PSD935G2-90U STMicroelectronics, PSD935G2-90U Datasheet - Page 18

• Manufacturer Part Number: PSD935G2-90U
• Manufacturer: STMicroelectronics

Specifications of PSD935G2-90U

• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Package Type: TQFP
• Mounting: Surface Mount
• Pin Count: 80
• Lead Free Status / RoHS Status: Compliant

PSD935G2
The
PSD935G2
Functional
Blocks
(cont.)
9.1.1.4 Memory Operation
The main Flash and secondary Flash memories are addressed through the microcontroller
interface on the PSD935G2 device. The microcontroller can access these memories in one
of two ways:
Typically, Flash memory can be read by the microcontroller using read operations, just
as it would read a ROM device. However, Flash memory can only be erased and
programmed with specific instructions. For example, the microcontroller cannot write a
single byte directly to Flash memory as one would write a byte to RAM. To program a byte
into Flash memory, the microcontroller must execute a program instruction sequence, then
test the status of the programming event. This status test is achieved by a read
operation or polling the Rdy/Busy pin (PE4).
The Flash memory can also be read by using special instructions to retrieve particular
Flash device information (sector protect status and ID).
9.1.1.4.1 Instructions
An instruction is defined as a sequence of specific operations. Each received byte is
sequentially decoded by the PSD and not executed as a standard write operation. The
instruction is executed when the correct number of bytes are properly received and the
time between two consecutive bytes is shorter than the time-out value. Some instructions
are structured to include read operations after the initial write operations.
The sequencing of any instruction must be followed exactly. Any invalid combination of
instruction bytes or time-out between two consecutive bytes while addressing Flash
memory will reset the device logic into a read array mode (Flash memory reads like a
ROM device).
The PSD935G2 main Flash and secondary Flash support these instructions (see Table 8):
These instructions are detailed in Table 8. For efficient decoding of the instructions, the
first two bytes of an instruction are the coded cycles and are followed by a command byte
or confirmation byte. The coded cycles consist of writing the data AAh to address X555h
during the first cycle and data 55h to address XAAAh during the second cycle (unless the
Bypass Instruction feature is used. See 9.1.1.7). Address lines A15-A12 are don’t care
during the instruction write cycles. However, the appropriate sector select signal (FSi or
CSBOOTi) must be selected.
The main Flash and the secondary Flash Block have the same set of instructions (except
Read main Flash ID). The chip selects of the Flash memory will determine which Flash will
receive and execute the instruction. The main Flash is selected if any one of the FS0-7 is
active, and the secondary Flash Block is selected if any one of the CSBOOT0-3 is active.
The microcontroller can execute a typical bus write or read operation just as it would
if accessing a RAM or ROM device using standard bus cycles.
The microcontroller can execute a specific instruction that consists of several write
and read operations. This involves writing specific data patterns to special addresses
within the Flash to invoke an embedded algorithm. These instructions are summarized
in Table 8.
Erase memory by chip or sector
Suspend or resume sector erase
Program a byte
Reset to read array mode
Read Main Flash Identifier value
Read sector protection status
Bypass Instruction
PSD9XX Family
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