TC1784
LMB External Bus Unit
User´s Manual
12-11
V1.1, 2011-05
EBUT13L-A, V1.16
The “compare” action means that the EBU compares the supplied LMB address to all its
external regions. If a match is found, the EBU performs the appropriate external bus
access. Otherwise, the EBU generates a LMB Error Acknowledge.
The “access registers” action means that the EBU is selected for a control/status register
access. The EBU performs the requested register access (or generates an LMB Error
Acknowledge if there is no register at the supplied address).
For all address ranges that not listed in
the EBU is not selected and LMB
requests are ignored.
12.7.1
External Memory Regions
The EBU of the TC1784 supports four memory regions, which have their own associated
chip select outputs CS[3:0]. Each of these regions has a set of control registers to specify
the type of memory/peripheral device and the access parameters.
Each of the four user-programmable regions (x = 0-3 is the numbering index of these
regions) can be configured to respond to a particular address space through registers
EBU_ADDRSELx,
The access parameters for each of the regions can be programmed individually to
accommodate different types of external devices. Separate control registers are
available to control read and write accesses. This allows optimal access types, speeds
and parameters to be chosen. Access type is configured via BUSRCONx and
BUSWCONx. Access parameters are configured via BUSRAPx and BUWAPx.
Throughout this document the generic term EBU_BUSCONx is used when either of
BUSRCONx or BUSWCONx is applicable and EBU_BUSAPx is used when either of
BUSRAPx or BUSWAPx is applicable.
Table 12-7
EBU External Address Ranges
Address Range
Description
Action
8080 0000
H
- 8FDF FFFF
H
External memory space (cached area)
compare
A080 0000
H
- AFDF FFFF
H
External memory space (non-cached area)
D800 0000
H
- DDFF FFFF
H
External Peripheral Space (non-cached area)
DE00 0000
H
- DEFF FFFF
H
External Emulator Space (non-cached area)
E000 0000
H
- E7FF FFFF
H
External Peripheral Space (non-cached area)
F800 0000
H
- F800 03FF
H
EBU Registers
access
register
Содержание TC1784
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