參數(shù)資料
型號(hào)： μPD4265405
廠商： NEC Corp.
英文描述： 16,777,216 Words by 4 Bits CMOS Dynamic RAMs(64M 動(dòng)態(tài)RAM)
中文描述： 16,777,216詞由4位的CMOS動(dòng)態(tài)存儲(chǔ)器（RAM的6400動(dòng)態(tài)）
文件頁(yè)數(shù)： 6/36頁(yè)
文件大?。?/td> 256K
代理商： ΜPD4265405
μ
PD4264405, 42S65405, 4265405
6
Hyper Page Mode (EDO)
The hyper page mode (EDO) is a kind of page mode with enhanced features. The two major features of the
hyper page mode (EDO) are as follows.
1. Data output time is extended.
In the hyper page mode (EDO), the output data is held to the next CAS cycle’s falling edge, instead of the rising
edge. For this reason, valid data output time in the hyper page mode (EDO) is extended compared with the fast
page mode (= data extend function). In the fast page mode, the data output time becomes shorter as the CAS
cycle time becomes shorter. Therefore, in the hyper page mode (EDO), the timing margin in read cycle is larger
than that of the fast page mode even if the CAS cycle time becomes shorter.
2. The CAS cycle time in the hyper page mode (EDO) is shorter than that in the fast page mode.
In the hyper page mode (EDO), due to the data extend function, the CAS cycle time can be shorter than in the
fast page mode if the timing margin is the same.
Taking a device whose t
RAC
is 60 ns as an example, the CAS cycle time in the fast page mode is 25 ns while that
in the fast page mode is 40 ns.
In the hyper page mode (EDO) , read (data out) and write (data in) cycles can be executed repeatedly during one
RAS cycle. The hyper page mode (EDO) allows both read and write operations during one cycle.
The following shows a part of the hyper page mode (EDO) read cycle. Specifications to be observed are described
in the next page.
Hyper Page Mode (EDO) Read Cycle
t
HPC
t
OEA
t
OEZ
t
AA
t
CAC
Hi - Z
Hi - Z
Row
Col.A
Col.B
Col.C
t
OEA
t
OLZ
RAS
V
IH
–
V
IL
–
CAS
V
IH
–
V
IL
–
Address
V
IH
–
V
IL
–
V
IH
–
V
IL
–
OE
V
IH
–
V
IL
–
I/O
V
OH
–
V
OL
–
Data out A
Data out B
Data out C
Data out C
t
OEZ
t
AA
t
CAC
t
OEZ
t
OEP
t
OEP
t
OCH
t
CHO
t
CHO
WE
t
RAC
t
AA
t
CAC
t
CLZ
t
CLZ
t
WPZ
t
DHC
t
OFC
t
OFR
t
WEZ
t
OCH
t
RRH
t
RCH
相關(guān)PDF資料
PDF描述
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