M-Link Data Layer
M-link data layer operates with words of 4 bytes width.
Data Frame Format
Sync |
Type |
Length |
Seq |
Dst |
Src |
Data |
CRC |
field |
offset |
size |
description |
Sync |
0 |
2 |
Sync word. 0x2A, 0x50 = “*P” |
Type |
2 |
2 |
Frame type |
Length |
4 |
2 |
Frame length in 32-bit words. Valid length is 4 – 511 (data size 0-507) |
Seq |
6 |
2 |
Frame sequence number (counter) |
Dst |
8 |
2 |
Destination Address |
Src |
10 |
2 |
Source Address |
Data |
12 |
0-2028 |
Payload data. 0-507 32-bit words |
CRC |
last |
4 |
CRC32 |
Field offset and size in bytes.
Data flow: for each endpoint, SEND is what endpoint is sending
Data Frame Types
type |
description |
data format |
0x0100 |
Run mode data |
application specific |
0x0101 |
Register R/W request |
|
0x0102 |
Register R/W response |
|
0x0103 |
Status response |
application specific |
0x0105 |
RAM R/W request |
|
0x0106 |
RAM R/W response |
|
0x0107 |
Configuration EEPROM R/W request |
|
0x0108 |
Configuration EEPROM R/W response |
|
0x0110 |
FVME run mode data |
|
0x0111 |
FVME request |
|
0x0112 |
FVME response |
|
0x1001 |
JTAG single op request |
|
0x1002 |
JTAG single op reply |
|
0x1003 |
JTAG shift 32 request |
|
0x1004 |
JTAG shift 32 reply |
|
0x5A5A |
Loopback Test |
any data |
0x5354 |
Stream data |
Reserved Addresses
address |
description |
0xFEFE |
point-to-point |
0xFDFD |
PCIe carrier board |