Complete ACE Transaction Flow

Complete ACE Transaction Flow - 5.0 English

System Cache LogiCORE IP Product Guide (PG118)

Document ID

PG118

Release Date

2021-11-05

Version

5.0 English

The following tables show the complete transaction flow and conversion from the point the transaction arrives at a Generic or Optimized port where the ARCACHE and AWCACHE values in the tables are the end result of any manipulation by the FORCE or PROHIBIT parameters.

Table 1. Complete Slave ARCACHE to Cache Event and Potential Master Transaction Mapping
Slave ARCACHE	Cache Event	Cache Action	Master ACE Transaction
00xx	Read Miss	Bypass Cache	ReadOnce	ARCACHE = 1111
00xx	Read Hit	Use cached line	N/A	N/A
x100 x110	Read Miss	Bypass cache	ReadOnce	ARCACHE = 1111
x100 x110	Read Hit	Use cached line	N/A	N/A
x101 x111	Read Miss	Allocate cache line and forward data	ReadShared	ARCACHE = 1111
x101 x111	Read Hit	Use cached line	N/A	N/A
10xx	Read Miss	Bypass cache	ReadOnce	ARCACHE = 1111
10xx	Read Hit	Use cached line	N/A	N/A

Table 2. Complete Slave AWCACHE to Cache Event and Potential Master Transaction Mapping
Slave AWCACHE	Cache Event	Cache Action	Master ACE Transaction
00xx	Write Miss	Bypass cache	WriteUnique	AWCACHE = 0011
	Write Hit Shared	Request write permission, evict dirty cache line after write	CleanUnique WriteBack	ARCACHE = 1111 AWCACHE = 0011
	Write Hit Unique	Evict dirty cache line after write	WriteBack	AWCACHE = 0011
0100 0101 0110	Write Miss	Bypass cache	WriteUnique	AWCACHE = 0011
	Write Hit Shared	Request write permission, evict dirty cache line after write	CleanUnique WriteBack	ARCACHE = 1111 AWCACHE = 0011
	Write Hit Unique	Evict dirty cache line after write	WriteBack	AWCACHE = 0011
0111	Write Miss	Bypass cache	WriteUnique	AWCACHE = 0011
	Write Hit Shared	Request write permission	CleanUnique	ARCACHE = 1111
	Write Hit Unique	Update cache line	N/A	N/A
1x00 1x01 1x10	Write Miss	Bypass cache	WriteUnique	AWCACHE = 0011
	Write Hit Shared	Request write permission, evict dirty cache line after write	CleanUnique WriteBack	ARCACHE = 1111 AWCACHE = 0011
	Write Hit Unique	Evict dirty cache line after write	WriteBack	AWCACHE = 0011
1x11	Write Miss	Allocate cache line	ReadUnique	ARCACHE = 1111
	Write Hit Shared	Request write permission	CleanUnique	ARCACHE = 1111
	Write Hit Unique	Update cache line	N/A	N/A