SAF82525 Infineon Technologies AG, SAF82525 Datasheet - Page 17

• Manufacturer Part Number: SAF82525
• Description: Data Communications ICs
• Manufacturer: Infineon Technologies AG

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
– data transfers, which are effectively performed by DMA without CPU interaction using the
Semiconductor Group
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).
HSCX’s DMA interface (DMA mode). Optionally, interrupt controlled data transfer can be
done by the CPU (interrupt mode).
DMA
Controller
Memory
DATA
DRQTA,
DRQTB,
System Bus
DRQRA,
DRQRB,
DACKA
DACKB
17
Serial
Channel
HSCX
B
CPU
Serial
Channel
INT
CS
A
ITS00947
SAB
SAB
SAF
SAF
82525
82526
82525
82526