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| 型號(hào)： | XCV812E-7BG676I |
| 廠商： | Xilinx, Inc. |
| 英文描述： | Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| 中文描述： | 的Virtex娥內(nèi)存擴(kuò)展1.8伏現(xiàn)場(chǎng)可編程門陣列 |
| 文件頁(yè)數(shù)： | 19/116頁(yè) |
| 文件大小： | 1087K |
| 代理商： | XCV812E-7BG676I |
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Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays
DS025-2 (v2.1) July 17, 2002
www.xilinx.com
1-800-255-7778
Module 2 of 4
15
R
At power-up, V
CC
must rise from 1.0 V to V
CC
min in less
than 50 ms, otherwise delay configuration by pulling
PROGRAM Low until V
CC
is valid.
SelectMAP Mode
The SelectMAP mode is the fastest configuration option.
Byte-wide data is written into the FPGA with a BUSY flag
controlling the flow of data.
An external data source provides a byte stream, CCLK, a
Chip Select (CS) signal and a Write signal (WRITE). If
BUSY is asserted (High) by the FPGA, the data must be
held until BUSY goes Low.
Data can also be read using the SelectMAP mode. If
WRITE is not asserted, configuration data is read out of the
FPGA as part of a readback operation.
After configuration, the pins of the SelectMAP port can be
used as additional user I/O. Alternatively, the port can be
retained to permit high-speed 8-bit readback.
Retention of the SelectMAP port is selectable on a
design-by-design basis when the bitstream is generated. If
retention is selected, PROHIBIT constraints are required to
prevent SelectMAP-port pins from being used as user I/O.
Multiple Virtex-E FPGAs can be configured using the
SelectMAP mode, and be made to start-up simultaneously.
To configure multiple devices in this way, wire the individual
CCLK, Data, WRITE, and BUSY pins of all the devices in
parallel. The individual devices are loaded separately by
asserting the CS pin of each device in turn and writing the
appropriate data. See
Table 11
for SelectMAP Write Timing
Characteristics.
Write
Write operations send packets of configuration data into the
FPGA. The sequence of operations for a multi-cycle write
operation is shown below. Note that a configuration packet
can be split into many such sequences. The packet does
not have to complete within one assertion of CS, illustrated
in
Figure 17
.
1.
Assert WRITE and CS Low. Note that when CS is
asserted on successive CCLKs, WRITE must remain
either asserted or de-asserted. Otherwise an abort is
initiated, as described below.
2.
Drive data onto D[7:0]. Note that to avoid contention,
the data source should not be enabled while CS is Low
and WRITE is High. Similarly, while WRITE is High, no
more that one CS should be asserted.
3.
At the rising edge of CCLK: If BUSY is Low, the data is
accepted on this clock. If BUSY is High (from a previous
write), the data is not accepted. Acceptance instead
occurs on the first clock after BUSY goes Low, and the
data must be held until this has happened.
4.
Repeat steps 2 and 3 until all the data has been sent.
5.
De-assert CS and WRITE.
Table 11:
SelectMAP Write Timing Characteristics
Description
Symbol
Values
Units
CCLK
D
0-7
Setup/Hold
1/2
T
SMDCC
/T
SMCCD
5.0 / 1.0
ns, min
CS Setup/Hold
3/4
T
SMCSCC
/T
SMCCCS
7.0 / 1.0
ns, min
WRITE Setup/Hold
5/6
T
SMCCW
/T
SMWCC
7.0 / 1.0
ns, min
BUSY Propagation Delay
7
T
SMCKBY
12.0
ns, max
Maximum Frequency
F
CC
66
MHz, max
Maximum Frequency with no handshake
F
CCNH
50
MHz, max
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XCV812E-7BG900C | Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-7BG900I | Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-7FG404C | Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-7FG404I | Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-7FG556C | Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XCV812E-7BG900C | 制造商:XILINX 制造商全稱:XILINX 功能描述:Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-7BG900I | 制造商:XILINX 制造商全稱:XILINX 功能描述:Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-7FG404C | 制造商:XILINX 制造商全稱:XILINX 功能描述:Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-7FG404I | 制造商:XILINX 制造商全稱:XILINX 功能描述:Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-7FG556C | 制造商:XILINX 制造商全稱:XILINX 功能描述:Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
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