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參數(shù)資料
| 型號(hào)： | WEDPN16M64VR-125BC |
| 廠商： | MICROSEMI CORP-PMG MICROELECTRONICS |
| 元件分類： | DRAM |
| 英文描述： | 16M X 64 SYNCHRONOUS DRAM MODULE, 5.8 ns, PBGA219 |
| 封裝： | 32 X 25 MM, PLASTIC, BGA-219 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 423K |
| 代理商： | WEDPN16M64VR-125BC |
White Electronic Designs Corporation (602) 437-1520 www.whiteedc.com
WEDPN16M64VR-XBX
6
ALLOWABLE OPERATING
FREQUENCY (MHZ)
CAS
SPEED
LATENCY = 2
LATENCY = 3
-133
≤ 100
≤ 133
-125
≤ 100
≤ 125
-100
≤ 66
≤ 100
-66
≤ 50
≤ 66
CAS LATENCY
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 relevant
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 start driving after T1 and the data will be valid by
T2. Table 2 below indicates the operating frequencies at
which each CAS latency setting can be used.
Reserved states should not be used as unknown operation
or incompatibility with future versions may result.
OPERATING MODE
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.
Test modes and reserved states should not be used because
unknown operation or incompatibility with future versions
may result.
WRITE BURST MODE
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
COMMANDS
The Truth Table provides a quick reference of available
commands. 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.
FIG. 4 CAS LATENCY
TABLE 2 - CAS LATENCY
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| WEDPN16M64VR-133B2C | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:16Mx64 REGISTERED SYNCHRONOUS DRAM |
| WEDPN16M64VR-133B2I | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:16Mx64 REGISTERED SYNCHRONOUS DRAM |
| WEDPN16M64VR-133B2M | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:16Mx64 REGISTERED SYNCHRONOUS DRAM |
| WEDPN16M64VR-66BC | 制造商:Microsemi Corporation 功能描述:16M X 64 SDRAM MODULE W/REGISTERED BUFFERS, 3.3V, 66 MHZ, 21 - Bulk |
| WEDPN16M64VR-66BI | 制造商:Microsemi Corporation 功能描述:16M X 64 SDRAM MODULE W/REGISTERED BUFFERS, 3.3V, 66 MHZ, 21 - Bulk |
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