Entity: RssiChksum
- File: RssiChksum.vhd
Diagram
Description
Title : RSSI Protocol: https://confluence.slac.stanford.edu/x/1IyfD
Company : SLAC National Accelerator Laboratory
Description: Calculates and checks the RUDP packet checksum. Checksum for IP/UDP/TCP/RUDP.
Works with 64-bit word
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 | |
| DATA_WIDTH_G | positive | 64 | |
| CSUM_WIDTH_G | positive | 16 |
Ports
| Port name | Direction | Type | Description |
|---|---|---|---|
| clk_i | in | sl | |
| rst_i | in | sl | |
| enable_i | in | sl | Enables and initializes the calculations.enable_i <= '1' enables the calculation. the checksum value holds as long as enabled. enable_i <= '0' initializes the calculation. |
| strobe_i | in | sl | Has to indicate valid data and defines the number of calculation clock cycles. |
| length_i | in | positive | Length of checksumed data |
| init_i | in | slv(CSUM_WIDTH_G-1 downto 0) | Initial value of the sumCalculation: init_i = (others=>'0') Validation: init_i = Checksum value |
| data_i | in | slv(DATA_WIDTH_G-1 downto 0) | Fixed to 2 octets (standard specification) |
| chksum_o | out | slv(CSUM_WIDTH_G-1 downto 0) | Direct out 1 c-c delay |
| valid_o | out | sl | Indicates when the module is ready and the checksum is valid |
| check_o | out | sl | Indicates if the calculated checksum is ok (valid upon valid_o='1') |
Signals
| Name | Type | Description |
|---|---|---|
| r | RegType | |
| rin | RegType | |
| s_dataWordSum | slv(CSUM_WIDTH_G+1 downto 0) |
Constants
| Name | Type | Value | Description |
|---|---|---|---|
| RATIO_C | positive | DATA_WIDTH_G/CSUM_WIDTH_G | |
| REG_INIT_C | RegType | ( sum => (others=>'0'), chksum => (others=>'0'), lenCnt => 0, valid => '0' ) |
Types
| Name | Type | Description |
|---|---|---|
| RegType |
Processes
- comb: ( r, rst_i, enable_i, init_i, data_i, strobe_i, length_i, s_dataWordSum )
- seq: ( clk_i )