c5644307e3d5a34c0efae188ff41427b81a81a03
2 from string
import digits
4 from string
import maketrans
6 maketrans
= str.maketrans
9 # ============== common bsv templates ============ #
10 # first argument is the io-cell number being assigned.
11 # second argument is the mux value.
12 # Third argument is the signal from the pinmap file
14 rule assign_{2}_on_cell{0}(wrcell{0}_mux=={1});
19 rule assign_{1}_on_cell{0};
23 # ============================================================
24 digits
= maketrans('0123456789', ' ' * 10) # delete space later
27 def cn(idx
): # idx is an integer
28 return "cell%s_mux" % str(idx
)
32 """ removes the number from the string of signal name.
34 temp
= temp
.split('_')
36 temp
[0] = temp
[0].translate(digits
)
37 temp
[0] = temp
[0] .replace(' ', '')
41 # XXX this needs to move into interface_decl.py
42 # and made to use ifaceoutfmtfn and ifaceinfmtfn
43 def fmt(ifaces
, cells
, idx
, suffix
=None):
44 """ blank entries need to output a 0 to the pin (it could just as
45 well be a 1 but we choose 0). reason: blank entries in
46 the pinmap.txt file indicate that there's nothing to choose
47 from. however the user may still set the muxer to that value,
48 and rather than throw an exception we choose to output... zero.
50 NOTE: IMPORTANT. when a function is an output-only there
51 is a special-case assumption that:
52 * (a) GPIO is always the first mux entry
53 * (b) GPIO's outen is also used to set the pad
54 the reason for this is that it is assumed better that
55 multiple pads be switched simutaneously to outputs
56 by setting the GPIO direction rather than having them
57 set arbitrarily by changing the muxer registers.
67 x
= ifaces
.getifacetype(temp
)
69 return 'val0' # inputs don't get passed through to the out mux
70 if suffix
== '_outen' and x
== 'out':
71 return "wr%s%s" % (cells
[1], suffix
or '') # USE GPIO FOR SELECTION
72 if x
== 'out': # sigh hack, should be using interface_decl
74 return "wr%s%s" % (cell
, suffix
or '')
76 # XXX this needs to move into interface_decl.py
79 def mkcomment(ifaces
, cell
, idx
, outenmode
=False):
80 """ returns a comment string for the cell when muxed
89 x
= ifaces
.getifacetype(temp
)
92 return ' // %s is an input' % cname
93 if outenmode
and x
== 'inout':
94 return ' // bi-directional'
95 if outenmode
and x
== 'out':
96 return ' // %s is an output' % cname
101 def mkmux(p
, ifaces
, cell
, suffix
, outenmode
):
102 """ creates a straight many-to-one muxer that accepts
103 multiple inputs and, based on an "address" routes
104 a given indexed input through to the (one) output
107 comment
= 'outen' if outenmode
else 'output'
108 fmtstr
= "\t\t\twr%s==%d?%s:%s\n" # mux-selector format
110 ret
+= " // %s muxer for cell idx %s\n" % (comment
, cellnum
)
111 ret
+= " %s%s=\n" % (cn(cellnum
), suffix
)
114 0, p
.get_muxwidth(cellnum
) - 1): # full mux range (minus 1)
115 comment
= mkcomment(ifaces
, cell
, i
, outenmode
)
116 cf
= fmt(ifaces
, cell
, i
, suffix
)
117 ret
+= fmtstr
% (cn(cell
[0]), i
, cf
, comment
)
118 comment
= mkcomment(ifaces
, cell
, i
+ 1, outenmode
)
119 ret
+= "\t\t\t" + fmt(ifaces
, cell
, i
+ 1, suffix
) # last line
120 ret
+= ";%s\n" % comment
126 """ generates the actual output pinmux for each io-cell. blank lines
127 need to output "0" to the iopad, if there is no entry in
130 text is outputted in the format:
137 last line doesn't need selector-logic, obviously.
139 note that it's *important* that all muxer options be covered
140 (hence going up to 1<<cell_bitwidth) even if the muxer cells
141 are blank (no entries), because muxer selection could be to
142 the last one, and we do not want the "default" (last line)
146 global dedicated_wire
147 for cell
in p
.muxed_cells
:
149 # first do the outputs
150 p
.pinmux
+= mkmux(p
, ifaces
, cell
, '_out', False)
153 # now do the output enablers (outens)
154 p
.pinmux
+= mkmux(p
, ifaces
, cell
, '_outen', True)
156 # ======================================================== #
158 # check each cell if "peripheral input/inout" then assign its wire
159 # Here we check the direction of each signal in the dictionary.
160 # We choose to keep the dictionary within the code and not user-input
161 # since the interfaces are always standard and cannot change from
162 # user-to-user. Plus this also reduces human-error as well :)
164 p
.pinmux
+= " // priority-in-muxer for cell idx %s\n" % (cell
[0])
165 for i
in range(0, len(cell
) - 1):
167 if not cname
: # skip blank entries, no need to test
169 temp
= transfn(cname
)
170 x
= ifaces
.getifacetype(temp
)
171 print (cname
, temp
, x
)
172 assert x
is not None, "ERROR: The signal : " + \
174 " of pinmap.txt isn't present \nin the current" + \
175 " dictionary. Update dictionary or fix-typo."
178 mux_wire
.format(cell
[0], i
, "wr" + cname
) + "\n"
181 mux_wire
.format(cell
[0], i
, "wr" + cname
+
183 # ============================================================ #
185 # ================== Logic for dedicated pins ========= #
186 p
.pinmux
+= "\n /*=========================================*/\n"
187 p
.pinmux
+= " // dedicated cells\n\n"
188 for cell
in p
.dedicated_cells
:
189 p
.pinmux
+= " // dedicated cell idx %s\n" % (cell
[0])
190 p
.pinmux
+= " %s_out=%s_io;\n" % (cn(cell
[0]), cell
[1])
191 temp
= transfn(cell
[1])
192 x
= ifaces
.getifacetype(temp
)
196 dedicated_wire
.format(cell
[0], "wr" + cell
[1]) + "\n"
199 dedicated_wire
.format(cell
[0], "wr" + cell
[1] + "_in") + "\n"
202 # =======================================================#