Entity: MdioLinkIrqHandler
- File: MdioLinkIrqHandler.vhd
Diagram
Description
Title : MDIO Support
Company : SLAC National Accelerator Laboratory
Description: Handle link interrupts signaled by an external PHY and determine updated link status and speed. This modules uses the MdioSeqCore
sequencer core.
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.
This module processes two simple sequences of MDIO commands:
- An initialization sequence upon startup and after reset
- A 'IRQ handler sequence' as a response to a phyIrq. This handler sequence usually contains read transactions which determine the new link status. The first NUM_HDLR_ARGS_G replies to such read transactions are stored and passed back to the user in the 'args' array for further processing by the user.
Generics
| Generic name | Type | Value | Description |
|---|---|---|---|
| TPD_G | time | 1 ns | |
| DIV_G | natural range 1 to natural'high | 1 | half-period of MDC in clk cycles |
| PROG_INIT_G | MdioProgramArray | initialization sequence | |
| PROG_HDLR_G | MdioProgramArray | ||
| NUM_HDLR_ARGS_G | natural | number of readback values the PROG_HDLR_G sequence reads. |
Ports
| Port name | Direction | Type | Description |
|---|---|---|---|
| clk | in | sl | clock and reset |
| rst | in | sl | |
| initDone | out | sl | misc |
| hdlrDone | out | sl | interrupt handled; args array is 'valid' while this is asserted |
| args | out | Slv16Array(0 to NUM_HDLR_ARGS_G - 1) | readback values of the PROG_HDLR_G sequence |
| mdc | out | sl | MDIO interface |
| mdo | out | sl | |
| mdi | in | sl | |
| phyIrq | in | sl | phy interrupt (link status change) |
Signals
| Name | Type | Description |
|---|---|---|
| r | RegType | |
| rin | RegType | |
| mdioRead | sl | |
| mdioDone | sl | |
| mdioData | slv(15 downto 0) |
Constants
| Name | Type | Value | Description |
|---|---|---|---|
| PC_INIT_C | natural | 0 | |
| PC_HDLR_C | natural | PC_INIT_C + PROG_INIT_G'length | |
| REG_INIT_C | RegType | ( state => INIT, nextState => INIT, pc => PC_INIT_C, mdioData => (others => (others => '0')), rbp => 0, trg => '0', initDone => '0', hdlrDone => '0' ) |
|
| MDIO_PROG_C | MdioProgramArray | ( PROG_INIT_G & PROG_HDLR_G ) |
Types
| Name | Type | Description |
|---|---|---|
| StateType | (INIT, START_HDLR, HDLR_DONE, IDLE, WAIT_FOR_MDIO) |
|
| RegType |
Processes
- COMB: ( r, phyIrq, mdioDone, mdioRead, mdioData )
- SEQ: ( clk )
Instantiations
- U_MdioCtrl: surf.MdioSeqCore