HY5S5B6ELF-HE Datasheet, PDF (9/27 Pages) Hynix Semiconductor – 256MBit MOBILE SDR SDRAMs based on 4M x 4Bank x16 I/O

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256Mbit (16Mx16bit) Mobile SDR Memory
HY5S5B6ELF(P)-xE Series
Write
The WRITE command is used to initiate the burst write of data. This command is initiated by activating CS, CAS, WE
and deasserting RAS at the positive edge of the clock. BA1 and BA0 inputs select the bank, A8-A0 address inputs select
the starting column location. The value on input A10 determines whether or not Auto Precharge is used.
If Auto Precharge is selected the row being accessed will be precharged at the end of the WRITE burst; if Auto Pre-
charge is not selected, the row will remain active for subsequent accesses.
Precharge
The Precharge command is used to close the open row in a particular bank or the open row in all banks. When the
precharge command is issued with address A10, high, then all banks will be precharged, and If A10 is low, the open
row in a particular bank will be precharged. The bank(s) will be available when the minimum tRP time is met after the
precharge command is issued.
Auto Precharge
The Auto Precharge command is issued to close the open row in a particular bank after READ or WRITE operation. If
A10 is high when a READ or WRITE command is issued, the READ or WRITE with Auto Precharge is initiated.
Burst Termination
The Burst Termination is used to terminate the burst operation. This function can be accomplished by asserting a Burst
Stop command or a Precharge command during a burst READ or WRITE operation. The Precharge command interrupts
a burst cycle and close the active bank, and the Burst Stop command terminates the existing burst operation leave the
bank open.
Data Mask
The Data Mask comamnd is used to mask READ or WRITE data. During a READ operation, When this command is
issued, data outputs are disabled and become high impedance after two clock delay. During a WRITE operation, When
this command is issued, data inputs can't be written with no clock delay.
CLK
Command
CKE
Internal CLK
DQ
RD
Masked by CKE
Frozen Int. CLK by CKE
(CKE = Fixed Low)
Q1
Q2
Q3 Q4
Command
CKE
Internal CLK
DQ
WR
Clock Suspend
Mode
Masked by CKE
D1 D2 D3
Frozen Int. CLK by CKE
(CKE = Fixed Low)
D4
Clock Suspend
Mode
Rev 1.0 / Jul. 2005
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