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SRIO Functional Description
Figure 10. Load/Store Registers for RapidIO (Address Offset: LSU1 0x400-0x418, LSU2 0x420-0x438,
LSU3 0x440-0x458, LSU4 0x460-0x478)
LSU_Reg0
RapidIO Address |
| Control |
31 | 0 | |
LSU_Reg1
RapidIO Address | fset |
| Control |
31 |
| 0 | |
LSU_Reg2
DSP Address |
| Control |
31 | 0 | |
LSU_Reg3
RSV |
| Byte_count |
| Control |
31 | 12 | 11 | 0 |
|
LSU_Reg4
OutPortID | Priority | xambs | ID |
| DestID | RSV |
| Interrupt | ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 8 | 7 | 1 | 0 |
Control
LSU_Reg5
| Drbll |
| Hop | Packet Type |
|
|
|
|
|
|
|
31 | 16 | 15 | 8 | 7 | 0 |
Command
LSU_Reg6
RSV |
| Completion |
| Bsy |
|
|
|
|
|
31 | 5 4 | 1 | 0 | |
Status
Mapping of command register fields to RapidIO packet header fields is as follows:
| Table 13. Control/Command Register Field Mapping |
|
Control/Command Register | RapidIO Packet Header Field |
|
Field |
|
|
RapidIO Address MSB | 32b Ext Address Fields – Packet Types 2,5, and 6 |
|
RapidIO Address | 1. 32b Address– Packet Types 2,5, and 6 (Will be used in conjunction with BYTE_COUNT to |
|
LSB/Config_offset |
| |
create 64b aligned RapidIO packet header address) |
| |
|
| |
| 2. 24b Config_offset Field – Maintenance Packets Type 8 (Will be used in conjunction with |
|
| BYTE_COUNT to create 64b aligned RapidIO packet header Config_offset). The 2 LSB of |
|
| this field must be zero since the smallest configuration access is 4B. |
|
DSP Address | 32b DSP byte address. Not available in RapidIO Header. |
|
Byte_Count | Number of data bytes to Read/Write - up to 4KB. (Used in conjunction with RapidIO address to |
|
| create WRSIZE/RDSIZE and WDPTR in RapidIO packet header.) |
|
| 000000000000b – 4KB |
|
| 000000000001b – 1B |
|
| 000000000010b – 2B |
|
| . . . |
|
| 111111111111b – 4095B |
|
| (Maintenance requests are limited to 4B) |
|
ID Size | RapidIO tt field specifying 8- or |
|
| 00b – 8b deviceIDs |
|
| 01b – 16b deviceIDs |
|
| 10b - reserved |
|
| 11b - reserved |
|
Priority | RapidIO prio field specifying packet priority (0 = lowest, 3 = highest). Request packets should not | |
| be sent at a priority level of 3 to avoid system deadlock. It is the responsibility of the software to |
|
| assign the appropriate outgoing priority. |
|
Xambs | RapidIO xambs field specifying extended address MSB. |
|
DestID | RapidIO destinationID field specifying target device. |
|
SPRU976 | Serial RapidIO (SRIO) | 33 |
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