d35757b65bd62a5c52fc77ecd771ef7d8ca0f788
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 get_cell_bit_width(p
):
29 for cell
in p
.muxed_cells
:
30 max_num_cells
= max(len(cell
) - 1, max_num_cells
)
31 return int(math
.log(max_num_cells
+ 1, 2))
34 def cn(idx
): # idx is an integer
35 return "cell%s_mux" % str(idx
)
39 """ removes the number from the string of signal name.
41 temp
= temp
.split('_')
43 temp
[0] = temp
[0].translate(digits
)
44 temp
[0] = temp
[0] .replace(' ', '')
48 # XXX this needs to move into interface_decl.py
49 # and made to use ifaceoutfmtfn and ifaceinfmtfn
50 def fmt(ifaces
, cell
, idx
, suffix
=None):
51 """ blank entries need to output a 0 to the pin (it could just as
52 well be a 1 but we choose 0). reason: blank entries in
53 the pinmap.txt file indicate that there's nothing to choose
54 from. however the user may still set the muxer to that value,
55 and rather than throw an exception we choose to output... zero.
65 x
= ifaces
.getifacetype(temp
)
67 return '0' # inputs don't get passed through to the out mux
68 if suffix
== '_outen' and x
== 'out':
70 return "wr%s%s" % (cell
, suffix
or '')
72 # XXX this needs to move into interface_decl.py
75 def mkcomment(ifaces
, cell
, idx
, outenmode
=False):
76 """ returns a comment string for the cell when muxed
85 x
= ifaces
.getifacetype(temp
)
88 return ' // %s is an input' % cname
89 if outenmode
and x
== 'inout':
90 return ' // bi-directional'
91 if outenmode
and x
== 'out':
92 return ' // %s is an output' % cname
97 def mkmux(p
, ifaces
, cell
, suffix
, outenmode
):
98 """ creates a straight many-to-one muxer that accepts
99 multiple inputs and, based on an "address" routes
100 a given indexed input through to the (one) output
102 comment
= 'outen' if outenmode
else 'output'
103 fmtstr
= "\t\t\twr%s==%d?%s:%s\n" # mux-selector format
105 ret
+= " // %s muxer for cell idx %s\n" % (comment
, cell
[0])
106 ret
+= " %s%s=\n" % (cn(cell
[0]), suffix
)
108 0, (1 << p
.cell_bitwidth
) - 1): # full mux range (minus 1)
109 comment
= mkcomment(ifaces
, cell
, i
, outenmode
)
110 cf
= fmt(ifaces
, cell
, i
, suffix
)
111 ret
+= fmtstr
% (cn(cell
[0]), i
, cf
, comment
)
112 comment
= mkcomment(ifaces
, cell
, i
+ 1, outenmode
)
113 ret
+= "\t\t\t" + fmt(ifaces
, cell
, i
+ 1, suffix
) # last line
114 ret
+= ";%s\n" % comment
120 """ generates the actual output pinmux for each io-cell. blank lines
121 need to output "0" to the iopad, if there is no entry in
124 text is outputted in the format:
131 last line doesn't need selector-logic, obviously.
133 note that it's *important* that all muxer options be covered
134 (hence going up to 1<<cell_bitwidth) even if the muxer cells
135 are blank (no entries), because muxer selection could be to
136 the last one, and we do not want the "default" (last line)
139 p
.cell_bitwidth
= get_cell_bit_width(p
)
141 global dedicated_wire
142 for cell
in p
.muxed_cells
:
144 # first do the outputs
145 p
.pinmux
+= mkmux(p
, ifaces
, cell
, '_out', False)
148 # now do the output enablers (outens)
149 p
.pinmux
+= mkmux(p
, ifaces
, cell
, '_outen', True)
151 # ======================================================== #
153 # check each cell if "peripheral input/inout" then assign its wire
154 # Here we check the direction of each signal in the dictionary.
155 # We choose to keep the dictionary within the code and not user-input
156 # since the interfaces are always standard and cannot change from
157 # user-to-user. Plus this also reduces human-error as well :)
159 p
.pinmux
+= " // priority-in-muxer for cell idx %s\n" % (cell
[0])
160 for i
in range(0, len(cell
) - 1):
162 if not cname
: # skip blank entries, no need to test
164 temp
= transfn(cname
)
165 x
= ifaces
.getifacetype(temp
)
166 #print (cname, temp, x)
167 assert x
is not None, "ERROR: The signal : " + \
169 " of pinmap.txt isn't present \nin the current" + \
170 " dictionary. Update dictionary or fix-typo."
173 mux_wire
.format(cell
[0], i
, "wr" + cname
) + "\n"
176 mux_wire
.format(cell
[0], i
, "wr" + cname
+
178 # ============================================================ #
180 # ================== Logic for dedicated pins ========= #
181 p
.pinmux
+= "\n /*=========================================*/\n"
182 p
.pinmux
+= " // dedicated cells\n\n"
183 for cell
in p
.dedicated_cells
:
184 p
.pinmux
+= " // dedicated cell idx %s\n" % (cell
[0])
185 p
.pinmux
+= " %s_out=%s_io;\n" % (cn(cell
[0]), cell
[1])
186 temp
= transfn(cell
[1])
187 x
= ifaces
.getifacetype(temp
)
191 dedicated_wire
.format(cell
[0], "wr" + cell
[1]) + "\n"
194 dedicated_wire
.format(cell
[0], "wr" + cell
[1] + "_in") + "\n"
197 # =======================================================#