參數(shù)資料
型號: M7A3PE600-FFGG484I
元件分類: FPGA
英文描述: FPGA, 600000 GATES, PBGA484
封裝: 1 MM PITCH, GREEN, FBGA-484
文件頁數(shù): 18/168頁
文件大?。?/td> 1335K
代理商: M7A3PE600-FFGG484I
ProASIC3E Flash Family FPGAs
3- 46
Advanced v0.5
Differential I/O Characteristics
Physical Implementation
Configuration of the I/O modules as a differential pair is
handled by the Actel Designer software when the user
instantiates a differential I/O macro in the design.
Differential I/Os can also be used in conjunction with the
embedded Input Register (InReg), Output Register
(OutReg), Enable Register (EnReg), and Double Data
Rate
(DDR).
However,
there
is
no
support
for
bidirectional I/Os or tristates with the LVPECL standards.
LVDS
Low-Voltage Differential Signal (ANSI/TIA/EIA-644) is a
high-speed, differential I/O standard. It requires that one
data bit is carried through two signal lines; so two pins
are needed. It also requires external resistor termination.
The full implementation of the LVDS transmitter and
receiver is shown in an example in Figure 3-21. The
building blocks of the LVDS transmitter-receiver are one
transmitter macro, one receiver macro, three board
resistors at the transmitter end, and one resistor at the
receiver end. The values for the three driver resistors are
different from those used in the LVPECL implementation,
because the output standard specifications are different.
Along with the LVDS I/O, ProASIC3E also will support
BusLVDS
structure
and
Multi-Drop
LVDS
(M-LVDS)
configuration (up to 40 nodes).
Figure 3-21 LVDS Circuit Diagram and Board-Level Implementation
Table 3-74 Minimum and Maximum DC Input and Output Levels
DC Parameter
Description
Min.
Typ.
Max.
Units
VCCI
Supply Voltage
2.375
2.5
2.625
V
VOL
Output Low Voltage
0.9
1.075
1.25
V
VOH
Output High Voltage
1.25
1.425
1.6
V
VI
Input Voltage
0
2.925
V
VODIFF
Differential Output Voltage
250
350
450
mV
VOCM
Output Common Mode Voltage
1.125
1.25
1.375
V
VICM
Input Common Mode Voltage
0.05
1.25
2.35
V
VIDIFF
Input Differential Voltage
100
350
mV
Notes:
1. +/- 5%
2. Differential input voltage = +/-350mV
Table 3-75 AC Waveforms, Measuring Points, and Capacitive Loads
Input Low (V)
Input High (V)
Measuring Point* (V)
VREF (Typ) (V)
1.075
1.325
Cross point
Note: *Measuring point = Vtrip. See Table 3-15 on page 3-17 for a complete table of trip points.
140
100
ZO = 50
ZO = 50
165
165
+
-
P
N
P
N
INBUF_LVDS
OUTBUF_LVDS
FPGA
Bourns Part Number: CAT16-LV4F12
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