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參數(shù)資料
| 型號(hào)： | GS8662D11BGD-400 |
| 廠商： | GSI TECHNOLOGY |
| 元件分類： | SRAM |
| 英文描述： | 8M X 9 STANDARD SRAM, 0.45 ns, PBGA165 |
| 封裝： | 13 X 15 MM, 1 MM PITCH, ROHS COMPLIANT, FPBGA-165 |
| 文件頁數(shù)： | 32/34頁 |
| 文件大?。?/td> | 670K |
| 代理商： | GS8662D11BGD-400 |
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Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Rev: 1.02 3/2011
7/34
2011, GSI Technology
GS8662D20/38BD-550/500/450/400/350
GS8662D06/11BD-500/450/400/350
Background
Separate I/O SRAMs, from a system architecture point of view, are attractive in applications where alternating reads and writes are
needed. Therefore, the SigmaQuad-II+ SRAM interface and truth table are optimized for alternating reads and writes. Separate I/O
SRAMs are unpopular in applications where multiple reads or multiple writes are needed because burst read or write transfers from
Separate I/O SRAMs can cut the RAM’s bandwidth in half.
Alternating Read-Write Operations
SigmaQuad-II+ SRAMs follow a few simple rules of operation.
- Read or Write commands issued on one port are never allowed to interrupt an operation in progress on the other port.
- Read or Write data transfers in progress may not be interrupted.
- R and W high always deselects the RAM.
- All address, data, and control inputs are sampled on clock edges.
In order to enforce these rules, each RAM combines present state information with command inputs. See the Truth Table for
details.
SigmaQuad-II+ B4 SRAM DDR Read
The status of the Address Input, W, and R pins are sampled by the rising edges of K. W and R high causes chip disable. A Low on
the Read Enable pin, R, begins a read cycle. R is always ignored if the previous command loaded was a read command. Clocking
in a High on the Read Enable pin, R, begins a read port deselect cycle.
SigmaQuad-II+ B4 SRAM DDR Write
The status of the Address Input, W, and R pins are sampled by the rising edges of K. W and R High causes chip disable. A Low on
the Write Enable pin, W, and a High on the Read Enable pin, R, begins a write cycle. W is always ignored if the previous command
was a write command. Data is clocked in by the next rising edge of K, the rising edge of K after that, the next rising edge of K, and
finally by the next rising edge of K.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| GS8662D36BD-300IT | 2M X 36 STANDARD SRAM, 0.45 ns, PBGA165 |
| GS8662DT10BGD-400IT | 8M X 9 QDR SRAM, 0.45 ns, PBGA165 |
| GS8662Q18BD-357 | 4M X 18 STANDARD SRAM, 0.45 ns, PBGA165 |
| GS8662Q18BGD-357IT | 4M X 18 STANDARD SRAM, 0.45 ns, PBGA165 |
| GS8662Q18GE-167IT | 4M X 18 STANDARD SRAM, 0.5 ns, PBGA165 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GS8662D18BGD-300I | 制造商:GSI Technology 功能描述:GS8662D18BGD-300I - Trays |
| GS8662D18E-167 | 制造商:GSI 制造商全稱:GSI Technology 功能描述:72Mb SigmaQuad-II Burst of 4 SRAM |
| GS8662D18E-167I | 制造商:GSI 制造商全稱:GSI Technology 功能描述:72Mb SigmaQuad-II Burst of 4 SRAM |
| GS8662D18E-200 | 制造商:GSI 制造商全稱:GSI Technology 功能描述:72Mb SigmaQuad-II Burst of 4 SRAM |
| GS8662D18E-200I | 制造商:GSI 制造商全稱:GSI Technology 功能描述:72Mb SigmaQuad-II Burst of 4 SRAM |
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