HYE18P32161AC Datasheet, PDF (13/33 Pages) Infineon Technologies AG – 32M Asynchronous/Page CellularRAM

HYE18P32161AC(-/L)70/85
32M Asynch/Page CellularRAM
Overview
1.6
Commands
All commands are of asynchronous nature. The supported control signal combinations are listed in the table below.
C
Table 3
Asynchronous Command Table
Operation Mode
READ
WRITE
SET CONTROL
REGISTER
NO OPERATION
DESELECT
DPD
Power Mode
Active
Active
Active
Standby~Active³⁾
Standby
Deep Power Down
CS1 WE OE UB/LB ZZ A19 A20 - A0
LHL
L¹⁾
HV
ADR
L
L
X²⁾
L¹⁾
HV
ADR
L
L
X²⁾
X
L L RCR DIN
L HH
X
HX
X
HXX
X
XX
X
HXX
X
LX
X
DQ15:0
DOUT
DIN
X
High-Z
High-Z
High-Z
1) Table 3 reflects the behaviour if UB and LB are asserted to low. If only either of the signals, UB or LB, is asserted to low
only the corresponding data byte will be output or written (UB enables DQ15 - DQ8, LB enables DQ7 - DQ0).
2) During a write access invoked by WE set to low the OE signal is ignored.
3) Stand-by power mode applies only to the case when CS goes low from DESELECT while no address change occurs.
Toggling address results in active power mode. Also, NO OPERATION from any active power mode by keeping CS low
consumes the power higher than stand-by mode.
Note: ‘L’ represents a low voltage level, ‘H’ a high voltage level, ‘X’ represents “Don’t Care”, ‘V’ represents “Valid”.
Table 4 Description of Commands
Mode
Description
READ
The READ command is used to perform an asynchronous read cycle. The
signals, UB and LB, define whether only the lower, the upper or the whole 16-bit
word is output.
WRITE
The WRITE command is used to perform an asynchronous write cycle. The data
is latched on the rising edge of either CS, WE, UB, LB, whichever comes first.
The signals, UB and LB, define whether only the lower, the upper or the whole
16-bit word is latched into the CellularRAM.
SET CONTROL REGISTER
The control registers are loaded via the address inputs A15 - A0 performing an
asynchronous write access. Please refer to the control register description for
details. The SCR command can only be issued when the CellularRAM is in idle
state.
NO OPERATION
The NOP command is used to perform a no operation to the CellularRAM, which
is selected (CS1 = 0). Operations already in progress are not affected. Power
consumption of this command mode varies by address change and initiating
condition.
DESELECT
The DESELECT function prevents new commands from being executed by the
CellularRAM. The CellularRAM is effectively deselected. I/O signals are put to
high impedance state.
DPD
DPD stops all refresh-related activities and entire on-chip circuit operation.
Current consumption drops below 25 µA. Wake-up from DPD also requires
150 µs to get ready for normal operation.
Note: ‘L’ represents a low voltage level, ‘H’ a high voltage level, ‘X’ represents “Don’t Care”, ‘V’ represents “Valid”.
Data Sheet
13
V2.0, 2003-12-16