Lattice Semiconductor iCE40 SPRAM Series Technical Note Download | Manualshive

Page: 2 / 12

background image

iCE40 SPRAM Usage Guide

Technical Note

© 2016 Lattice Semiconductor Corp. All Lattice trademarks, registered trademarks, patents, and disclaimers are as listed at

www.latticesemi.com/legal

. All other brand or product names are

trademarks or registered trademarks of their respective holders. The specifications and information herein are subject to change without notice.

2

TN1314-1.0

Contents

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

Single Port RAM Primitives ........................................................................................................................................... 3

User Primitive SB_SPRAM256KA ......................................................................................................................... 3

SPRAM Port Definitions and GUI Options ........................................................................................................... 4

Power Save States for SPRAM ...................................................................................................................................... 6

Normal State ....................................................................................................................................................... 6

Standby State ...................................................................................................................................................... 6

Sleep State ........................................................................................................................................................... 6

Power Off State ................................................................................................................................................... 6

Use Cases for User Primitive SB_SPRAM256KA ............................................................................................................ 7

Instantiating Memories ....................................................................................................................................... 7

Inferring Memories ............................................................................................................................................. 7

Output Pipeline Registers .................................................................................................................................... 7

Cascading Memories ........................................................................................................................................... 8

Address Cascading (or Depth Cascading) ........................................................................................................ 8

Data Cascading (or Width Cascading) ............................................................................................................. 9

Technical Support Assistance ............................................................................................................................................. 10

Revision History .................................................................................................................................................................. 11

Figures

Figure 2.1. SB_SPRAM256KA SPRAM Primitive .................................................................................................................... 3

Figure 4.1. Address/Depth Cascading Example for 32K x 16 SPRAM using Primitive ........................................................... 8

Figure 4.2. Data/Width Cascading Example for 16K x 32 SPRAM using Primitive ................................................................ 9

Tables

Table 2.1. SB_SPRAM256KA RAM Port Definitions .............................................................................................................. 4

«
1
2
3
4
...
»

Summary of Contents for iCE40 SPRAM Series

Page 1: ...iCE40 SPRAM Usage Guide Technical Note TN1314 Version 1 0 June 2016...

Page 2: ...ons and GUI Options 4 Power Save States for SPRAM 6 3 3 1 Normal State 6 3 2 Standby State 6 3 3 Sleep State 6 3 4 Power Off State 6 Use Cases for User Primitive SB_SPRAM256KA 7 4 4 1 Instantiating Me...

Page 3: ...r 256 kb memory blocks available that is total 1024 kb of Single Port memory Single Port RAM Primitives 2 The iCE40 devices offer four embedded memory blocks of SPRAM Each of these blocks can be confi...

Page 4: ...DATAIN 15 0 D 15 0 Data Input 16b 0000000000000000 The Data Input bus is used to write the data into the memory location specified by Address input port during the write cycle MASKWREN 3 0 WEM 15 0 M...

Page 5: ...us the MASKWREN has to map to WEM as follows MASKWREN 3 WEM 15 MASKWREN 3 WEM 14 MASKWREN 3 WEM 13 MASKWREN 3 WEM 12 MASKWREN 2 WEM 11 MASKWREN 2 WEM 10 MASKWREN 2 WEM 9 MASKWREN 2 WEM 8 MASKWREN 1 WE...

Page 6: ...not change when the RAM is placed in Standby State It is to be noted that Standby State is referred to as Light Sleep state in the RAM datasheet The name STANDBY has been chosen to match and be consis...

Page 7: ...ROFF POWEROFF DATAOUT DATAOUT_A SB_SPRAM256KA ramfn_inst2 DATAIN DATAIN ADDRESS ADDRESS MASKWREN MASKWREN WREN WREN CHIPSELECT CHIPSELECT CLOCK CLOCK STANDBY STANDBY SLEEP SLEEP POWEROFF POWEROFF DATA...

Page 8: ...ogic required will be implemented in the device fabric for creating larger memories Address Cascading or Depth Cascading 4 4 1 Address Depth cascading is useful when the memories are required to have...

Page 9: ...gic is needed essentially for concatenating words from individual SPRAM blocks Figure 4 2 shows an example of the Width cascading of a 16k x 32 SPRAM The rest of the signals that are not shown should...

Page 10: ...are as listed at www latticesemi com legal All other brand or product names are trademarks or registered trademarks of their respective holders The specifications and information herein are subject t...

Page 11: ...d disclaimers are as listed at www latticesemi com legal All other brand or product names are trademarks or registered trademarks of their respective holders The specifications and information herein...

Page 12: ...7 th Floor 111 SW 5 th Avenue Portland OR 97204 USA T 503 268 8000 www latticesemi com...

Reviews:

No comments

Related manuals for iCE40 SPRAM Series

Brand: VAF instruments Pages: 56

H3C S7500E Series

Brand: H3C Pages: 34

SR8800 IM-FW-II

Brand: H3C Pages: 5

H3C S7500E Series

Brand: H3C Pages: 50

DR-4100P Series

Brand: Idis Pages: 30

Brand: A10 Pages: 52

Brand: ForeScout Pages: 28

Brand: Alacritech Pages: 20

IntroSpect Analyzer 2 Series

Brand: Aruba Pages: 5

HIRESCHMANN IT MAMMUTHUS MTM8003-FAN

Brand: Belden Pages: 84

Mercury FireWire 400

Brand: OWC Pages: 2

Brand: Paradyne Pages: 6

BROADCAST POLLING FRAD BPF-14 BU

Brand: DCB Pages: 28

Brand: Rainbow Pages: 2

Brand: Intercoax Pages: 2

500 - DATASHEET REV 003

Brand: Intel Pages: 67

Brand: Raven Pages: 33

Brand: DFRobot Pages: 30

Brands by name

0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Popular brands

Load more brands