參數(shù)資料
型號: PSD402A1
英文描述: Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,40個可編程I/O,通用PLD有37個輸入)
中文描述: 現(xiàn)場可編程微控制器外圍設備(可編程邏輯,16K的位的SRAM,40余個可編程輸入/輸出,通用PLD的有37個輸入)
文件頁數(shù): 29/97頁
文件大?。?/td> 309K
代理商: PSD402A1
PSD4XX Famly
4-29
Port B Macrocell Structure
Figure 15 shows the PB Macrocell block, which consists of 8 identical macrocells. Each
macrocell output can be connected to its own I/O pin on Port B. The two inputs, CLKIN and
MACRO-RST, are used as clock and clear inputs to all the macrocells. The CLKIN comes
directly from the CLKIN input pin. The MACRO-RST is the same as the Reset input pin
except it is user configurable.
The circuit of a PB Macrocell is shown in Figure 16. There are 10 product terms from the
GPLD’s AND ARRAY as inputs to the macrocell. Users can select the polarity of the output,
and configure the macrocell to operate as:
J
Registered Output
Select output from D flip flop.
J
Combinatorial Output
Select output from OR gate.
J
GPLD Input
Use Port B pin as dedicated input.
J
GPLD Output
Use Port B pin as dedicated output.
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GPLD I/O
Use Port B pin as bidirectional pin.
J
Macrocell Feedback
Register feedback for state machine implementations or expander feedback
from the combinatorial output, to possibly expand the number of product terms
available to another macrocell.
In case of "Buried Feedback", where the output of the macrocell is not
connected to a Port B pin, Port B can be configured to perform other user
defined I/O functions.
Each D flip flop in the macrocells has its own dedicated asynchronous clear, preset and
clock input. The signals are defined as follow:
J
PRESET
Active only if defined by a product term (PBx.PR)
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CLEAR
Two selectable inputs: Reset input or user defined product term (PBx .RE)
J
CLK
Two selectable inputs – CLKIN input or user defined product term (PBx.CLK).
The macrocell is operated in Synchronous Mode if the clock input is
CLKIN, and is in Asynchronous Mode if the clock is a product-term clock
defined by the user.
PSD4XXA2
ZPLDBlock
(Cont.)
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