. Also, if you have design problems, you can email your design files to receive assistance. We constantly monitor the email account throughout the day. When sending your request to us, please be sure to include your full name, company name, and your contact information for efficient processing of your request.

The technical support email address is soc_tech@microsemi.com.

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