Complete CCIX Transaction Flow - Complete CCIX Transaction Flow - 5.0 English

Complete CCIX Transaction Flow - Complete CCIX Transaction Flow - 5.0 English - PG118

System Cache LogiCORE IP Product Guide (PG118)

Document ID

PG118

Release Date

2024-12-09

Version

5.0 English

Like ACE Master Port coherency CCIX relies on AxCACHE and the cache state to determine the resulting events in the CCIX domain.

Table 1. Complete Slave ARCACHE to Cache Event and Potential CCIX Transaction Mapping
Slave ARCACHE	Cache Event	Cache Action	CCIX Transaction
00xx	Read Miss	Bypass Cache	ReadNoSnp	ReqAttr=Device-nRnE ReqAttr=Device-nRE ReqAttr=Non-Cached
00xx	Read Hit	Use cached line	N/A	N/A
x100 x110	Read Miss	Bypass cache	ReadOnce	ReqAttr=WBnA
x100 x110	Read Hit	Use cached line	N/A	N/A
0101 0111	Read Miss	Allocate cache line and forward data	ReadShared	ReqAttr=WBA
0101 0111	Read Hit	Use cached line	N/A	N/A
1101 1111	Read Miss	Allocate cache line and forward data	ReadUnique	ReqAttr=WBA
1101 1111	Read Hit	Use cached line	N/A	N/A
10xx	Read Miss	Bypass cache	ReadOnce	ReqAttr=WBnA
10xx	Read Hit	Use cached line	N/A	N/A

Table 2. Complete Slave AWCACHE to Cache Event and Potential CCIX Transaction Mapping
Slave AWCACHE	Cache Event	Cache Action	CCIX Transaction
00xx	Write Miss	Bypass cache	WriteUnique	ReqAttr=WBnA
	Write Hit Shared	Request write permission, evict dirty cache line after write	CleanUnique WriteBack	ReqAttr=WBA
	Write Hit Unique	Evict dirty cache line after write	WriteBack	ReqAttr=WBA
0100 0101 0110	Write Miss	Bypass cache	WriteUnique	ReqAttr=WBnA
	Write Hit Shared	Request write permission, evict dirty cache line after write	CleanUnique WriteBack	ReqAttr=WBnA
	Write Hit Unique	Evict dirty cache line after write	WriteBack	ReqAttr=WBnA
0111	Write Miss	Bypass cache	WriteUnique	ReqAttr=WBA
	Write Hit Shared	Request write permission	CleanUnique	ReqAttr=WBnA
	Write Hit Unique	Update cache line	N/A	N/A
1x00 1x01 1x10	Write Miss	Bypass cache	WriteUnique	ReqAttr=WBA
	Write Hit Shared	Request write permission, evict dirty cache line after write	CleanUnique WriteBack	ReqAttr=WBA
	Write Hit Unique	Evict dirty cache line after write	WriteBack	ReqAttr=WBA
1x11	Write Miss	Allocate cache line	ReadUnique	ReqAttr=WBA
	Write Hit Shared	Request write permission	CleanUnique	ReqAttr=WBA
	Write Hit Unique	Update cache line	N/A	N/A