TC1784
Program Memory Unit (PMU)
User´s Manual
5-7
V1.1, 2011-05
PMU, V1.47
5.3
Emulation Memory Interface
In the Emulation Device, an Emulation Memory (EMEM) is provided, which can be used
for calibration via program memory or OLDA overlay. Its base address is A/8FF0 0000
H
.
As for Flash and OVRAM accesses, cached (segment 8
H
) and non-cached (segment A
H
)
accesses can be used for EMEM accesses via PMU.
The Emulation Memory interface shown in
is a 64-bit wide memory interface
that controls the CPU-accesses to the Emulation Memory in the Emulation Device. All
widths of write accesses are supported (byte, half-word, word, double-word). CPU-
controlled Load-Modify-Store accesses (with LDMST instruction) are not supported.
In the TC1784 production device, the EMEM interface is always disabled. A CPU read
access from the Emulation Memory region causes a DSE trap and an LMB bus error. If
the Emulation Memory region read access is initiated by a SPB master (e.g. PCP),
additionally a SPB error interrupt is generated. Per default, write accesses to the
Emulation Memory by any master cause an LMB bus error trap in production device.
In the Emulation Device, a LMB bus error trap is reported by the PMU, if the CPU access
can’t be handled by the EMEM, for example, when the CPU accesses a trace memory
tile in EMEM. In this case, the EMEM access is aborted by the PMU.
Similar to the internal 8 KB OVRAM, the EMEM can also be used for overlay blocks
dedicated to blocks in the internal Program Flash or to the virtual OLDA memory,
redirecting (in DMI) Flash/OLDA addresses to the Emulation Memory. Also the external
memory is supported for redirection of blocks into the EMEM.
Содержание TC1784
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