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參數(shù)資料
| 型號： | S71PL032J40-07 |
| 廠商： | Spansion Inc. |
| 英文描述： | STACKED MULTI CHIP PRODUCT FLASH MEMORY AND RAM |
| 中文描述： | 堆疊式多芯片產(chǎn)品，閃存和RAM |
| 文件頁數(shù)： | 188/196頁 |
| 文件大?。?/td> | 5729K |
| 代理商： | S71PL032J40-07 |
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188
pSRAM Type 1
pSRAM_Type01_12_A0 June 8, 2004
A d v a n c e I n f o r m a t i o n
Power Savings Modes (For 16M Page Mode, 32M and 64M Only)
There are several power savings modes.
Partial Array Self Refresh
Temperature Compensated Refresh (64M)
Deep Sleep Mode
Reduced Memory Size (32M, 16M)
The operation of the power saving modes ins controlled by the settings of bits
contained in the Mode Register. This definition of the Mode Register is shown in
Figure 93 and the various bits are used to enable and disable the various low
power modes as well as enabling Page Mode operation. The Mode Register is set
by using the timings defined in Figure xxx.
Partial Array Self Refresh (PAR)
In this mode of operation, the internal refresh operation can be restricted to a
16Mb, 32Mb, or 48Mb portion of the array. The array partition to be refreshed is
determined by the respective bit settings in the Mode Register. The register set-
tings for the PASR operation are defined in Table xxx. In this PASR mode, when
ZZ# is active low, only the portion of the array that is set in the register is re-
freshed. The data in the remainder of the array will be lost. The PASR operation
mode is only available during standby time (ZZ# low) and once ZZ# is returned
high, the device resumes full array refresh. All future PASR cycles will use the
contents of the Mode Register that has been previously set. To change the ad-
dress space of the PASR mode, the Mode Register must be reset using the
previously defined procedures. For PASR to be activated, the register bit, A4Must
be set to a one (1) value, “PASR Enabled”. If this is the case, PASR will be acti-
vated 10 μs after ZZ# is brought low. If the A4 register bit is set equal to zero
(0), PASR will not be activated.
Temperature Compensated Refresh (for 64Mb)
In this mode of operation, the internal refresh rate can be optimized for the op-
eration temperature used and this can then lower standby current. The DRAM
array in the PSRAM must be refreshed internally on a regular basis. At higher
temperatures, the DRAM cell must be refreshed more often than at lower tem-
peratures. By setting the temperature of operation in the Mode Register, this
refresh rate can be optimized to yield the lowest standby current at the given op-
erating temperature. There are four different temperature settings that can be
programmed in to the PSRAM. These are defined in Figure 93.
Deep Sleep Mode
In this mode of operation, the internal refresh is turned off and all data integrity
of the array is lost. Deep Sleep is entered by bringing ZZ# low with the A4 reg-
ister bit set to a zero (0), “Deep Sleep Enabled”. If this is the case, Deep Sleep
will be entered 10 μs after ZZ# is brought low. The device will remain in this mode
as long as ZZ# remains low. If the A4 register bit is set equal to one (1), Deep
Sleep will not be activated.
Reduced Memory Size (for 32M and 16M)
In this mode of operation, the 32Mb PSRAM can be operated as a 8Mb or 16Mb
device. The mode and array size are determined by the settings in the VA register.
The VA register is set according to the following timings and the bit settings in
the table “Address Patterns for RMS”. The RMS mode is enabled at the time of ZZ
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