ProASICPLUS Flash Family FPGAs v5.9 2-11 The clock conditioning circuit can adva" />
參數資料
型號: APA600-CQ352B
廠商: Microsemi SoC
文件頁數: 93/178頁
文件大?。?/td> 0K
描述: IC FPGA PROASIC+ 600K 352-CQFP
標準包裝: 1
系列: ProASICPLUS
RAM 位總計: 129024
輸入/輸出數: 248
門數: 600000
電源電壓: 2.3 V ~ 2.7 V
安裝類型: 表面貼裝
封裝/外殼: 352-BFCQFP,帶拉桿
供應商設備封裝: 352-CQFP(75x75)
ProASICPLUS Flash Family FPGAs
v5.9
2-11
The clock conditioning circuit can advance or delay the
clock up to 8 ns (in increments of 0.25 ns) relative to the
positive edge of the incoming reference clock. The system
also allows for the selection of output frequency clock
phases of 0° and 180°.
Prior to the application of signals to the rib drivers, they
pass through programmable delay units, one per global
network. These units permit the delaying of global
signals relative to other signals to assist in the control of
input set-up times. Not all possible combinations of input
and output modes can be used. The degrees of freedom
available in the bidirectional global pad system and in
the clock conditioning circuit have been restricted. This
avoids unnecessary and unwieldy design kit and software
work.
Notes:
1. FBDLY is a programmable delay line from 0 to 4 ns in 250 ps increments.
2. DLYA and DLYB are programmable delay lines, each with selectable values 0 ps, 250 ps, 500 ps, and 4 ns.
3. OBDIV will also divide the phase-shift since it takes place after the PLL Core.
Figure 2-11 PLL Block – Top-Level View and Detailed PLL Block Diagram
AVDD
AGND
GND
+
-
VDD
External Feedback Signal
GLA
GLB
Dynamic
Configuration Bits
Flash
Configuration Bits
8
27
4
Clock Conditioning
Circuitry
(Top level view)
Global MUX A OUT
Global MUX B OUT
See Figure 2-15
on page 2-15
Input Pins to the PLL
GLB
GLA
÷u
÷v
PLL Core
180°
0
1
6
7
5
4
2
Delay Line 0.0 ns, 0.25 ns,
0.50 ns and 4.00 ns
P+
P-
Clock from Core
(GLINT mode)
CLK
1
0
Deskew
Delay
2.95 ns
1
2
3
Delay Line
0.25 ns to
4.00 ns,
16 steps,
0.25 ns
increments
3
1
2
Delay Line 0.0 ns, 0.25 ns,
0.50 ns and 4.00 ns
Clock from Core
(GLINT mode)
CLKA
EXTFB
XDLYSEL
Bypass Secondary
Bypass Primary
FIVDIV[4:0]
FBDIV[5:0]
FBSEL[1:0]
OAMUX[1:0]
DLYA[1:0]
DLYB[1:0]
OBDIV[1:0]
OBMUX[2:0]
OADIV[1:0]
FBDLY[3:0]
÷n
÷m
Clock Conditioning Circuitry Detailed Block Diagram
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