參數(shù)資料
型號(hào): M4A3-256/128-10VI
廠商: LATTICE SEMICONDUCTOR CORP
元件分類(lèi): PLD
英文描述: High Performance E 2 CMOS In-System Programmable Logic
中文描述: EE PLD, 10 ns, PQFP176
封裝: TQFP-176
文件頁(yè)數(shù): 8/61頁(yè)
文件大小: 1169K
代理商: M4A3-256/128-10VI
16
MACH 4 Family
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 13. 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
Output Switch Matrix
The output switch matrix allows macrocells to be connected to any of several I/O cells within a
PAL block. This provides high exibility in determining pinout and allows design changes to
occur without effecting pinout.
In MACH 4 and MACH 4A devices with 2:1 Macrocell-I/O cell ratio, each PAL block has twice as
many macrocells as I/O cells. The MACH 4 output switch matrix allows for half of the macrocells
to drive I/O cells within a PAL block, in combinations according to Figure 9. Each I/O cell can
choose from eight macrocells; each macrocell has a choice of four I/O cells. The MACH 4 and
MACH 4A devices with 1:1 Macrocell-I/O cell ratio allow each macrocell to drive one of eight
I/O cells (Figure 9).
Table 13. Asynchronous Reset/Preset Operation
AR
AP
CLK/LE1
Q+
0
X
See Table 12
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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