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| 型號(hào)： | PSD4235G2 |
| 英文描述： | Flash In-System-Programmable Peripherals for 16-Bit MCUs(用于16位MCU的閃速在系統(tǒng)可編程外圍芯片) |
| 中文描述： | Flash在系統(tǒng)可編程外設(shè)的16位微控制器（用于16位微控制器的閃速在系統(tǒng)可編程外圍芯片） |
| 文件頁(yè)數(shù)： | 20/114頁(yè) |
| 文件大?。?/td> | 567K |
| 代理商： | PSD4235G2 |
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PSD4000 Series
Beta Information
16
9.0
The
PSD4000
Functional
Blocks
As shown in Figure 1, the PSD4000 consists of six major types of functional blocks:
Memory Blocks
PLD Blocks
Bus Interface
I/OPorts
Power Management Unit
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 PSD4000 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 PSD4000 contain which memory blocks.
Main Flash
Secondary Flash
Block Size
Device
Flash Size
Sector Size
Sector Size
SRAM
PSD4235G2
512KB
64KB
32KB
8KB
8KB
Table 7. Memory Blocks
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 PSD4000 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 (80C51XA) 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.
9.1.1.2 The Ready/Busy Pin (PE4)
Pin PE4 can be used to output the Ready/Busy status of the PSD4000. The output on the
pin will be a ‘0’ (Busy) when Flash memory blocks are being written to,
or
when the Flash
memory block is being erased. The output will be a ‘1’ (Ready) when no write or erase
operation is in progress.
相關(guān)PDF資料 |
PDF描述 |
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| PSD4235G2 | FLASH IN-SYSTEM PROGRAMMABLE (ISP) PERIPHERALS FOR 16-BIT MCUS (5V SUPPLY) |
| PSD4235G2V | -200V 100kRad Hi-Rel Single P-Channel TID Hardened MOSFET in a TO-254AA package; A JANSR2N7426 with Standard Packaging |
| PSD4235G1-B-12J | Flash In-System Programmable ISP Peripherals For 16-bit MCUs 5V Supply |
| PSD4235F2-A-12J | Flash In-System Programmable ISP Peripherals For 16-bit MCUs 5V Supply |
| PSD4235G2-A-12J | Flash In-System Programmable ISP Peripherals For 16-bit MCUs 5V Supply |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PSD4235G2-70U | 功能描述:SPLD - 簡(jiǎn)單可編程邏輯器件 5.0V 4M 70ns RoHS:否 制造商:Texas Instruments 邏輯系列:TICPAL22V10Z 大電池?cái)?shù)量:10 最大工作頻率:66 MHz 延遲時(shí)間:25 ns 工作電源電壓:4.75 V to 5.25 V 電源電流:100 uA 最大工作溫度:+ 75 C 最小工作溫度:0 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:DIP-24 |
| PSD4235G2-90U | 功能描述:CPLD - 復(fù)雜可編程邏輯器件 5.0V 4M 90ns RoHS:否 制造商:Lattice 系列: 存儲(chǔ)類型:EEPROM 大電池?cái)?shù)量:128 最大工作頻率:333 MHz 延遲時(shí)間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100 |
| PSD4235G2-90UI | 功能描述:CPLD - 復(fù)雜可編程邏輯器件 5.0V 4M 90ns RoHS:否 制造商:Lattice 系列: 存儲(chǔ)類型:EEPROM 大電池?cái)?shù)量:128 最大工作頻率:333 MHz 延遲時(shí)間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100 |
| PSD4235G2V-12UI | 功能描述:CPLD - 復(fù)雜可編程邏輯器件 3.3V 4M 120ns RoHS:否 制造商:Lattice 系列: 存儲(chǔ)類型:EEPROM 大電池?cái)?shù)量:128 最大工作頻率:333 MHz 延遲時(shí)間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100 |
| PSD4235G2V-90U | 功能描述:CPLD - 復(fù)雜可編程邏輯器件 3.3V 4M 90ns RoHS:否 制造商:Lattice 系列: 存儲(chǔ)類型:EEPROM 大電池?cái)?shù)量:128 最大工作頻率:333 MHz 延遲時(shí)間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100 |
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