參數(shù)資料
型號: ISPMACH4ACPLDFAMILY
廠商: Lattice Semiconductor Corporation
英文描述: High Performance E 2 CMOS In-System Programmable Logic
中文描述: 高的E 2的CMOS在系統(tǒng)可編程邏輯
文件頁數(shù): 19/62頁
文件大小: 1180K
代理商: ISPMACH4ACPLDFAMILY
ispMACH 4A Family
19
PAL Block Clock Generation
Each ispMACH 4A device has four clock pins that can also be used as inputs. These pins drive
a clock generator in each PAL block (Figure 14). The clock generator provides four clock signals
that can be used anywhere in the PAL block. These four PAL block clock signals can consist of
a large number of combinations of the true and complement edges of the global clock signals.
Table 14 lists the possible combinations.
1. M4A(3,5)-32/32 and M4A(3,5)-64/32 have only two clock pins, GCLK0 and GCLK1.GCLK2 is tied to GCLK0, and GCLK3 is
tied to GCLK1.
Note:
1. Values in parentheses are for the M4A(3,5)-32/32 and M4A(3,5)-64/32.
This feature provides high flexibility for partitioning state machines and dual-phase clocks. It
also allows latches to be driven with either polarity of latch enable, and in a master-slave
configuration.
Table 14. PAL Block Clock Combinations
1
Block CLK0
Block CLK1
Block CLK2
Block CLK3
GCLK0
GCLK1
GCLK0
GCLK1
X
X
X
X
GCLK1
GCLK1
GCLK0
GCLK0
X
X
X
X
X
X
X
X
GCLK2 (GCLK0)
GCLK3 (GCLK1)
GCLK2 (GCLK0)
GCLK3 (GCLK1)
X
X
X
X
GCLK3 (GCLK1)
GCLK3 (GCLK1)
GCLK2 (GCLK0)
GCLK2 (GCLK0)
GCLK0
GCLK1
GCLK2
GCLK3
Block CLK0
(GCLK0 or GCLK1)
Block CLK1
(GCLK1 or GCLK0)
Block CLK2
(GCLK2 or GCLK3)
Block CLK3
(GCLK3 or GCLK2)
17466G-004
Figure 14. PAL Block Clock Generator
1
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