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参数资料
| 型号： | PSD833F2-15M |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 1M X 1 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQFP52 |
| 封装： | PLASTIC, QFP-52 |
| 文件页数： | 59/122页 |
| 文件大小： | 489K |
| 代理商： | PSD833F2-15M |
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Preliminary Information
PSD8XXF Family
37
9.2.2.2 The Product Term Allocator
The CPLD has a Product Term Allocator. The PSDabel compiler uses the Allocator to
borrow and place product terms from one Micro
Cell to another. The following list
summarizes how product terms are allocated:
McellAB0-7 all have three native product terms and may borrow up to six more
McellBC0-3 all have four native product terms and may borrow up to five more
McellBC4-7 all have four native product terms and may borrow up to six more.
Each Micro
Cell may only borrow product terms from certain other MicroCells. Product
terms already in use by one Micro
Cell will not be available for a different MicroCell.
If an equation requires more product terms than what is available to it, then “external”
product terms will be required, which will consume other OMCs. If external product terms
are used, extra delay will be added for the equation that required the extra product terms.
This is called product term expansion. PSDsoft will perform this expansion as needed.
9.2.2.3 Loading and Reading the Output Micro
Cells (OMCs)
The OMCs occupy a memory location in the MCU address space, as defined by the
CSIOP (refer to the I/O section). The flip-flops in each of the 16 OMCs can be loaded from
the data bus by a microcontroller. Loading the OMCs with data from the MCU takes priority
over internal functions. As such, the preset, clear, and clock inputs to the flip-flop can be
overridden by the MCU. The ability to load the flip-flops and read them back is useful in
such applications as loadable counters and shift registers, mailboxes, and handshaking
protocols.
Data can be loaded to the OMCs on the trailing edge of the WR signal (edge loading) or
during the time that the WR signal is active (level loading). The method of loading is
specified in PSDsoft Configuration.
9.2.2.4 The OMC Mask Register
There is one Mask Register for each of the two groups of eight OMCs. The Mask Registers
can be used to block the loading of data to individual OMCs. The default value for the
Mask Registers is 00h, which allows loading of the OMCs. When a given bit in a Mask
Register is set to a ‘1’, the MCU will be blocked from writing to the associated OMC. For
example, suppose McellAB0-3 are being used for a state machine. You would not want a
MCU write to McellAB to overwrite the state machine registers. Therefore, you would want
to load the Mask Register for McellAB (Mask Micro
Cell AB) with the value 0Fh.
9.2.2.5 The Output Enable of the OMC
The OMC can be connected to an I/O port pin as a PLD output. The output enable of each
Port pin driver is controlled by a single product term from the AND array, ORed with the
Direction Register output. The pin is enabled upon power up if no output enable equation
is defined and if the pin is declared as a PLD output in PSDsoft.
If the OMC output is declared as an internal node and not as a Port pin output in the
PSDabel file, then the Port pin can be used for other I/O functions. The internal node
feedback can be routed as an input to the AND array.
The
PSD8XXF
Functional
Blocks
(cont.)
相关PDF资料 |
PDF描述 |
|---|---|
| PSD835G2V-B-90MI | Configurable Memory System on a Chip for 8-Bit Microcontrollers |
| PSD835G2V-B-90U | Configurable Memory System on a Chip for 8-Bit Microcontrollers |
| PSD835G2V-B-90UI | Configurable Memory System on a Chip for 8-Bit Microcontrollers |
| PSD835G2V-C-12B81I | Configurable Memory System on a Chip for 8-Bit Microcontrollers |
| PSD835G2V-C-12M | Configurable Memory System on a Chip for 8-Bit Microcontrollers |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PSD833F2-90J | 功能描述:CPLD - 复杂可编程逻辑器件 5.0V 1M 90ns RoHS:否 制造商:Lattice 系列: 存储类型:EEPROM 大电池数量:128 最大工作频率:333 MHz 延迟时间:2.7 ns 可编程输入/输出端数量:64 工作电源电压:3.3 V 最大工作温度:+ 90 C 最小工作温度:0 C 封装 / 箱体:TQFP-100 |
| PSD833F2-90JI | 功能描述:SPLD - 简单可编程逻辑器件 5.0V 1M 90ns RoHS:否 制造商:Texas Instruments 逻辑系列:TICPAL22V10Z 大电池数量:10 最大工作频率:66 MHz 延迟时间:25 ns 工作电源电压:4.75 V to 5.25 V 电源电流:100 uA 最大工作温度:+ 75 C 最小工作温度:0 C 安装风格:Through Hole 封装 / 箱体:DIP-24 |
| PSD833F2-90M | 功能描述:SPLD - 简单可编程逻辑器件 5.0V 1M 90ns RoHS:否 制造商:Texas Instruments 逻辑系列:TICPAL22V10Z 大电池数量:10 最大工作频率:66 MHz 延迟时间:25 ns 工作电源电压:4.75 V to 5.25 V 电源电流:100 uA 最大工作温度:+ 75 C 最小工作温度:0 C 安装风格:Through Hole 封装 / 箱体:DIP-24 |
| PSD833F2-90MI | 功能描述:CPLD - 复杂可编程逻辑器件 5.0V 1M 90ns RoHS:否 制造商:Lattice 系列: 存储类型:EEPROM 大电池数量:128 最大工作频率:333 MHz 延迟时间:2.7 ns 可编程输入/输出端数量:64 工作电源电压:3.3 V 最大工作温度:+ 90 C 最小工作温度:0 C 封装 / 箱体:TQFP-100 |
| PSD834F2-15M | 制造商:STMicroelectronics 功能描述:Flash In-System Programmable Peripherals 52-Pin PQFP |
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