FPGA访问同步SRAM与异步SRAM有什么区别吗？

只看该作者 · 2016-7-5 20:46

现在遇到的问题有两个：
1.同步SRAM访问需要提供时钟，而异步不需要。与访问异步SRAM区别大吗？以前做过FPGA+异步SRAM的方案，但异步SRAM最快才8ns的读写周期，不能满足应用，于是换成了一片同步SRAM，可以达到250M。就是不知道两者用法上的区别。
2.选的同步SRAM是36bit字长的，它每个字节有个奇偶位，所以一共就有36位字长了。但是这个奇偶位（就是同步SRAM上的DQP管脚）是做什么的？

2万 · 2016-7-5 22:00

1、同步是时钟触发锁存，异步是组合逻辑，底层写法完全不一样。当然，你作为内存模块在上层组合引用可以不管它们的区别，但异步每次都需要地址，同步一定条件下可以突发而不用外部去递加、传送地址。现在有很多更快的。

2、多存储1bit奇偶位,和内存控制器配合可以检验出内存数据是否错误、内存芯片是否损坏或不可靠，数据可靠性可信性更有保障

只看该作者 · 2016-7-6 22:18

xwj 发表于 2016-7-5 22:00
1、同步是时钟触发锁存，异步是组合逻辑，底层写法完全不一样。当然，你作为内存模块在上层组合引用可以不 ...

受教了，十分感谢。主要是要做板子了，所以想弄清楚点。我查了同步SRAM的IO电平3.3V/2.5V都可，直接连接到FPGA管脚上，FPGA的iobank供上相同的电平就行了吧。

只看该作者 · 2019-5-10 16:14

韩国NETSOL 中国区总代理全球芯 www.globalizex.com
kevin@globalizex.com 微信/ QQ: 1330645577 电话 13924645577

Netsol的前身为韩国Samsung SRAM事业部，分立出来后一直致力于
SRAM芯片的研发与创新，在SRAM领域拥有比较完整的产品线：
Quadruple / DDR SRAM ， Synchronous SRAM（同步），
Asynchronous Fast SRAM（异步）。深圳市全球芯科技有限公司为Netsol授权中国区总代理，
现在使用Netsol产品的都为一些电子工业巨头所使用，如3Com，CISCO，ZTE，HUAWEI等。
我们的同步高速SRAM产品可与 ISSI，Cypress，Lyontek之系列兼容替代，比如Netsol的S7R161882M
型号的产品可替代Cypress的CY7C1312KV18型号的产品，且在某些参数性能上有一定的优势。

SRAM产品分为低功耗SRAM和高速缓存SRAM，同步SRAM和异步SRAM
，容量从1Mb到144Mb.广泛应用于医疗工业设备，通讯，测试检测设备，
显示设备等，外置于STM32等MCU，Xilinx，Altera等FPGA周边电路，低延
时性，超低功耗。

NETSOL SRAM产品型号：
Density Org. Part Number Vdd(V) Access Time Package Availability
1M bit 64Kx16 S6R1016W1A 1.65~3.6 8/10/12/15ns 44TSOP2 Now
S6R1016V1A 3.3 8/10ns 48FBGA Now
S6R1016C1A 5 10ns Now
128Kx8 S6R1008W1A 1.65~3.6 8/10/12/15ns 32sTSOP1 Now
S6R1008V1A 3.3 8/10ns 36FBGA Now
S6R1008C1A 5 10ns Now
2M bit 128Kx16 S6R2016W1A 1.65~3.6 8/10/12/15ns 44TSOP2 Now
S6R2016V1A 3.3 8/10ns 48FBGA Now
S6R2016C1A 5 10ns Now
256Kx8 S6R2008W1A 1.65~3.6 8/10/12/15ns 44TSOP2 Now
S6R2008V1A 3.3 8/10ns 36FBGA Now
S6R2008C1A 5 10ns Now
4M bit 256Kx16 S6R4016W1A 1.65~3.6 8/10/12/15ns 44TSOP2 Now
S6R4016V1A 3.3 8/10ns 48FBGA Now
S6R4016C1A 5 10ns Now
512Kx8 S6R4008W1A 1.65~3.6 8/10/12/15ns 44TSOP2 Now
S6R4008V1A 3.3 8/10ns 36FBGA Now
S6R4008C1A 5 10ns Now
8M bit 512Kx16 S6R8016W1A 1.65~3.6 8/10/12/15ns 44TSOP2 Now
S6R8016C1A 5 10ns 48FBGA Now
1Mx8 S6R8008W1A 1.65~3.6 8/10/12/15ns 44TSOP2 Now
S6R8008C1A 5 10ns 48FBGA Now
16M bit 1Mx16 S6R1616W1M 1.65~3.6 8/10/12/15ns 48TSOP1 Now
S6R1616V1M 3.3 8/10ns 48FBGA Now
S6R1616C1M 5 10ns Now
2Mx8 S6R1608W1M 1.65~3.6 8/10/12/15ns 44TSOP2 Now
S6R1608V1M 3.3 8/10ns 48FBGA Now
S6R1608C1M 5 10ns Now
32M bit 2Mx16 S6R3216W1M 1.65~3.6 8/10/12/15ns 48FBGA Now
4Mx8 S6R3208W1M 1.65~3.6 8/10/12/15ns Now

