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
, cells
, 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.
57 NOTE: IMPORTANT. when a function is an output-only there
58 is a special-case assumption that:
59 * (a) GPIO is always the first mux entry
60 * (b) GPIO's outen is also used to set the pad
61 the reason for this is that it is assumed better that
62 multiple pads be switched simutaneously to outputs
63 by setting the GPIO direction rather than having them
64 set arbitrarily by changing the muxer registers.
74 x
= ifaces
.getifacetype(temp
)
76 return 'val0' # inputs don't get passed through to the out mux
77 if suffix
== '_outen' and x
== 'out':
78 return "wr%s%s" % (cells
[1], suffix
or '') # USE GPIO FOR SELECTION
79 if x
== 'out': # sigh hack, should be using interface_decl
81 return "wr%s%s" % (cell
, suffix
or '')
83 # XXX this needs to move into interface_decl.py
86 def mkcomment(ifaces
, cell
, idx
, outenmode
=False):
87 """ returns a comment string for the cell when muxed
96 x
= ifaces
.getifacetype(temp
)
99 return ' // %s is an input' % cname
100 if outenmode
and x
== 'inout':
101 return ' // bi-directional'
102 if outenmode
and x
== 'out':
103 return ' // %s is an output' % cname
108 def mkmux(p
, ifaces
, cell
, suffix
, outenmode
):
109 """ creates a straight many-to-one muxer that accepts
110 multiple inputs and, based on an "address" routes
111 a given indexed input through to the (one) output
113 comment
= 'outen' if outenmode
else 'output'
114 fmtstr
= "\t\t\twr%s==%d?%s:%s\n" # mux-selector format
116 ret
+= " // %s muxer for cell idx %s\n" % (comment
, cell
[0])
117 ret
+= " %s%s=\n" % (cn(cell
[0]), suffix
)
119 0, (1 << p
.cell_bitwidth
) - 1): # full mux range (minus 1)
120 comment
= mkcomment(ifaces
, cell
, i
, outenmode
)
121 cf
= fmt(ifaces
, cell
, i
, suffix
)
122 ret
+= fmtstr
% (cn(cell
[0]), i
, cf
, comment
)
123 comment
= mkcomment(ifaces
, cell
, i
+ 1, outenmode
)
124 ret
+= "\t\t\t" + fmt(ifaces
, cell
, i
+ 1, suffix
) # last line
125 ret
+= ";%s\n" % comment
131 """ generates the actual output pinmux for each io-cell. blank lines
132 need to output "0" to the iopad, if there is no entry in
135 text is outputted in the format:
142 last line doesn't need selector-logic, obviously.
144 note that it's *important* that all muxer options be covered
145 (hence going up to 1<<cell_bitwidth) even if the muxer cells
146 are blank (no entries), because muxer selection could be to
147 the last one, and we do not want the "default" (last line)
150 p
.cell_bitwidth
= get_cell_bit_width(p
)
152 global dedicated_wire
153 for cell
in p
.muxed_cells
:
155 # first do the outputs
156 p
.pinmux
+= mkmux(p
, ifaces
, cell
, '_out', False)
159 # now do the output enablers (outens)
160 p
.pinmux
+= mkmux(p
, ifaces
, cell
, '_outen', True)
162 # ======================================================== #
164 # check each cell if "peripheral input/inout" then assign its wire
165 # Here we check the direction of each signal in the dictionary.
166 # We choose to keep the dictionary within the code and not user-input
167 # since the interfaces are always standard and cannot change from
168 # user-to-user. Plus this also reduces human-error as well :)
170 p
.pinmux
+= " // priority-in-muxer for cell idx %s\n" % (cell
[0])
171 for i
in range(0, len(cell
) - 1):
173 if not cname
: # skip blank entries, no need to test
175 temp
= transfn(cname
)
176 x
= ifaces
.getifacetype(temp
)
177 #print (cname, temp, x)
178 assert x
is not None, "ERROR: The signal : " + \
180 " of pinmap.txt isn't present \nin the current" + \
181 " dictionary. Update dictionary or fix-typo."
184 mux_wire
.format(cell
[0], i
, "wr" + cname
) + "\n"
187 mux_wire
.format(cell
[0], i
, "wr" + cname
+
189 # ============================================================ #
191 # ================== Logic for dedicated pins ========= #
192 p
.pinmux
+= "\n /*=========================================*/\n"
193 p
.pinmux
+= " // dedicated cells\n\n"
194 for cell
in p
.dedicated_cells
:
195 p
.pinmux
+= " // dedicated cell idx %s\n" % (cell
[0])
196 p
.pinmux
+= " %s_out=%s_io;\n" % (cn(cell
[0]), cell
[1])
197 temp
= transfn(cell
[1])
198 x
= ifaces
.getifacetype(temp
)
202 dedicated_wire
.format(cell
[0], "wr" + cell
[1]) + "\n"
205 dedicated_wire
.format(cell
[0], "wr" + cell
[1] + "_in") + "\n"
208 # =======================================================#