Entity: I2cRegMasterAxiBridge
- File: I2cRegMasterAxiBridge.vhd
Diagram
Description
Company : SLAC National Accelerator Laboratory
Description: Maps a number of I2C devices on an I2C bus onto an AXI Bus.
This file is part of 'SLAC Firmware Standard Library'. It is subject to the license terms in the LICENSE.txt file found in the top-level directory of this distribution and at: https://confluence.slac.stanford.edu/display/ppareg/LICENSE.html. No part of 'SLAC Firmware Standard Library', including this file, may be copied, modified, propagated, or distributed except according to
the terms contained in the LICENSE.txt file.
Generics
| Generic name | Type | Value | Description |
|---|---|---|---|
| TPD_G | time | 1 ns | |
| DEVICE_MAP_G | I2cAxiLiteDevArray | I2C_AXIL_DEV_ARRAY_DEFAULT_C |
Ports
| Port name | Direction | Type | Description |
|---|---|---|---|
| axiClk | in | sl | |
| axiRst | in | sl | |
| axiReadMaster | in | AxiLiteReadMasterType | |
| axiReadSlave | out | AxiLiteReadSlaveType | |
| axiWriteMaster | in | AxiLiteWriteMasterType | |
| axiWriteSlave | out | AxiLiteWriteSlaveType | |
| i2cSelectOut | out | slv(DEVICE_MAP_G'length-1 downto 0) | |
| i2cRegMasterIn | out | I2cRegMasterInType | |
| i2cRegMasterOut | in | I2cRegMasterOutType |
Signals
| Name | Type | Description |
|---|---|---|
| r | RegType | |
| rin | RegType |
Constants
| Name | Type | Value | Description |
|---|---|---|---|
| READ_C | boolean | false | |
| WRITE_C | boolean | true | |
| DEVICE_MAP_LENGTH_C | natural | DEVICE_MAP_G'length | |
| I2C_REG_ADDR_SIZE_C | natural | maxAddrSize(DEVICE_MAP_G) | Number of device register space address bits maped into axi bus is determined by the maximum address size of all the devices. |
| I2C_REG_AXI_ADDR_LOW_C | natural | 2 | |
| I2C_REG_AXI_ADDR_HIGH_C | natural | ite(I2C_REG_ADDR_SIZE_C = 0, 2, I2C_REG_AXI_ADDR_LOW_C + I2C_REG_ADDR_SIZE_C-1) |
|
| I2C_DEV_AXI_ADDR_LOW_C | natural | I2C_REG_AXI_ADDR_HIGH_C + 1 | Number of device address bits mapped into axi bus space is determined by number of devices |
| I2C_DEV_AXI_ADDR_HIGH_C | natural | ite( (DEVICE_MAP_LENGTH_C = 1), I2C_DEV_AXI_ADDR_LOW_C, (I2C_DEV_AXI_ADDR_LOW_C + log2(DEVICE_MAP_LENGTH_C) - 1)) |
|
| REG_INIT_C | RegType | ( axiReadSlave => AXI_LITE_READ_SLAVE_INIT_C, axiWriteSlave => AXI_LITE_WRITE_SLAVE_INIT_C, i2cSelectOut => (others=>'0'), i2cRegMasterIn => I2C_REG_MASTER_IN_INIT_C) |
Types
| Name | Type | Description |
|---|---|---|
| RegType |
Processes
- comb: ( axiReadMaster, axiRst, axiWriteMaster, i2cRegMasterOut, r )
- seq: ( axiClk )
Description
----------------------------------------------------------------------------------------------- Sequential Process -----------------------------------------------------------------------------------------------