PLX Technology PEX 8311RDK, Справочник по аппаратуре

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PEX 8311RDK Hardware Reference Manual, Version 0.90
26 © 2005 PLX Technology, Inc. All rights reserved.
Table 4-6 shows the resistor options and jumpers used to connect the 14 pin Target Interface connector
(e.g. Molex part no. 87831-1420) JP7 to an Xilinx Spartan-3E array. JP7 can be used with appropriate
programmers from Xilinx to configure the device using the JTAG interface.
Table 4-6 also assumes that JP7 is connected directly to the Xilinx FPGA. It is also possible to create a
scan chain with the configuration PROM (FP1) if used. This is detailed further in section 4.4.2.3.3.
Depending upon the device, care should be taken with HSWAP_EN (pin 143). This pin configures the
internal pull-up resistors. By default pin 143 will be connected to LBE3# (via R569) and is pulled high
using RN2. This will disable the internal pull-ups. If the internal pull-ups are required this pin needs to be
pulled low using R571 and R597.
Table 4-6. Xilinx Uncommitted FPGA JTAG interconnections
FPGA JTAG
program option
Connector
[pin]
JTAG
signal
Link Resistor
(value)
FPGA signal [pin]
Pull-up resistor
or jumper
Pull-down
resistor or
jumper
JP7 [2] Vref (2.5V) - - - -
JP7 [4] F_TMS R172 (100 Ω )
1
TMS[108] - -
JP7 [6] F_TCK R170 (100 Ω )
1
TCK [110] - -
JP7 [8] F_TDO R171 (0)
1
TDO [109] - -
JP7 [10] F_TDI R173 (100 Ω )
1
TDI [144] - -
JP7 [12,14] NC - - - -
JP7
[1,3,5,7,9,
11,13]
GND - - - -
- -
R180 (0 or 56
Ω )
1,2
PROG_B [1]
JP5 [1-2] or
JP5 NC
-
- - R348 (0) DONE [72] R358 (330 Ω )
3
-
- - R292 (0) INIT_B [40]
JP4 [1-2] or
JP4 NC + R116
(4K7)
4
R250 (0)
- - R309 (0) M0 [62] R368 (10K) -
- - R297 (0) M1 [60] - R361 (10K)
Xilinx Spartan-3E
array using 14 pin
Target Interface
Connector
- - R284 (0) M2 [57]
5
- R367 (10k)
Notes:
1) The value of the series current limiting resistor may vary depending on the programmer
and the programming voltage used. If using 3.3V programming then 56
Ω
is typically used.
Refer to the appropriate Xilinx application notes for further information.
2) PROG_B is connected to GPIO3. GPIO3 is an input by default.
3) The resistor options shown pull DONE to 3.3V. Depending on the programming option
selected DONE can be pulled to 2.5V using R358.
4) INIT_B is connected to GPIO2. GPIO2 is an input by default.
5) If this pin is connected to LA19 through R283 then R284 and R367 are not required as
this pin is pulled high using RN11.
In addition to the above resistors the appropriate power supply and ground resistors must also be
populated.