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參數(shù)資料
| 型號(hào)： | RSC-412864LQFP |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Speech Recognition Processor |
| 中文描述： | 語音識(shí)別處理器 |
| 文件頁數(shù)： | 16/49頁 |
| 文件大?。?/td> | 690K |
| 代理商： | RSC-412864LQFP |
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RSC-4128
Data Sheet
16
P/N 80-0206-J
2004 Sensory Inc.
Extended Address Register
0D2H R/W
Bit [7:6]
ExtAdd
(Unused)
Bit 5
cb1
0:
MOVC
reads/writes and processor fetches access addresses
00000H-0FFFFH of Constant/Code Space (Code Bank 0)
MOVC
reads/writes and processor fetches access addresses
10000H-1FFFFH of Constant/Code Space (Code Bank 1)
Cleared on reset.
1:
Bit 4
rw
0:
1:
MOVX
reads
access Constant/Code Space
MOVX
reads
access Data Space
Cleared on reset.
Bits [3:0]
“eda” bits – extended address bits [19:16]
used by
MOVX
to generate addresses bits A[19:16] of Data and/or Constant/Code Space.
Cleared on reset.
The programming of the Extended Addressing Register(“extAdd”) is independent of whether the ROM is external or
internal. That is, an external ROM mirrors an internal ROM exactly. This allows products to be developed with
external ROM and masked with the same binary in an internal ROM part.
Note: Unlike the RSC-3x, the last 256 bytes of Data Space are not allocated for internal processor functions. All
internal processor functions are mapped to the SFR area of Register space, leaving all Data space addresses
potentially accessible as external memory.
There are 8 data bus lines. These pins are bi-directional: they are normally inputs except when there is an external
write to Code Space or Data Space. These pins, D[7:0], have weak pull-up devices (~100K ohm) to keep them
from floating when no device is driving the data bus.
External Memory Interface Control Signals
There are 4 active low read/write strobes for reading from and writing to external Constant/Code Space or Data
Space: -RDR, -WRC, -RDF, -WRD. To support cost effective software development for large memory spaces
the external memory strobes are different from earlier RSC chips. The –RDR signal replaces the previous –RDC
signal and the –RDF signal replaces the previous –RDD signal. The –XM pin replaces the previous –XML and
–XMH pins on earlier RSC devices. The –WRC signal and the –WRD signal are the same as in previous RSC
chips. (See “DC Characteristics” section for electrical characteristics.)
The 20-bit extended address for a memory-reference instruction or a code fetch may be directed to the internal
ROM, or it may be directed to an external ROM or flash. The address is
always
an external address if:
1) the instruction is
MOVX
read
and
the “rw” bit is set,
or
2) the instruction is
MOVX
write,
or
3) the –XM pin is low,
or
4) the instruction is a
MOVC
write
Otherwise the address is internal.
The –XM pin is an active low input pin that disables internal ROM when pulled low, and forces the use of external
memory for Constant/Code Space. Write accesses to Constant/Code Space (MOVC write;
–
WRC active) are
always directed off-chip. The -XM pin has a weak pull-up device (~10K ohm) to enable the internal ROM when no
connection is made to this pin. At the end of reset -XM is sampled and, if pulled low externally, the internal 10K
ohm pull-up device is disabled.
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