# xilinx spartan6
# http://www.xilinx.com/support/documentation/user_guides/ug380.pdf

if { [info exists CHIPNAME] } {
	set _CHIPNAME $CHIPNAME
} else {
	set _CHIPNAME xc6s
}

# the 4 top bits (28:31) are the die stepping. ignore it.
jtag newtap $_CHIPNAME tap -irlen 6 -ignore-version \
	-expected-id 0x04000093 \
	-expected-id 0x04001093 \
	-expected-id 0x04002093 \
	-expected-id 0x04004093 \
	-expected-id 0x04024093 \
	-expected-id 0x04008093 \
	-expected-id 0x04028093 \
	-expected-id 0x0400E093 \
	-expected-id 0x0402E093 \
	-expected-id 0x04011093 \
	-expected-id 0x04031093 \
	-expected-id 0x0401D093 \
	-expected-id 0x0403D093

pld device virtex2 $_CHIPNAME.tap

set XC6S_CFG_IN 0x05
set XC6S_JSHUTDOWN 0x0d
set XC6S_JPROGRAM 0x0b
set XC6S_JSTART 0x0c
set XC6S_BYPASS 0x3f

proc xc6s_program {tap} {
	global XC6S_JSHUTDOWN XC6S_JPROGRAM XC6S_JSTART XC6S_BYPASS
	irscan $tap $XC6S_JSHUTDOWN
	irscan $tap $XC6S_JPROGRAM
	irscan $tap $XC6S_JSTART
	irscan $tap $XC6S_BYPASS
}

#xtp038 and xc3sprog approach
proc xc6s_program_iprog {tap} {
	global XC6S_JSHUTDOWN XC6S_JSTART XC6S_BYPASS XC6S_CFG_IN
	irscan $tap $XC6S_JSHUTDOWN
	runtest 16
	irscan $tap $XC6S_CFG_IN
	# xtp038 IPROG 16bit flipped
	drscan $tap 16 0xffff 16 0x9955 16 0x66aa 16 0x850c 16 0x7000 16 0x0004
	irscan $tap $XC6S_JSTART
	runtest 32
	irscan $tap $XC6S_BYPASS
	runtest 1
}