TC1784
On-Chip System Buses and Bus Bridges
User´s Manual
4-16
V1.1, 2011-05
Buses, V1.9
4.4
Local Memory Bus to FPI Bus Interface (LFI Bridge)
This section describes the basic functionality of the LFI Bridge.
4.4.1
Functional Overview
The LFI Bridge is a bi-directional bus bridge between the LMB and the System
Peripheral FPI Bus (SPB). The bridge supports all transactions types of both the LMB
Bus and FPI Bus.
The bridge is not direction-transparent, this means that the master TAG of a bus master
is not forwarded to the other side of the bridge and is replaced instead by the master TAG
of the LFI Bridge itself.
In order to avoid deadlocks, priority is given to transactions initiated by the DMA or the
PCP.
The bridge supports the pipelining of both connected buses. Therefore, no additional
delay is created except for bus protocol conversions.
Address Translation
Addresses of SPB transfers (initiated by the DMA or the PCP) via the LFI Bridge that
address an LMB slave device, are translated into an LMB address according to
Bus Errors at Writes via the LFI Bridge
When a write operation has been initiated and directed to the LFI Bridge by an SPB bus
master, the LFI Bridge handles the write transaction at the LMB autonomously. If the
write operation at the LMB results in a bus error, the LBCU detects the bus error and
generates an LMB bus error interrupt. There is no bus error generated at the SPB side
in this case because of the posted nature of a write operation.
The equivalent behavior occurs when an LMB master initiates a write to an SPB slave
device. In this case, SPB bus errors are detected by the SBCU but not at the LMB side.
Table 4-6
SPB to LMB Bus Address Translation
Transaction
Destination
SPB Access Range
Translated LMB Address
Reserved
E800 0000
H
- E83F FFFF
H
C800 0000
H
- C83F FFFF
H
DMI LDRAM
E840 0000
H
- E841 FFFF
H
D000 0000
H
- D001 FFFF
H
Reserved
E842 0000
H
- E84F FFFF
H
D002 0000
H
- D00F FFFF
H
PMI SPRAM
E850 0000
H
- E850 9FFF
H
C000 0000
H
- C000 9FFF
H
Reserved
E850 A000
H
- E85F FFFF
H
C000 A000
H
- C000 FFFF
H
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