SAB82525H-V21 datasheet(77/126 Pages) SIEMENS

Part #	SAB82525H-V21

Description	High-Level Serial Communication Controller Extended

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Manufacturer	SIEMENS [Siemens Semiconductor Group]

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Semiconductor Group

77

SAB 82525

SAB 82526

SAF 82525

SAF 82526

The following figure gives an example of an interrupt controlled reception sequence, supposed

that a long frame (66 bytes) followed by two short frames (6 bytes each) are received.

Figure 37

Interrupt Driven Reception Sequence Example

Serial

Interface

HSCX

CPU

Interface

ITD00251

RPF

RMC

RD

32

RD

RMC

RPF

RME

RMC

RME

RMC

32

2

6

Receive Frame

Bytes)

Bytes

. . .

...

1 (66

DMA Mode

If the RFIFO contains 32 bytes, the HSCX autonomously requests a block data transfer by

DMA activating the DRQR line as long as the start of the 32nd read cycle. This forces the DMA

controller to continuously perform bus cycles till 32 bytes are transferred from the HSCX to the

system memory.

If the RFIFO contains less than 32 bytes (one short frame or the last part of a long frame) the

HSCX requests a block data transfer depending on the contents of the RFIFO according to the

following table:

RFIFO

Contents

(Bytes)

DMA

Request

(Bytes)

1, 2, 3

4 - 7

8 - 15

16 - 32

4

8

16

32

Note: All available status informations after RME are summarized in table 10.

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