annotate venus/src/usb/eeprom_93Cx6_16bit.v @ 36:c1256c8757c3

eliminate R209 and tie Iota VLMEM directly to UPR We already eliminated R210 (VLMEM pull-down option) earlier, because our simplified LCD power supply and reset line wiring is incompatible with 1.8V MEMIF. But with VLMEM always needing to be high, a pull-up resistor offers no advantage over a direct tie to UPR, so let's eliminate the superfluous resistor.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 22 Nov 2021 19:19:59 +0000
parents 9f70dc110ad7
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
23
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 module eeprom_93Cx6_16bit (GND, VCC, CS, SK, DIN, DOUT);
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 input GND, VCC;
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 input CS, SK, DIN;
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 output DOUT;
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 /* instantiate the package; the mapping of signals to pins is defined here */
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 pkg_IC_8pin pkg (.pin_1(CS),
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 .pin_2(SK),
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 .pin_3(DIN),
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 .pin_4(DOUT),
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 .pin_5(GND),
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 .pin_6(VCC), /* ORG input on some 93Cx6 variants */
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 .pin_7(), /* no connect */
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 .pin_8(VCC)
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 );
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18
9f70dc110ad7 venus/src/usb: building blocks from DUART28
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 endmodule