Visible to Intel only — GUID: hfy1659542941636
Ixiasoft
Visible to Intel only — GUID: hfy1659542941636
Ixiasoft
5. CSR Map and Descriptor Queue
The CSR interface uses a 32-bit data path in which all accesses are aligned to 32 bits; however the address is a byte address. The size of the CSR address space is 2048 bytes (11 bit addressable). The regions within the CSR address space are listed in the table that follows.
Base Address |
Feature |
---|---|
0x000 |
Discovery ROM (512 word) |
0x200 |
|
0x210 |
|
0x220 |
|
0x240 |
|
0x250 |
|
0x260 | DMA License Register |
0x264 | DMA Transaction Counters |
Register and Bit Attribute Definitions
The following notation describes the CSR registers.
Attribute |
Expansion |
Description |
---|---|---|
RW |
Read/Write |
This bit can be read or written by software. |
RO |
Read Only |
The bit is set by hardware only. Software can only read this bit. Writes have no effect. |
RW1C |
Read/Write 1to Clear |
Software can read or clear this bit. Software must write 1 to clear this bit. Writing zero to an RW1C bit has no effect. A multibit RW1C field can exist. In that case, all bits in the field are cleared if a 1 is written to any of the bits. |
RsvdZ |
Reserved and zero |
Reserved for future RW1C implementations. When you write to a register with RsvdZ bits, only write zeros to these bits. |