2. ASYNC Low Power SRAM
Density Org. Part Number Vdd(V) C/S Speed -tAA(ns) Package Availability
Option
1M bit 64Kx16 S6L1016W1M 2.3~3.6 1 C/S 45/55/70ns 44TSOP2, 48FBGA Now
S6L1016C1M 4.5~5.5 1 C/S 44TSOP2, 48FBGA Now
128Kx8 S6L1008W2M 2.3~3.6 2 C/S 45/55/70ns 32sTSOP1, 2TSOP1, 32SOP Now
S6L1008C2M 4.5~5.5 2 C/S Now
2M bit 128Kx16 S6L2016W1M 2.3~3.6 1 C/S 45/55/70ns 44TSOP2,48FBGA Now
S6L2016W2M 2.3~3.6 2 C/S 48FBGA Now
S6L2016C1M 4.5~5.5 1 C/S 44TSOP2 Now
256Kx8 S6L2008W1M 2.3~3.6 1 C/S 45/55/70ns 36FBGA Now
S6L2008W2M 2.3~3.6 2 C/S 32sTSOP1, 32TSOP1, 32TSOP2, 32SOP Now
S6L2008C2M 4.5~5.5 2 C/S Now
4M bit 256Kx16 S6L4016W1M 2.3~3.6 1 C/S 45/55/70ns 44TSOP2, 48FBGA Now
S6L4016W2M 2.3~3.6 2 C/S 44TSOP2, 48FBGA Now
S6L4016C1M 4.5~5.5 1 C/S 44TSOP2 Now
S6L4016C2M 4.5~5.5 2 C/S 44TSOP2 Now
512Kx8 S6L4008W1M 2.3~3.6 1 C/S 45/55/70ns 32sTSOP1, 32TSOP1, 32TSOP2, 32SOP Now
S6L4008C1M 4.5~5.5 1 C/S Now
8M bit 512Kx16 S6L8016W1M 2.3~3.6 1 C/S 45/55/70ns 44TSOP2, 48FBGA Now
S6L8016W2M 2.3~3.6 2 C/S 44TSOP2, 48FBGA Now
S6L8016C1M 4.5~5.5 1 C/S 44TSOP2, 48FBGA Now
S6L8016C2M 4.5~5.5 2 C/S 48FBGA Now
1Mx8 S6L8008W2M 2.3~3.6 2 C/S 45/55/70ns 44TSOP2, 48FBGA Now
S6L8008C2M 4.5~5.5 2 C/S 44TSOP2, 48FBGA Now

3. Sync SRAM

(1) Synchronous Pipe Burst SRAM
Density Org. Part Number Operating VDD(V) tCYC Access Time Package Availability
4M bit 128Kx36 S7A403630M SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
256Kx18 S7A401830M SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
9M bit 256Kx36 S7A803630M SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
512Kx18 S7A801830M SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
18M bit 512Kx36 S7A163630M SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
1Mx18 S7A161830M SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
36M bit 1Mx36 S7A323630M SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
2Mx18 S7A321830M SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
72M bit 2Mx36 S7A643630M SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
4Mx18 S7A641830M SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now

(2) Synchronous Flow Through SRAM
Density Org. Part Number Operating VDD(V) tCYC Access Time Package Availability
4M bit 128Kx36 S7B403635M FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
256Kx18 S7B401835M FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
9M bit 256Kx36 S7B803635M FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
512Kx18 S7B801835M FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
18M bit 512Kx36 S7B163635M FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
1Mx18 S7B161835M FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
36M bit 1Mx36 S7B323635M FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
2Mx18 S7B321835M FT 2.3~3.5 133MHz 6.5ns 100LQFP Now
72M bit 2Mx36 S7B643635M FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
4Mx18 S7B641835M FT 2.3~3.5 133MHz 6.5ns 100LQFP Now

