M69030 Asiliant Technologies, M69030 Datasheet - Page 63
M69030
Manufacturer Part Number
M69030
Description
Manufacturer
Asiliant Technologies
Datasheet
1.M69030.pdf
(387 pages)
Specifications of M69030
Operating Temperature (min)
0C
Operating Temperature Classification
Commercial
Operating Temperature (max)
70C
Rad Hardened
No
Lead Free Status / Rohs Status
Supplier Unconfirmed
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
M69030
Manufacturer:
CHIPS
Quantity:
20 000
Part Number:
M69030P
Manufacturer:
MIT
Quantity:
20 000
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I/O and Memory Address Maps
5-9
Two-Way Sub-Indexed Register Indices
Using the previously described I/O and memory space shadowing schemes, it is possible to access the 8-
bit registers (IOSS, MSS, FCR, MSR, ST00, ST01, ARxx, CRxx, FRxx, GRxx, MRxx, XRxx, and DAC
registers) in three ways -- i.e., via the I/O register space and via both the pipeline A and pipeline B portions
of the memory-mapped register space. To prevent conflicts between incarnations of driver code, as well as
other software, separate sets of indices, one for pipeline A and the other for pipeline B, are used in
accessing the 8-bit sub-indexed registers (i.e., ARxx, CRxx, FRxx, GRxx, MRxx and XRxx).
With the upper memory map set to the appropriate mode, pipeline A has its own dedicated range of
addresses (offsets 400000 through 7FFFFFh) in the memory-mapped register space, and all accesses
made to the sub-indexed registers through that memory space make use of set A of the sub-indexed register
indices. Likewise, pipeline B also has its own dedicated range of addresses (offsets C00000h to FFFFFFh)
in the memory-mapped register space, and all accesses made to the sub-indexed registers through it make
use of set B of the sub-indexed register indices. This tying of the use of one or the other set of sub-indexed
register indices to the choice of memory space used in making a given access is maintained, regardless of
how the MSS register is set.
Accesses made to the sub-indexed registers via the I/O space can be made to use one or the other of either
set A or set B of the sub-indexed register indices. The IOSS register provides the means of selecting one
or both of these sets of indices to be used as appropriate in such accesses.
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69030 Databook
Revision 1.3 11/24/99
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