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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]本軟件模塊上運行的AT75系列OakDSPCore子系統(tǒng)統(tǒng)計所。擴大其能力，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)： | 57/171頁 |
| 文件大?。?/td> | 1288K |
| 代理商： | AT75C1010 |
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15
AT75C DSP Subsystem
1368C–INTAP–08/02
Configuration Registers
CFGI
CFGJ
Linear (Step) Modifier
During one instruction cycle, one or two (from different groups) of the address register,
Rn, can be post-incremented or post-decremented by 1 or added with a 2’s complement
7-bit step (from -64 to +63). The selection of linear modifier type (one out of four) is
included in the relevant instructions (see “Conventions” on page 34). Step values STEPI
and STEPJ are stored as the seven LSBs of the configuration registers, CFGI and
CFGJ, respectively.
Modulo Modifier
The two modulo arithmetic units can update one or two address registers from different
groups within one instruction cycle. They are capable of performing modulo calculations
of up to 2
9. Each register can be set independently to be affected or unaffected by the
modulo calculation using the six Mn status bits in the ST2 register. Modulo setting val-
ues MODI and MODJ are stored in nine MSBs of configuration registers CFGI and
CFGJ, respectively.
For proper modulo calculation, the following constraints must be satisfied (M = modulo
factor; q = STEPx, +1 or -1).
1.
Rn should be initiated with a number whose p LSBs are less than M, where p is
the minimal integer that satisfies 2
p
≤ M.
2.
The constraints when the modulo M to the power of 2 (full modulo operation):
a. The lower boundary (base address) must have zeros in at least the k LSBs,
where k is the minimal integer that satisfies 2
k
≥ M-1.
b. MODx (x denotes I or J) must be loaded with M - |q|.
c. M
≥ q
3.
The constraints when the modulo M is not a power of 2:
a. The lower boundary (base address) must have zeros in at least the k LSBs,
where k is the minimal integer that satisfies 2
k
≥ M - |q|.
b. MODx (x denotes I or J) must be loaded with M - |q|.
c. M must be an integer multiple of q (this is always true for q = ±1).
d. Rn should be initiated with a number that contains an integer multiple of |q| or
zeros in its k LSBs.
Note:
|q| denotes the absolute value of q.
The modulo modifier operation, a post-modification of the Rn register, is defined as
follows:
Rn <- 0 in k LSB; if Rn is equal to MODx in k LSB and q
≥ 0,
15
14
13
12
11
10
9
8
MODI
76
54
32
10
STEPI
15
14
13
12
11
10
9
8
MODJ
76
54
32
10
STEPJ
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