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PSD804F2V-A-20B81 View Datasheet(PDF) - STMicroelectronics

Part NamePSD804F2V-A-20B81 ST-Microelectronics
STMicroelectronics ST-Microelectronics
DescriptionConfigurable Memory System on a Chip for 8-Bit Microcontrollers
PSD804F2V-A-20B81 Datasheet PDF : 110 Pages
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PSD8XX Family
9.0
The
PSD835G2
Functional
Blocks
PSD835G2
As shown in Figure 1, the PSD835G2 consists of six major types of functional blocks:
t Memory Blocks
t PLD Blocks
t Bus Interface
t I/O Ports
t Power Management Unit
t JTAG-ISP Interface
The functions of each block are described in the following sections. Many of the blocks
perform multiple functions, and are user configurable.
9.1 Memory Blocks
The PSD835G2 has the following memory blocks:
The main Flash memory
Secondary Flash memory
SRAM.
The memory select signals for these blocks originate from the Decode PLD (DPLD) and
are user-defined in PSDsoft.
Table 7 summarizes which versions of the PSD835G2 contain which memory blocks.
Table 7. Memory Blocks
Device
Main Flash
Flash Size
Sector Size
PSD835G2
512KB
64KB
Secondary Flash
Block Size Sector Size
32KB
8KB
SRAM
8KB
9.1.1 Main Flash and Secondary Flash Memory Description
The main Flash memory block is divided evenly into eight sectors. The secondary Flash
memory is divided into four sectors of eight Kbytes each. Each sector of either memory
can be separately protected from program and erase operations.
Flash memory may be erased on a sector-by-sector basis and programmed word-by-word.
Flash sector erasure may be suspended while data is read from other sectors of memory
and then resumed after reading.
During a program or erase of Flash, the status can be output on the Rdy/Bsy pin of Port
PE4. This pin is set up using PSDsoft.
9.1.1.1 Memory Block Selects
The decode PLD in the PSD835G2 generates the chip selects for all the internal memory
blocks (refer to the PLD section). Each of the eight Flash memory sectors have a
Flash Select signal (FS0-FS7) which can contain up to three product terms. Each of the
four Secondary Flash memory sectors have a Select signal (CSBOOT0-3) which can
contain up to three product terms. Having three product terms for each sector select signal
allows a given sector to be mapped in different areas of system memory. When using a
microcontroller (80C51) with separate Program and Data space, these flexible select
signals allow dynamic re-mapping of sectors from one space to the other before and after
IAP.
16
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