1. Polarity of CLK/LE can be programmed Although the macrocell shows only one input to the register, the XOR gate in" />
參數(shù)資料
型號: M4A3-96/48-55VC
廠商: Lattice Semiconductor Corporation
文件頁數(shù): 4/62頁
文件大?。?/td> 0K
描述: IC CPLD ISP 4A 96MC 100TQFP
標準包裝: 90
系列: ispMACH® 4A
可編程類型: 系統(tǒng)內(nèi)可編程
最大延遲時間 tpd(1): 5.5ns
電壓電源 - 內(nèi)部: 3 V ~ 3.6 V
宏單元數(shù): 96
輸入/輸出數(shù): 48
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 100-LQFP
供應(yīng)商設(shè)備封裝: 100-TQFP(14x14)
包裝: 托盤
12
ispMACH 4A Family
Note:
1. Polarity of CLK/LE can be programmed
Although the macrocell shows only one input to the register, the XOR gate in the logic allocator allows the
D-, T-type register to emulate J-K, and S-R behavior. In this case, the available product terms are divided
between J and K (or S and R). When configured as J-K, S-R, or T-type, the extra product term must be used
on the XOR gate input for flip-flop emulation. In any register type, the polarity of the inputs can be
programmed.
The clock input to the flip-flop can select any of the four PAL block clocks in synchronous mode, with the
additional choice of either polarity of an individual product term clock in the asynchronous mode.
The initialization circuit depends on the mode. In synchronous mode (Figure 7), asynchronous reset and
preset are provided, each driven by a product term common to the entire PAL block.
Table 8. Register/Latch Operation
Conguration
Input(s)
CLK/LE 1
Q+
D-type Register
D=X
D=0
D=1
0,1, ↓ (↑)
↑ (↓)
Q
0
1
T-type Register
T=X
T=0
T=1
0, 1, ↓ (↑)
↑ (↓)
Q
D-type Latch
D=X
D=0
D=1
1(0)
0(1)
Q
0
1
Power-Up
Reset
AP
D/T/L
AR
Q
PAL-Block
Initialization
Product Terms
a. Power-up reset
Power-Up
Preset
AP
D/L
PAL-Block
Initialization
Product Terms
AR
Q
17466G-012
17466G-013
Figure 7. Synchronous Mode Initialization Congurations
b. Power-up preset
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