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參數(shù)資料
| 型號(hào)： | XC4020XL-1PQ208I |
| 廠商： | Xilinx Inc |
| 文件頁(yè)數(shù)： | 37/68頁(yè) |
| 文件大小： | 0K |
| 描述： | IC FPGA I-TEMP 3.3V 1SPD 208PQFP |
| 產(chǎn)品變化通告： | XC4000XL/E, XC9500XV, XC3100A Discontinuance 12/Apr/2010 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | XC4000E/X |
| LAB/CLB數(shù)： | 784 |
| 邏輯元件/單元數(shù)： | 1862 |
| RAM 位總計(jì)： | 25088 |
| 輸入/輸出數(shù)： | 160 |
| 門數(shù)： | 20000 |
| 電源電壓： | 3 V ~ 3.6 V |
| 安裝類型： | 表面貼裝 |
| 工作溫度： | -40°C ~ 100°C |
| 封裝/外殼： | 208-BFQFP |
| 供應(yīng)商設(shè)備封裝： | 208-PQFP（28x28） |
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R
XC4000E and XC4000X Series Field Programmable Gate Arrays
6-46
May 14, 1999 (Version 1.6)
Conguration Modes
XC4000E devices have six conguration modes. XC4000X
devices have the same six modes, plus an additional con-
guration mode. These modes are selected by a 3-bit input
code applied to the M2, M1, and M0 inputs. There are three
self-loading Master modes, two Peripheral modes, and a
Serial
Slave
mode,
which
is
used
primarily
for
daisy-chained devices. The coding for mode selection is
shown in Table 18.
A detailed description of each conguration mode, with tim-
ing information, is included later in this data sheet. During
conguration, some of the I/O pins are used temporarily for
the conguration process. All pins used during congura-
tion are shown in Table 22 on page 58.
Master Modes
The three Master modes use an internal oscillator to gener-
ate a Conguration Clock (CCLK) for driving potential slave
devices. They also generate address and timing for exter-
nal PROM(s) containing the conguration data.
Master Parallel (Up or Down) modes generate the CCLK
signal and PROM addresses and receive byte parallel data.
The data is internally serialized into the FPGA data-frame
format. The up and down selection generates starting
addresses at either zero or 3FFFF (3FFFFF when 22
address lines are used), for compatibility with different
microprocessor addressing conventions. The Master Serial
mode generates CCLK and receives the conguration data
in serial form from a Xilinx serial-conguration PROM.
CCLK speed is selectable as either 1 MHz (default) or 8
MHz. Conguration always starts at the default slow fre-
quency, then can switch to the higher frequency during the
rst frame. Frequency tolerance is -50% to +25%.
Additional Address lines in XC4000 devices
The XC4000X devices have additional address lines
(A18-A21) allowing the additional address space required
to daisy-chain several large devices.
The extra address lines are programmable in XC4000EX
devices. By default these address lines are not activated. In
the default mode, the devices are compatible with existing
XC4000 and XC4000E products. If desired, the extra
address lines can be used by specifying the address lines
option in bitgen as 22 (bitgen -g AddressLines:22). The
lines (A18-A21) are driven when a master device detects,
via the bitstream, that it should be using all 22 address
lines. Because these pins will initially be pulled high by
internal pull-ups, designers using Master Parallel Up mode
should use external pull down resistors on pins A18-A21. If
Master Parallel Down mode is used external resistors are
not necessary.
All 22 address lines are always active in Master Parallel
modes with XC4000XL devices. The additional address
lines behave identically to the lower order address lines. If
the Address Lines option in bitgen is set to 18, it will be
ignored by the XC4000XL device.
The additional address lines (A18-A21) are not available in
the PC84 package.
Peripheral Modes
The two Peripheral modes accept byte-wide data from a
bus. A RDY/BUSY status is available as a handshake sig-
nal. In Asynchronous Peripheral mode, the internal oscilla-
tor generates a CCLK burst signal that serializes the
byte-wide data. CCLK can also drive slave devices. In the
synchronous mode, an externally supplied clock input to
CCLK serializes the data.
Slave Serial Mode
In Slave Serial mode, the FPGA receives serial congura-
tion data on the rising edge of CCLK and, after loading its
conguration, passes additional data out, resynchronized
on the next falling edge of CCLK.
Multiple slave devices with identical congurations can be
wired with parallel DIN inputs. In this way, multiple devices
can be congured simultaneously.
Serial Daisy Chain
Multiple devices with different congurations can be con-
nected together in a “daisy chain,” and a single combined
bitstream used to congure the chain of slave devices.
To congure a daisy chain of devices, wire the CCLK pins
of all devices in parallel, as shown in Figure 51 on page
60. Connect the DOUT of each device to the DIN of the
next. The lead or master FPGA and following slaves each
passes resynchronized conguration data coming from a
single source. The header data, including the length count,
Table 18: Conguration Modes
Mode
M2
M1
M0
CCLK
Data
Master Serial
0
output
Bit-Serial
Slave Serial
1
input
Bit-Serial
Master
Parallel Up
1
0
output
Byte-Wide,
increment
from 00000
Master
Parallel Down
1
0
output
Byte-Wide,
decrement
from 3FFFF
Peripheral
Synchronous*
0
1
input
Byte-Wide
Peripheral
Asynchronous
1
0
1
output
Byte-Wide
Reserved
0
1
0
—
Reserved
0
1
—
* Can be considered byte-wide Slave Parallel
Product Obsolete or Under Obsolescence
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