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| 型號： | WEDPNF8M722V-1015BI |
| 廠商： | WHITE ELECTRONIC DESIGNS CORP |
| 元件分類： | 存儲器 |
| 英文描述： | SPECIALTY MEMORY CIRCUIT, PBGA275 |
| 封裝： | 32 X 25 MM, PLASTIC, BGA-275 |
| 文件頁數(shù)： | 2/43頁 |
| 文件大?。?/td> | 1280K |
| 代理商： | WEDPNF8M722V-1015BI |
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White Electronic Designs Corporation Phoenix AZ (602) 437-1520
White Electronic Designs
WEDPNF8M722V-XBX
CAS LATENCY
FIG. 4
CAS LATENCY
OPERATING MODE
WRITE BURST MODE
TABLE 2 - CAS LATENCY
ALLOWABLE OPERATING
FREQUENCY (MHZ)
CAS
SPEED
LATENCY = 2
LATENCY = 3
-100
≤ 75
≤ 100
-125
≤ 100
≤ 125
COMMANDS
The CAS latency is the delay, in clock cycles, between the
registration of a READ command and the availability of the
first piece of output data. The latency can be set to two or
three clocks.
If a READ command is registered at clock edge
n, and the
latency is
m clocks, the data will be available by clock edge
n+m. The I/Os will start driving as a result of the clock edge
one cycle earlier (
n + m - 1), and provided that the rel-
evant access times are met, the data will be valid by clock
edge
n + m. For example, assuming that the clock cycle
time is such that all relevant access times are met, if a READ
command is registered at T0 and the latency is programmed
to two clocks, the I/Os will star t driving after T1 and the
data will be valid by T2. Table 2 indicates the operating fre-
quencies at which each CAS latency setting can be used.
Reserved states should not be used as unknown operation
or incompatibility with future versions may resuSELF SELF Test
modes and reserved states should not be used because
unknown operation or incompatibility with future versions
may result.
The normal operating mode is selected by setting M7and M8
to zero; the other combinations of values for M7 and M8 are
reserved for future use and/or test modes. The programmed
burst length applies to both READ and WRITE bursts.
When M9 = 0, the burst length programmed via M0-M2
applies to both READ and WRITE bursts; when M9 = 1, the
programmed burst length applies to READ bursts, but write
accesses are single-location (nonburst) accesses.
The Truth Table provides a quick reference of available com-
mands. This is followed by a written description of each
command. Three additional Truth Tables appear following
the Operation section; these tables provide current state/
next state information.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| WEDPNF8M722V-1015BM | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:8Mx72 Synchronous DRAM + 16Mb Flash Mixed Module Multi-Chip Package |
| WEDPNF8M722V-1210BC | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:8Mx72 Synchronous DRAM + 16Mb Flash Mixed Module Multi-Chip Package |
| WEDPNF8M722V-1210BI | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:8Mx72 Synchronous DRAM + 16Mb Flash Mixed Module Multi-Chip Package |
| WEDPNF8M722V-1210BM | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:8Mx72 Synchronous DRAM + 16Mb Flash Mixed Module Multi-Chip Package |
| WEDPNF8M722V-1212BC | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:8Mx72 Synchronous DRAM + 16Mb Flash Mixed Module Multi-Chip Package |
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