| // SPDX-FileCopyrightText: 2020 Efabless Corporation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // SPDX-License-Identifier: Apache-2.0 |
| |
| `default_nettype none |
| |
| // This module represents an unprogrammed set of GPIO pad default |
| // values that is configured with via programming on the chip top |
| // level. This value is passed as a set of parameters (formerly |
| // part of gpio_control_block.v). |
| |
| module gpio_defaults_block #( |
| // Parameterized initial startup state of the pad. The default |
| // parameters if unspecified is for the pad to be a user input |
| // with no pull-up or pull-down, so that it is disconnected |
| // from the outside world. See defs.h for configuration word |
| // definitions. |
| parameter GPIO_CONFIG_INIT = 13'h0402 |
| ) ( |
| `ifdef USE_POWER_PINS |
| inout VPWR, |
| inout VGND, |
| `endif |
| output [12:0] gpio_defaults |
| ); |
| wire [12:0] gpio_defaults; |
| wire [12:0] gpio_defaults_high; |
| wire [12:0] gpio_defaults_low; |
| |
| // For the mask revision input, use an array of digital constant logic cells |
| |
| sky130_fd_sc_hd__conb_1 gpio_default_value [12:0] ( |
| `ifdef USE_POWER_PINS |
| .VPWR(VPWR), |
| .VPB(VPWR), |
| .VNB(VGND), |
| .VGND(VGND), |
| `endif |
| .HI(gpio_defaults_high), |
| .LO(gpio_defaults_low) |
| ); |
| |
| genvar i; |
| generate |
| for (i = 0; i < 13; i = i+1) begin |
| assign gpio_defaults[i] = (GPIO_CONFIG_INIT & (13'h0001 << i)) ? |
| gpio_defaults_high[i] : gpio_defaults_low[i]; |
| end |
| endgenerate |
| |
| endmodule |
| `default_nettype wire |