3 using Staf Verhaegen (Chips4Makers) wishbone TAP
6 from collections
import OrderedDict
7 from nmigen
import (Module
, Signal
, Elaboratable
)
8 from nmigen
.cli
import rtlil
9 from c4m
.nmigen
.jtag
.tap
import IOType
10 from soc
.debug
.dmi
import DMIInterface
, DBGCore
11 from soc
.debug
.dmi2jtag
import DMITAP
13 # map from pinmux to c4m jtag iotypes
14 iotypes
= {'-': IOType
.In
,
19 scanlens
= {IOType
.In
: 1,
25 # sigh this needs to come from pinmux.
28 gpios
.append("gpio%d*" % i
)
29 return {'uart': ['tx+', 'rx-'],
31 'i2c': ['sda*', 'scl+']}
33 # TODO: move to suitable location
35 """declare a list of pins, including name and direction. grouped by fn
36 the pin dictionary needs to be in a reliable order so that the JTAG
37 Boundary Scan is also in a reliable order
39 def __init__(self
, pindict
):
40 self
.io_names
= OrderedDict()
41 if isinstance(pindict
, OrderedDict
):
42 self
.io_names
.update(pindict
)
44 keys
= list(pindict
.keys())
47 self
.io_names
[k
] = pindict
[k
]
50 # start parsing io_names and enumerate them to return pin specs
52 for fn
, pins
in self
.io_names
.items():
54 # decode the pin name and determine the c4m jtag io type
55 name
, pin_type
= pin
[:-1], pin
[-1]
56 iotype
= iotypes
[pin_type
]
57 pin_name
= "%s_%s" % (fn
, name
)
58 yield (fn
, name
, iotype
, pin_name
, scan_idx
)
59 scan_idx
+= scanlens
[iotype
] # inc boundary reg scan offset
62 class JTAG(DMITAP
, Pins
):
63 def __init__(self
, pinset
):
64 DMITAP
.__init
__(self
, ir_width
=4)
65 Pins
.__init
__(self
, pinset
)
67 # enumerate pin specs and create IOConn Records.
68 # we store the boundary scan register offset in the IOConn record
69 self
.ios
= [] # these are enumerated in external_ports
70 for fn
, pin
, iotype
, pin_name
, scan_idx
in list(self
):
71 io
= self
.add_io(iotype
=iotype
, name
=pin_name
)
72 io
._scan
_idx
= scan_idx
# hmm shouldn't really do this
75 # this is redundant. or maybe part of testing, i don't know.
76 self
.sr
= self
.add_shiftreg(ircode
=4, length
=3)
78 # create and connect wishbone
79 self
.wb
= self
.add_wishbone(ircodes
=[5, 6, 7],
80 address_width
=29, data_width
=64,
83 # create DMI2JTAG (goes through to dmi_sim())
84 self
.dmi
= self
.add_dmi(ircodes
=[8, 9, 10])
86 def elaborate(self
, platform
):
87 m
= super().elaborate(platform
)
88 m
.d
.comb
+= self
.sr
.i
.eq(self
.sr
.o
) # loopback as part of test?
91 def external_ports(self
):
92 """create a list of ports that goes into the top level il (or verilog)
94 ports
= super().external_ports() # gets JTAG signal names
95 ports
+= list(self
.wb
.fields
.values()) # wishbone signals
97 ports
+= list(io
.core
.fields
.values()) # io "core" signals
98 ports
+= list(io
.pad
.fields
.values()) # io "pad" signals"
102 if __name__
== '__main__':
103 pinset
= dummy_pinset()
106 vl
= rtlil
.convert(dut
)
107 with
open("test_jtag.il", "w") as f
: