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2.13. Comparison between bridges and their low-latency versions

The following table compares the intended uses of the AHB5 to AHB5 sync-down bridge, the AHB5 to AHB5 sync-up bridge and the AHB to APB4 sync-down bridge, and their low-latency equivalents.

Table 2.25. 
BridgePower managentDescriptionUses
AHB5 to AHB5 sync-down bridgeQ-channel

Bridge that synchronizes crossing between fast AHB5 domain and slow AHB5 domain.

Supports power domain crossing using Q-channels.

Boundary between fast AHB5 power domain and slow AHB5 power domain.

AHB5 to AHB5 low-latency sync-down bridgeN/A

Bridge that synchronizes crossing between fast AHB5 domain and slow AHB5 domain.

Latency optimized with no support for Q-channels or power domain crossing.

Boundary between fast AHB5 power domain and slow AHB5 power domain.

Designs that do not use Q-channel for power management.

Latency critical paths inside one power domain.

AHB5 to AHB5 sync-up bridgeQ-channel

Bridge that synchronizes crossing between slow AHB5 power domain and fast AHB5 power domain.

Supports power domain crossing using Q-channels.

Boundary between slow AHB5 domain and fast AHB5 domain.

AHB5 to AHB5 low-latency sync-up bridgeN/A

Bridge that synchronizes crossing between slow AHB5 domain and fast AHB5 domain.

Latency optimized with no support for Q-channels or power domain crossing.

Boundary between slow AHB5 domain and fast AHB5 domain.

Designs that do not use Q-channel for power management.

Latency critical paths inside one power domain.

AHB5 to APB4 sync-down bridgeQ-channel

Bridge between AHB5 domain and APB4 domain.

Uses handshaking between fast clock and slow clock to enable clean power domain crossing.

Connection between APB4 peripheral device and AHB5 bus.

AHB5 to APB4 low-latency sync-down bridgeN/A

Bridge between AHB5 domain and APB4 domain.

Latency optimized by using clock enable signal.

Connection between APB4 peripheral device and AHB5 bus.

Designs that do not use Q-channel for power management.

Latency critical paths inside one power domain.


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