參數(shù)資料
型號(hào): ZPSD503B1V
英文描述: Field Programmable Microcontroller Peripherals(可編程邏輯,零功耗,16K位SRAM,40個(gè)可編程I/O,通用PLD有61個(gè)輸入)
中文描述: 現(xiàn)場(chǎng)可編程微控制器外圍設(shè)備(可編程邏輯,零功耗,16K的位的SRAM,40余個(gè)可編程輸入/輸出,通用PLD的有61個(gè)輸入)
文件頁(yè)數(shù): 16/142頁(yè)
文件大?。?/td> 786K
代理商: ZPSD503B1V
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ZPSD5XX Famly
7-16
ZPLDBlock
(Cont.)
Port A Macrocell Structure
Figure 5a shows the PA Macrocell block, which consists of 8 identical macrocells.
Each macrocell output can be connected to its own I/O pin on Port A. There are 3 user
programmable global product terms output from the GPLD’s AND ARRAY which are
shared by all the macrocells in Port A:
J
PA.OE
Enable or tri-state Port A output pins
J
PA.PR
Preset D flip flop in the macrocells
J
PA.RE
Reset/Clear D flip flop in the macrocells
Two other inputs, CLKIN and MACRO-RST, are used as clock and clear inputs to the D flip
flop. 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 Port A Macrocell is shown in Figure 7. There are 6 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 A pin as dedicated input
J
GPLD Output
Use Port A pin as dedicated output
J
GPLD I/O
Use Port A pin as bidirectional pin
J
Macrocell Feedback
Register feedback for state machine implementations or expander feedback
from the combinatorial output, to 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 A pin, Port A can be configured to perform other user defined I/O functions.
The two global product terms assigned for asynchronous clear (PA.RE) and preset (PA.PR)
are mainly for proper Port A Macrocell initialization. The macrocell flip-flop can also be
cleared during reset by MACRO-RST, if such an option is chosen. The clock source is
always the input clock CLKIN.
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