- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄363908 > W946432AD (WINBOND ELECTRONICS CORP) 512K X 4 BANKS X 32 BITS DDR SDRAM PDF資料下載
參數(shù)資料
| 型號(hào)： | W946432AD |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 512K X 4 BANKS X 32 BITS DDR SDRAM |
| 中文描述： | 為512k × 4銀行× 32位DDR內(nèi)存 |
| 文件頁數(shù)： | 18/40頁 |
| 文件大小： | 462K |
| 代理商： | W946432AD |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁當(dāng)前第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁
W946432AD
PRELIMINARY DATE: 9/8/00
18
.
Figure4:tRCD and tRRD Definition
CK
CK
NOP
ACT
Row
Col
Row
Bank x
Bank y
Bank y
tRRD
tRCD
COMMAND
A0-A10
BA0,BA1
tRCD and tRRD Definition
DON'T CARE
NOP
NOP
ACT
NOP
NOP
RD/WR
READs
The starting column and bank addresses are provided with the READ command and AUTO PRECHARGE is
either enabled or disabled for that burst access. If AUTO PRECHARGE is enabled (A8 = high), the row that
is accessed will start precharge at the completion of the burst. This command cannot be interrupted by any
other command. For the generic READ commands used in the following illustrations, AUTO PRECHARGE is
disabled (A8 = low).
During READ bursts, the valid data-out element from the starting column address will be available following
the CAS latency after the READ command. Each subsequent data-out element will be valid nominally at the
next positive or negative clock edge. Figure5: shows general timing. DQS is driven by the DDR SDRAM
along with output data. The initial LOW state on DQS is known as the read preamble; the LOW state
coincident with the last data-out element is known as the read post amble. Upon completion of a burst,
assuming no other commands have been initiated, the DQS will go High-Z.
Data from any READ burst may be concatenated with or truncated with data from a subsequent READ
command. In either case, a continuous flow of data can be maintained. The first data element from the new
burst follows either the last element of a completed burst or the last desired data element of a longer burst
which is being truncated. The new READ command should be issued
x
cycles after the first READ
command, where
x
equals the number of desired data element pairs (pairs are required by the
32
prefects
architecture). This is shown in Figure6:. A READ command can be initiated on any clock cycle following a
previous READ command. Non-consecutive READ data is shown for illustration in Figure7:. Full-speed
random read accesses within a page (or pages) can be performed as shown in Figure8:.
Data from any READ burst may be truncated with a BURST READ STOP command, as shown in
Figure9:The BURST READ STOP latency is equal to the read (CAS) latency.
Data from any READ burst must be completed or truncated before a subsequent WRITE command can be
issued. If truncation is necessary, the BURST READ STOP command must be used, as shown in Figure10:.
A READ burst may be followed by, or truncated with, a PRECHARGE command to the same bank (provided
that AUTO PRECHARGE was not activated). The PRECHARGE command should be issued
x
cycles after
the READ command, where
x
equals the number of desired data element pairs. Note that part of the row
precharge time is hidden during the access of the last data elements.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| W963A6BBN | 512K WORD X 16 BIT LOW POWER PSEUDO SRAM |
| W963A6BBN70 | 512K WORD X 16 BIT LOW POWER PSEUDO SRAM |
| W963A6BBN70E | 512K WORD X 16 BIT LOW POWER PSEUDO SRAM |
| W963A6BBN70I | 512K WORD X 16 BIT LOW POWER PSEUDO SRAM |
| W963A6BBN80 | 512K WORD X 16 BIT LOW POWER PSEUDO SRAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W9464G6IB | 制造商:WINBOND 制造商全稱:Winbond 功能描述:1M × 4 BANKS × 16 BITS DDR SDRAM |
| W9464G6IH | 制造商:WINBOND 制造商全稱:Winbond 功能描述:1M ?? 4 BANKS ?? 16 BITS DDR SDRAM |
| W9464G6JH | 制造商:WINBOND 制造商全稱:Winbond 功能描述:1M ? 4 BANKS ? 16 BITS DDR SDRAM |
| W9464G6JH-4 | 制造商:Winbond Electronics Corp 功能描述:IC DDR SDRAM 64M 200MHZ 66TSOP |
| W9464G6JH-5 | 制造商:Winbond Electronics Corp 功能描述:64MBIT DDRI 制造商:Winbond Electronics Corp 功能描述:IC DDR SDRAM 64M 200MHZ 66TSOP |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。