EtronTech
EM636327
10 Block Write and AutoPrecharge command
(RAS# = "H", CAS# = "L", WE# = "H", DSF = "H", BS = Bank, A9 = "H", A3-A7 = Column Address,
DQ0-DQ31 = Column Mask)
The Block Write and AutoPrecharge command performs the precharge operation automatically
after the block write operation. Once this command is given, any subsequent command can not
occur within a time delay of {tBPL + tRP(min.)}.
11 Mode Register Set command
(RAS# = "L", CAS# = "L", WE# = "L", DSF = "L", BS, A0-A9 = Register Data)
The mode register stores the data for controlling the various operating modes of SGRAM. The
Mode Register Set command programs the values of CAS# latency, Addressing Mode and Burst
Length in the Mode register to make SGRAM useful for a variety of different applications. The
default values of the Mode Register after power-up are undefined; therefore this command must be
issued at the power-up sequence. The state of pins A0~A8 and BS in the same cycle is the data
written to the mode register. One clock cycle is required to complete the write in the mode register
(refer to the following figure). The contents of the mode register can be changed using the same
command and the clock cycle requirements during operation as long as both banks are in the idle
state.
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
CLK
t
CK2
CKE
CS#
Clock min.
RAS#
CAS#
WE#
DSF
BS
A 9
Address Key
A0-A8
DQM
RP
t
Hi-Z
DQ
Mode Register
Set Command
PrechargeAll
Any
Command
Mode Register Set Cycle
(CAS# Latency = 1, 2, 3)
Preliminary
1998
December
14
ETRON [ ETRON TECHNOLOGY, INC. ]
