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author | Robert Jordens <jordens@gmail.com> | 2015-07-01 03:18:46 -0600 |
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committer | Spencer Oliver <spen@spen-soft.co.uk> | 2015-08-06 13:14:08 +0100 |
commit | d25355473da9a925a696183a9947aac292cd2f60 (patch) | |
tree | fa695378980ccf9cf0b326a2df4c7dc53709b471 /tcl/cpld/xilinx-xc6s.cfg | |
parent | 3edcb941864d677e30d36ad77c22d86ec7ac8eb3 (diff) |
flash/nor/jtagspi: add JTAGSPI driver
Many FPGA board speak JTAG and have a SPI flash for their bitstream
attached to them. The SPI flash is programmed by first uploading a
proxy bitstream to the FPGA that connects the JTAG interface to the
SPI interface if the IR contains a certain USER instruction. Then the
SPI flash can be erase, written, read directly through the JTAG DR.
The JTAG and SPI signaling is compatible. Such a proxy bitstream only
needs to connect TDO-MISO, TDI-MOSI, TCK-CLK, and the activate the
chip select when the IR contains the special instruction and the JTAG
state machine is in the DR-SHIFT state.
Change-Id: Ibc21d793a83b36fa37e2704966aa5c837c4dd0d2
Signed-off-by: Robert Jordens <jordens@gmail.com>
Reviewed-on: http://openocd.zylin.com/2844
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Diffstat (limited to 'tcl/cpld/xilinx-xc6s.cfg')
0 files changed, 0 insertions, 0 deletions