HW-USB-II-G Xilinx Inc, HW-USB-II-G Datasheet - Page 17

• Manufacturer Part Number: HW-USB-II-G
• Description: PLATFORM CABLE USB II
• Manufacturer: Xilinx Inc

Specifications of HW-USB-II-G

• Accessory Type: USB Platform Cable
• For Use With/related Products: Xilinx FPGA, CPLDS, Platform Flash PROMs, XC18V00 PROMs, System ACE MPM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 122-1572

Direct SPI
Platform Cable USB II can connect directly to a single SPI flash device.
connection. XAPP951, Configuring Xilinx FPGAs with SPI Serial Flash provides additional details of the cable connections
necessary to program a FPGA bitstream into a SPI flash device.
Note:
By connecting PGND to PROG_B of the FPGA
while the cable programs a SPI flash device. PGND is pulled Low when the cable is driving its SPI signals in SPI mode and
set to high-Z when the cable is not driving its SPI signals. PGND eliminates the need for a hardware jumper to ground on the
PROG_B signal and the need for additional control logic. PGND is controlled by an open-drain driver.
Note:
X-Ref Target - Figure 17
Notes:
1.
2.
3.
4.
DS593 (v1.2.1) March 17, 2011
Set Mode pins (M2-M0) on each FPGA to Slave-Serial mode when using the USB cable, so the CCLK is treated as an input.
Example uses generalized nomenclature for the voltages-supply levels. Refer to the device data sheet for the appropriate serial configuration
voltage-supply levels.
Attach the following 2-mm connector pins to digital ground: 3, 5, 7, 9, and 11.
A pull-up is required when two or more devices are cascaded and programmed for open-drain operation.
GND
PROG
DONE
CCLK
See Configuring Xilinx FPGAs with SPI Serial Flash for a list of supported SPI devices.
PGND control for SPI programming is available in iMPACT versions 9.2i and later.
V
INIT
DIN
REF
(3)
10
14
2
8
4
6
*
V
CCAUX (2)
2-mm Connector
V
CCO
(2)
Figure 17: Example of Cascaded Slave-Serial Topology
DIN
PROG
INIT
FPGA
CCLK
DONE
1
(Figure
DOUT
(1)
www.xilinx.com
17), the FPGA can be commanded to set its SPI signals to high-Z
DIN
PROG
INIT
FPGA
Figure 18, page 18
CCLK
DONE
2
DOUT
(1)
shows an example SPI flash
DIN
Platform Cable USB II
PROG
INIT
470Ω
FPGA
V
(4)
CCLK
CCAUX (2)
DONE
DS593_17_021408
n
DOUT
(1)
17