(3) NT Pipe Burst SRAM
Density Org. Part Number Operating VDD(V) tCYC Access Time Package Availability
4M bit 128Kx36 S7N403631M NT_SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
256Kx18 S7N401831M NT_SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
9M bit 256Kx36 S7N803631M NT_SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
512Kx18 S7N801831M NT_SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
18M bit 512Kx36 S7N163631M NT_SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
1Mx18 S7N161831M NT_SPB 2.3~3.5 250MHz 2.6ns 165FBGA Now
36M bit 1Mx36 S7N323631M NT_SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
2Mx18 S7N321831M NT_SPB 2.3~3.5 250MHz 2.6ns 165FBGA Now
72M bit 2Mx36 S7N643631M NT_SPB 2.3~3.5 250MHz 2.6ns 100TQFP Now
4Mx18 S7N641831M NT_SPB 2.3~3.5 250MHz 2.6ns 165FBGA Now

(4) NT Flow Through SRAM
Density Org. Part Number Operating VDD(V) tCYC Access Time Package Availability
4M bit 128Kx36 S7M403635M NT_FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
256Kx18 S7M401835M NT_FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
9M bit 256Kx36 S7M803635M NT_FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
512Kx18 S7M801835M NT_FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
18M bit 512Kx36 S7M163635M NT_FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
1Mx18 S7M161835M NT_FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
36M bit 1Mx36 S7M323635M NT_FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
2Mx18 S7M321835M NT_FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
72M bit 2Mx36 S7M643635M NT_FT 2.3~3.5 133MHz 6.5ns 100TQFP Now
4Mx18 S7M641835M NT_FT 2.3~3.5 133MHz 6.5ns 100TQFP Now

(5) DDR Sync. SRAM
Density Org. Part Number Operating VDD Cycle time Burst Clock Package
Mode (V) (MHz) Length Latency
18M bit 512Kx36(1Mx18) S7I1636(18)82M DDR II 1.8 333,300,250 2 1.5 165FBGA
512Kx36(1Mx18) S7K1636(18)T2M DDR II+ 1.8 450,400,333 2 2 165FBGA
512Kx36(1Mx18) S7K1636(18)U2M DDR II+ 1.8 550,450,400 2 2.5 165FBGA
512Kx36(1Mx18) S7L1636(18)T2M DDR II+, ODT 1.8 450,400,333 2 2 165FBGA
512Kx36(1Mx18) S7L1636(18)U2M DDR II+, ODT 1.8 550,450,400 2 2.5 165FBGA
512Kx36(1Mx18) S7J1636(18)82M DDR II, SIO 1.8 333,300,250 2 1.5 165FBGA
512Kx36(1Mx18) S7I1636(18)84M DDR II 1.8 333,300,250 4 1.5 165FBGA
36M bit 1Mx36(2Mx18) S7I3236(18)82M DDR II 1.8 333,300,250 2 1.5 165FBGA
1Mx36(2Mx18) S7K3236(18)T2M DDR II+ 1.8 450,400,333 2 2 165FBGA
1Mx36(2Mx18) S7K3236(18)U2M DDR II+ 1.8 550,450,400 2 2.5 165FBGA
1Mx36(2Mx18) S7L3236(18)T2M DDR II+, ODT 1.8 450,400,333 2 2 165FBGA
1Mx36(2Mx18) S7L3236(18)U2M DDR II+, ODT 1.8 550,450,400 2 2.5 165FBGA
1Mx36(2Mx18) S7I3236(18)84M DDR II 1.8 333,300,250 4 1.5 165FBGA
1Mx36(2Mx18) S7J3236(18)82M DDR II, SIO 1.8 333,300,250 2 1.5 165FBGA
72M bit 2Mx36(4Mx18) S7I6436(18)82M DDR II 1.8 333,300,250 2 1.5 165FBGA
2Mx36(4Mx18) S7K6436(18)T2M DDR II+ 1.8 450,400,333 2 2 165FBGA
2Mx36(4Mx18) S7K6436(18)U2M DDR II+ 1.8 550,450,400 2 2.5 165FBGA
2Mx36(4Mx18) S7L6436(18)T2M DDR II+, ODT 1.8 450,400,333 2 2 165FBGA
2Mx36(4Mx18) S7L6436(18)U2M DDR II+, ODT 1.8 550,450,400 2 2.5 165FBGA
2Mx36(4Mx18) S7J6436(18)82M DDR II, SIO 1.8 333,300,250 2 1.5 165FBGA
2Mx36(4Mx18) S7I6436(18)84M DDR II 1.8 333,300,250 4 1.5 165FBGA

