参数资料
型号: LC4032ZE-7TN48I
厂商: LATTICE SEMICONDUCTOR CORP
元件分类: PLD
中文描述: EE PLD, 7.5 ns, PQFP48
封装: LEAD FREE, TQFP-48
文件页数: 7/60页
文件大小: 1381K
代理商: LC4032ZE-7TN48I
Lattice Semiconductor
ispMACH 4000ZE Family Data Sheet
15
Some Simple Use Scenarios
The following diagrams show a few simple examples that omit optional signals for the OSCTIMER block:
A. An oscillator giving 5MHz nominal clock
B. An oscillator that can be disabled with an external signal (5MHz nominal clock)
C. An oscillator giving approximately 5 Hz nominal clock (TIMER_DIV = 2
20 (1,048,576))
D. An oscillator giving two output clocks: ~5MHz and ~5KHz (TIMER_DIV= 2
10 (1,024))
OSCTIMER Integration With CPLD Fabric
The OSCTIMER is integrated into the CPLD fabric using the Global Routing Pool (GRP). The macrocell (MC) feed-
back path for two macrocells is augmented with a programmable multiplexer, as shown in Figure 15. The OSC-
TIMER outputs (OSCOUT and TIMEROUT) can optionally drive the GRP lines, whereas the macrocell outputs can
drive the optional OSCTIMER inputs TIMERRES and DYNOSCDIS.
Figure 15. OSCTIMER Integration With CPLD Fabric
Table 12 shows how these two MCs are designated in each of the ispMACH4000ZE device.
OSCTIME R
TI ME R_DIV= N /A
OSCOUT
(A) A simple 5MHz oscillator.
(B) An oscillator with dynamic disable.
(D) Oscillator with two outputs (5MHz and 5KHz).
(C) A simple 5Hz oscillator.
DYNOS CD IS
OSCTIME R
TI ME R_DIV= N /A
OSCOUT
OSCTIME R
TI ME R_DIV= 2
20
TIMEROUT
OSCTIME R
TI ME R_DIV= 2
10
OSCOUT
TIMEROUT
1
0
1
0
1
0
1
0
A Regular Macrocell
OSC Macrocell
TIMER Macrocell
To GRP
Macrocell
Feedback
Signal
Macrocell 15
Feedback
Signal
OSCOUT
DYNOSCDIS
TIMEROUT
TIMERRES
Macrocell 15
Feedback
Signal
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