參數(shù)資料
型號: SAB82525H
廠商: INFINEON TECHNOLOGIES AG
英文描述: Data Communications ICs
中文描述: 數(shù)據(jù)通信集成電路
文件頁數(shù): 17/126頁
文件大?。?/td> 730K
代理商: SAB82525H
Semiconductor Group
17
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SAF
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1.2 System Integration
General Aspects
Figure 2
gives a general overview of the system integration of HSCX.
Figure 2
General System Integration of HSCX
The HSCX bus interface consists of an 8-bit bidirectional data bus (D0–D7), seven address
line inputs (A0–A6), three control inputs (RD/DS, WR/R/W, CS), one interrupt request output
(INT) and a 4-channel DMA interface (DRQTA, DRQRA, DACKA, DRQTB, DRQRB, DACKB).
Mode input pins (strapping options) allow the bus interface to be configured for either Siemens/
Intel or Motorola environment.
Generally, there are two types of transfers occurring via the system bus:
– command/status transfers, which are always controlled by the CPU. The CPU sets the
operation mode (initialization), controls function sequences and gets status information by
writing or reading the HSCX’s registers (via CS, WR or RD, and register address via A0-A6).
– data transfers, which are effectively performed by DMA without CPU interaction using the
HSCX’s DMA interface (DMA mode). Optionally, interrupt controlled data transfer can be
done by the CPU (interrupt mode).
Memory
CPU
CS
System Bus
HSCX
DATA
DRQTA,
DRQTB,
DMA
Controller
C
S
Serial
Channel
INT
ITS00947
A
B
Channel
Serial
DRQRA,
DRQRB,
DACKA
DACKB
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