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16Mb: 1 Meg x 16 Async/Page/Burst CellularRAM 1.0 Memory
Configuration Registers
Software Access
Software access of the configuration registers uses a sequence of asynchronous READ
and asynchronous WRITE operations. The contents of the configuration registers can be
read or modified using the software sequence.
The configuration registers are loaded using a four-step sequence consisting of two
asynchronous READ operations followed by two asynchronous WRITE operations (see
Figure 15). The read sequence is virtually identical except that an asynchronous READ is
performed during the fourth operation (see Figure 16). Note that a third READ cycle of
the highest address will cancel the access sequence until a different address is read.
The address used during all READ and WRITE operations is the highest address of the
CellularRAM device being accessed (FFFFFh for 16Mb); the content at this address is not
changed by using this sequence.
The data value presented during the third operation (WRITE) in the sequence defines
whether the BCR or the RCR is to be accessed. If the data is 0000h, the sequence will
access the RCR; if the data is 0001h, the sequence will access the BCR. During the fourth
operation, DQ[15:0] transfer data into or out of bits 15–0 of the configuration registers.
The use of the software sequence does not affect the ability to perform the standard
(CRE-controlled) method of loading the configuration registers. However, the software
nature of this access mechanism eliminates the need for the control register enable
(CRE) pin. If the software mechanism is used, the CRE pin can simply be tied to V SS . The
port line often used for CRE control purposes is no longer required.
Software access of the RCR should not be used to enter or exit DPD.
Figure 15:
Load Configuration Register
READ
READ
WRITE
WRITE
ADDRESS
ADDRE SS
(MAX)
ADDRE SS
(MAX)
ADDRE SS
(MAX)
ADDRE SS
(MAX)
CE#
OE#
WE#
Note 0ns (Min)
LB#/UB#
DATA
XXXXh
XXXXh
R C R: 0000h
C R VALUE
IN
DON'T C ARE
B C R: 0001h
Note:
If the data present when WE# falls is not 0000h or 0001h, it is possible that the maximum
address will be overwritten.
PDF: 09005aef81cb58ed/Source: 09005aef81c7a667
16mb_burst_cr1_0_p23z_2.fm - Rev. H 4/08 EN
21
Micron Technology, Inc., reserves the right to change products or specifications without notice.
?2005 Micron Technology, Inc. All rights reserved.
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