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參數(shù)資料
| 型號： | AT75C1010 |
| 英文描述： | AT75C1010 Telephony Software Module [Updated 11/01. 29 Pages] This software module runs on the OakDSPCore subsystem of the AT75 series SIAP. expanding its capabilities and making the processor flexible and east to integrate into most operating systems. |
| 中文描述： | AT75C1010電話軟件模塊[更新11/01。 29頁]本軟件模塊上運(yùn)行的AT75系列OakDSPCore子系統(tǒng)統(tǒng)計(jì)所。擴(kuò)大其能力，使處理器的靈活和東部地區(qū)融入大多數(shù)操作系統(tǒng)。 |
| 文件頁數(shù)： | 86/171頁 |
| 文件大?。?/td> | 1288K |
| 代理商： | AT75C1010 |
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21
AT75C DSP Subsystem
1368C–INTAP–08/02
Figure 8. Data Memory Diagram
Memory Addressing
Modes
There are five data memory addressing modes.
Short Direct Addressing Mode Eight bits embedded in the instruction opcode as LSBs plus eight bits from status regis-
ter ST1 as MSB (see “Status Registers” on page 23) compose the 16-bit address to the
data memory. The pages are thus of 256 words each. For example, page 0 corresponds
to addresses 0 to 255 in X-RAM, page 1 from 250 to 511 in X-RAM and page 255 from -
256 to -1 in Y-RAM. Any memory location in the 64K-word data space can be directly
accessed in a single cycle.
Long Direct Addressing Mode
Sixteen bits embedded in the instruction opcode as the second word of the instruction
are used as the 16-bit address of the data memory. Any memory location in the 64K-
word data space can be directly accessed in two cycles.
Indirect Addressing Mode
The Rn registers of the DAAU are used as 16-bit addresses for indirect addressing the
X-RAM and the Y-RAM. Some instructions use two registers, simultaneously address-
ing a memory location in X-RAM and another in Y-RAM, both addressed in indirect
addressing mode.
Short Index Addressing Mode
The base register RB plus an index value (offset7, a 7-bit immediate value embedded in
the instruction opcode) are used for index-based indirect addressing the X-RAM or Y-
RAM. The index value can be from -64 to +63. The actual address is RB + offset7, but
leaving the contents of RB unaffected. For details, refer to “Index Modifier” on page 16.
On-core
Y-RAM
OCEM
CODEC
DPMB
Off-core on-chip
X-RAM
(Data RAM)
On-core
X-RAM
0x0000
0x0800
0x4000
0xE000
0xEC00
0xF000
0xF800
0xFFFF
0x8000
Data
Space
2K
1K
2K
16K
2K
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