参数资料
型号: M4-256/128-12YC
厂商: LATTICE SEMICONDUCTOR CORP
元件分类: PLD
英文描述: High Performance E 2 CMOS In-System Programmable Logic
中文描述: EE PLD, 12 ns, PQFP208
封装: PLASTIC, QFP-208
文件页数: 5/46页
文件大小: 754K
代理商: M4-256/128-12YC
MACH 4 Family
13
A reset/preset swapping feature in each macrocell allows for reset and preset to be exchanged,
providing exibility. In asynchronous mode (Figure 8), a single individual product term is
provided for initialization. It can be selected to control reset or preset.
Note that the reset/preset swapping selection feature effects power-up reset as well. The
initialization functionality of the ip-ops is illustrated in Table 9. The macrocell sends its data
to the output switch matrix and the input switch matrix. The output switch matrix can route this
data to an output if so desired. The input switch matrix can send the signal back to the central
switch matrix as feedback.
Note:
1. Transparent latch is unaffected by AR, AP
Table 9. Asynchronous Reset/Preset Operation
AR
AP
CLK/LE1
Q+
00X
See Table 8
01X1
10X0
11X0
Power-Up
Reset
AP
D/L/T
AR
Q
Individual
Reset
Product Term
a. Reset
Power-Up
Preset
AP
D/L/T
AR
Q
Individual
Preset
Product Term
b. Preset
17466G-014
17466G-015
Figure 8. Asynchronous Mode Initialization Congurations
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