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参数资料
| 型号： | CY7C0851AV-133AXI |
| 厂商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分类： | SRAM |
| 英文描述： | FLEx36™ 3.3V 32K/64K/128K/256K x 36 Synchronous Dual-Port RAM |
| 中文描述： | 64K X 36 DUAL-PORT SRAM, 4 ns, PQFP176 |
| 封装： | 24 X 24 MM, 1.40 MM HEIGHT, LEAD FREE, TQFP-176 |
| 文件页数： | 2/36页 |
| 文件大小： | 956K |
| 代理商： | CY7C0851AV-133AXI |
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CY7C0850AV,CY7C0851V/CY7C0851AV
CY7C0852V/CY7C0852AV
CY7C0853V/CY7C0853AV
Document #: 38-06070 Rev. *J
Page 10 of 36
Counter Interrupt
The counter interrupt (CNTINT) is asserted LOW when an
increment operation results in the unmasked portion of the
counter register being all “1s.” It is deasserted HIGH when an
Increment operation results in any other value. It is also
de-asserted by Counter Reset, Counter Load, Mask Reset and
Mask Load operations, and by MRST.
Retransmit
Retransmit is a feature that allows the Read of a block of memory
more than once without the need to reload the initial address.
This eliminates the need for external logic to store and route
data. It also reduces the complexity of the system design and
saves board space. An internal “mirror register” is used to store
the initially loaded address counter value. When the counter
unmasked portion reaches its maximum value set by the mask
register, it wraps back to the initial value stored in this “mirror
register.” If the counter is continuously configured in increment
mode, it increments again to its maximum value and wraps back
to the value initially stored into the “mirror register.” Thus, the
repeated access of the same data is allowed without the need
for any external logic.
Mask Reset Operation
The mask register is reset to all “1s,” which unmasks every bit of
the counter. Master reset (MRST) also resets the mask register
to all “1s.”
Mask Load Operation
The mask register is loaded with the address value presented at
the address lines. Not all values permit correct increment
operations. Permitted values are of the form 2n – 1 or 2n – 2.
From the most significant bit to the least significant bit, permitted
values have zero or more “0s,” one or more “1s,” or one “0.” Thus
1FFFF, 003FE, and 00001 are permitted values, but 1F0FF,
003FC, and 00000 are not.
Mask Readback Operation
The internal value of the mask register can be read out on the
address lines. Readback is pipelined; the address is valid tCM2
after the next rising edge of the port’s clock. If mask readback
occurs while the port is enabled (CE0 LOW and CE1 HIGH), the
data lines (DQs) is three-stated. Figure 4 on page 11 shows a
block diagram of the operation.
Counting by Two
When the least significant bit of the mask register is “0,” the
counter increments by two. This may be used to connect the
CY7C0850AV/CY7C0851V/0851AV/CY7C0852V/CY7C0852AV
as a 72-bit single port SRAM in which the counter of one port
counts even addresses and the counter of the other port counts
odd addresses. This even-odd address scheme stores one half
of the 72-bit data in even memory locations, and the other half in
odd memory locations.
相关PDF资料 |
PDF描述 |
|---|---|
| CY7C0851AV-133BBI | FLEx36™ 3.3V 32K/64K/128K/256K x 36 Synchronous Dual-Port RAM |
| CY7C0851AV-167BBXC | FLEx36™ 3.3V 32K/64K/128K/256K x 36 Synchronous Dual-Port RAM |
| CY7C0852AV-133AXC | FLEx36™ 3.3V 32K/64K/128K/256K x 36 Synchronous Dual-Port RAM |
| CY7C0852AV-133AXI | FLEx36™ 3.3V 32K/64K/128K/256K x 36 Synchronous Dual-Port RAM |
| CY7C0852AV-133BBI | FLEx36™ 3.3V 32K/64K/128K/256K x 36 Synchronous Dual-Port RAM |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CY7C0851AV-133BBC | 制造商:Cypress Semiconductor 功能描述: 制造商:Cypress Semiconductor 功能描述:SRAM SYNC DUAL 3.3V 2.25MBIT 64KX36 4.7NS 172FBGA - Trays 制造商:Rochester Electronics LLC 功能描述: |
| CY7C0851AV-133BBI | 功能描述:静态随机存取存储器 2MB (64Kx36) 3.3v 133MHz Synch 静态随机存取存储器 RoHS:否 制造商:Cypress Semiconductor 存储容量:16 Mbit 组织:1 M x 16 访问时间:55 ns 电源电压-最大:3.6 V 电源电压-最小:2.2 V 最大工作电流:22 uA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:TSOP-48 封装:Tray |
| CY7C0851AV-167AC | 制造商:Cypress Semiconductor 功能描述:SRAM SYNC DUAL 3.3V 2.25MBIT 64KX36 4NS 176TQFP - Trays |
| CY7C0851AV-167AXC | 功能描述:静态随机存取存储器 3.3V, 64Kx36 Sync Dual Port RoHS:否 制造商:Cypress Semiconductor 存储容量:16 Mbit 组织:1 M x 16 访问时间:55 ns 电源电压-最大:3.6 V 电源电压-最小:2.2 V 最大工作电流:22 uA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:TSOP-48 封装:Tray |
| CY7C0851AV-167BBC | 制造商:Cypress Semiconductor 功能描述:SRAM SYNC DUAL 3.3V 2.25MBIT 64KX36 4NS 172FBGA - Trays 制造商:Rochester Electronics LLC 功能描述: |
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