mirror of https://github.com/efabless/caravel.git
58 lines
2.1 KiB
ReStructuredText
58 lines
2.1 KiB
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<!---
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# SPDX-FileCopyrightText: 2020 Efabless Corporation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# SPDX-License-Identifier: Apache-2.0
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-->
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======================
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Caravel Power control
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======================
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The user project power control register is a "reserved" register that is
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intended for future use with on-chip LDOs to power the user project
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area. In the current version of the Caravel chip, it has no function.
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In the current version of the Caravel chip, all user area power supplies
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are provided by voltage regulators on the demonstration/development
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board.
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**The usable ranges of these power supplies is**:
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user1 vccd (VCCD1) = ``1.8V``
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user2 vccd (VCCD2) = ``1.8V``
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user1 vdda (VDDA1) = ``1.8V`` to ``5.5V`` (nominally ``3.3V``)
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user2 vdda (VDDA2) = ``1.8V`` to ``5.5V`` (nominally ``3.3V``)
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It is the responsibility of the user project area designer to ensure that
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the value of VDDA1 and VDDA2 is compatible with the circuitry connected
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to it in the user project.
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--------------------------------------------------------------------------
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- Register name = ``reg_mprj_pwr``
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- Memory location = ``0x26000004``
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- Housekeeping SPI location = ``0x6e``
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+------+-------+-------+-------+-------+-------+-------+-------+-------+
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| | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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+------+-------+-------+-------+-------+-------+-------+-------+-------+
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| 0x6e | | | | | user1 | user2 | user1 | user2 |
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| | | | | | vccd | vccd | vdda | vdda |
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+------+-------+-------+-------+-------+-------+-------+-------+-------+
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