bff3163012a1837aaf7d4849f8cd29984d3488a1
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 comment
= 'outen' if outenmode
else 'output'
99 fmtstr
= "\t\t\twr%s==%d?%s:%s\n" # mux-selector format
101 ret
+= " // %s muxer for cell idx %s\n" % (comment
, cell
[0])
102 ret
+= " %s%s=\n" % (cn(cell
[0]), suffix
)
104 0, (1 << p
.cell_bitwidth
) - 1): # full mux range (minus 1)
105 comment
= mkcomment(ifaces
, cell
, i
, outenmode
)
106 cf
= fmt(ifaces
, cell
, i
, suffix
)
107 ret
+= fmtstr
% (cn(cell
[0]), i
, cf
, comment
)
108 comment
= mkcomment(ifaces
, cell
, i
+ 1, outenmode
)
109 ret
+= "\t\t\t" + fmt(ifaces
, cell
, i
+ 1, suffix
) # last line
110 ret
+= ";%s\n" % comment
116 """ generates the actual output pinmux for each io-cell. blank lines
117 need to output "0" to the iopad, if there is no entry in
120 text is outputted in the format:
127 last line doesn't need selector-logic, obviously.
129 note that it's *important* that all muxer options be covered
130 (hence going up to 1<<cell_bitwidth) even if the muxer cells
131 are blank (no entries), because muxer selection could be to
132 the last one, and we do not want the "default" (last line)
135 p
.cell_bitwidth
= get_cell_bit_width(p
)
137 global dedicated_wire
138 for cell
in p
.muxed_cells
:
140 # first do the outputs
141 p
.pinmux
+= mkmux(p
, ifaces
, cell
, '_out', False)
144 # now do the output enablers (outens)
145 p
.pinmux
+= mkmux(p
, ifaces
, cell
, '_outen', True)
147 # ======================================================== #
149 # check each cell if "peripheral input/inout" then assign its wire
150 # Here we check the direction of each signal in the dictionary.
151 # We choose to keep the dictionary within the code and not user-input
152 # since the interfaces are always standard and cannot change from
153 # user-to-user. Plus this also reduces human-error as well :)
155 p
.pinmux
+= " // priority-in-muxer for cell idx %s\n" % (cell
[0])
156 for i
in range(0, len(cell
) - 1):
158 if not cname
: # skip blank entries, no need to test
160 temp
= transfn(cname
)
161 x
= ifaces
.getifacetype(temp
)
162 #print (cname, temp, x)
163 assert x
is not None, "ERROR: The signal : " + \
165 " of pinmap.txt isn't present \nin the current" + \
166 " dictionary. Update dictionary or fix-typo."
169 mux_wire
.format(cell
[0], i
, "wr" + cname
) + "\n"
172 mux_wire
.format(cell
[0], i
, "wr" + cname
+
174 # ============================================================ #
176 # ================== Logic for dedicated pins ========= #
177 for cell
in p
.dedicated_cells
:
178 p
.pinmux
+= " %s_out=%s_io;\n" % (cn(cell
[0]), cell
[1])
179 temp
= cell
[1].translate(digits
)
180 x
= ifaces
.getifacetype(temp
)
183 dedicated_wire
.format(cell
[0], "wr" + cell
[1]) + "\n"
186 dedicated_wire
.format(cell
[0], "wr" + cell
[1] + "_in") + "\n"
187 # =======================================================#