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SST34HF1642D-70-4E-L1PE Datasheet(PDF) 6 Page - Silicon Storage Technology, Inc |
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SST34HF1642D-70-4E-L1PE Datasheet(HTML) 6 Page - Silicon Storage Technology, Inc |
6 / 38 page 6 Advance Information 16 Mbit Concurrent SuperFlash + 2/4/8 Mbit SRAM ComboMemory SST34HF1602C / SST34HF1622C / SST34HF1642C SST34HF1642D / SST34HF1682D / SST34HF1622S / SST34HF1642S ©2004 Silicon Storage Technology, Inc. S71256-00-000 3/04 Product Identification The Product Identification mode identifies the device as the SST34HF16x2C/D/S and manufacturer as SST. This mode may be accessed by software operations only. The hardware device ID Read operation, which is typically used by programmers cannot be used on this device because of the shared lines between flash and (P)SRAM in the multi- chip package. Therefore, application of high voltage to pin A9 may damage this device. Users may use the software Product Identification operation to identify the part (i.e., using the device ID) when using multiple manufacturers in the same socket. For details, see Tables 4 and 7 for soft- ware operation, Figure 16 for the Software ID Entry and Read timing diagram and Figure 24 for the ID Entry com- mand sequence flowchart. Note: BK = Bank Address (A19-A18) Product Identification Mode Exit In order to return to the standard Read mode, the Software Product Identification mode must be exited. Exit is accom- plished by issuing the Software ID Exit command sequence, which returns the device to the Read mode. This command may also be used to reset the device to the Read mode after any inadvertent transient condition that apparently causes the device to behave abnormally, e.g., not read correctly. Please note that the Software ID Exit command is ignored during an internal Program or Erase operation. See Table 7 for software command codes, Fig- ure 17 for timing waveform and Figure 24 for a flowchart. (P)SRAM Operation With BES1# low, BES2 and BEF# high, the SST34HF16x2C/D/S operate as either 128K x16, 256K x16, or 512K x16 CMOS (P)SRAM, with fully static opera- tion requiring no external clocks or timing strobes. The SST34HF16x2C/D/S (P)SRAM is mapped into the first 512 KWord address space. When BES1#, BEF# are high and BES2 is low, all memory banks are deselected and the device enters standby. Read and Write cycle times are equal. The control signals UBS# and LBS# provide access to the upper data byte and lower data byte (UBS# and LBS# signals are NC for SST3416x2S parts). See Table 4 for x16 (P)SRAM Read and Write data byte control modes of operation. See Table 5 for x8 SRAM Read and Write data byte control modes of operation. (P)SRAM Read The (P)SRAM Read operation of the SST34HF16x2C/D/S is controlled by OE# and BES1#, both have to be low with WE# and BES2 high for the system to obtain data from the outputs. BES1# and BES2 are used for (P)SRAM bank selection. OE# is the output control and is used to gate data from the output pins. The data bus is in high imped- ance state when OE# is high. Refer to the Read cycle tim- ing diagram, Figure 5, for further details. (P)SRAM Write The (P)SRAM Write operation of the SST34HF16x2C/D/S is controlled by WE# and BES1#, both have to be low, BES2 must be high for the system to write to the (P)SRAM. During the Word-Write operation, the addresses and data are referenced to the rising edge of either BES1#, WE#, or the falling edge of BES2 whichever occurs first. The write time is measured from the last falling edge of BES#1 or WE# or the rising edge of BES2 to the first rising edge of BES1#, or WE# or the falling edge of BES2. Refer to the Write cycle timing diagrams, Figures 6 and 7, for further details. TABLE 2: PRODUCT IDENTIFICATION ADDRESS DATA Manufacturer’s ID BK0000H 00BFH Device ID SST34HF16x2C/D/S BK0001H 734AH T2.0 1256 |
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