(6) Quadruple Sync. SRAM
Density Org. Part Number Operating VDD Cycle time Burst Clock Package
Mode (V) (MHz) Len. Latency
18M bit 512Kx36(1Mx18) S7Q1636(18)62M QDR I 1.8~2.5 167 2 1 165FBGA
512Kx36(1Mx18) S7R1636(18)82M QDR II 1.8 333,300,250 2 1.5 165FBGA
512Kx36(1Mx18) S7Q1636(18)64M QDR I 1.8~2.5 167 4 1 165FBGA
512Kx36(1Mx18) S7R1636(18)84M QDR II 1.8 333,300,250 4 1.5 165FBGA
512Kx36(1Mx18) S7S1636(18)T4M QDR II+ 1.8 450,400,333 4 2 165FBGA
512Kx36(1Mx18) S7S1636(18)U4M QDR II+ 1.8 550,450,400 4 2.5 165FBGA
512Kx36(1Mx18) S7T1636(18)T4M QDR II+, ODT 1.8 450,400,333 4 2 165FBGA
512Kx36(1Mx18) S7T1636(18)U4M QDR II+, ODT 1.8 550,450,400 4 2.5 165FBGA
36M bit 1Mx36(2Mx18) S7R3236(18)82M QDR II 1.8 333,300,250 2 1.5 165FBGA
4Mx9 S7R320982M QDR II 1.8 333,300,250 2 1.5 165FBGA
1Mx36(2Mx18) S7S3236(18)U2M QDR II+ 1.8 450,400,366 2 2.5 165FBGA
1Mx36(2Mx18) S7R3236(18)84M QDR II 1.8 333,300,250 4 1.5 165FBGA
4Mx9 S7R320984M QDR II 1.8 333,300,250 4 1.5 165FBGA
1Mx36(2Mx18) S7S3236(18)T4M QDR II+ 1.8 450,400,333 4 2 165FBGA
1Mx36(2Mx18) S7S3236(18)U4M QDR II+ 1.8 550,450,400 4 2.5 165FBGA
1Mx36(2Mx18) S7T3236(18)T4M QDR II+, ODT 1.8 450,400,333 4 2 165FBGA
1Mx36(2Mx18) S7T3236(18)U4M QDR II+, ODT 1.8 550,450,400 4 2.5 165FBGA
72M bit 2Mx36(4Mx18) S7R6436(18)82M QDR II 1.8 333,300,250 2 1.5 165FBGA
8Mx9 S7R640982M QDR II 1.8 333,300,250 2 1.5 165FBGA
2Mx36(4Mx18) S7S6436(18)U2M QDR II+ 1.8 450,400,366 2 2.5 165FBGA
2Mx36(4Mx18) S7T6436(18)T2M QDR II+, ODT 1.8 400,357,333 2 2 165FBGA
2Mx36(4Mx18) S7R6436(18)84M QDR II 1.8 333,300,250 4 1.5 165FBGA
2Mx36(4Mx18) S7S6436(18)T4M QDR II+ 1.8 450,400,333 4 2 165FBGA
2Mx36(4Mx18) S7S6436(18)U4M QDR II+ 1.8 550,450,400 4 2.5 165FBGA
2Mx36(4Mx18) S7T6436(18)T4M QDR II+, ODT 1.8 450,400,333 4 2 165FBGA
2Mx36(4Mx18) S7T6436(18)U4M QDR II+, ODT 1.8 550,450,400 4 2.5 165FBGA
144M bit 4Mx36(8Mx18) S7R4436(18)82M QDR II 1.8 333,300,250 2 1.5 165FBGA
16Mx9 S7R440982M QDR II 1.8 333,300,250 2 1.5 165FBGA
4Mx36(8Mx18) S7S4436(18)U2M QDR II+ 1.8 450,400,366 2 2.5 165FBGA
4Mx36(8Mx18) S7T4436(18)T2M QDR II+, ODT 1.8 400,357,333 2 2 165FBGA
4Mx36(8Mx18) S7R4436(18)84M QDR II 1.8 333,300,250 4 1.5 165FBGA
4Mx36(8Mx18) S7S4436(18)T4M QDR II+ 1.8 450,400,333 4 2 165FBGA
4Mx36(8Mx18) S7S4436(18)U4M QDR II+ 1.8 550,450,400 4 2.5 165FBGA
4Mx36(8Mx18) S7T4436(18)T4M QDR II+, ODT 1.8 450,400,333 4 2 165FBGA
4Mx36(8Mx18) S7T4436(18)U4M QDR II+, ODT 1.8 550,450,400 4 2.5 165FBGA

FPGA访问同步SRAM与异步SRAM有什么区别吗？

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