SAB82538 Datasheet, PDF(135/253 Page) Infineon Technologies AG – ICs for Communications

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SAB82538 Datasheet, PDF (135/253 Pages) Infineon Technologies AG – ICs for Communications

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EPTâ¦

RADDâ¦

CRLâ¦

RCRCâ¦

XCRCâ¦

SAB 82538

SAF 82538

HDLC Mode

Enable Preamble Transmission

This bit enables transmission of a preamble. The preamble is started after

Interframe Timefill transmission has been stopped and a new frame is to be

transmitted. The preamble consists of an 8-bit pattern repeated a number

of times. The pattern is defined via register PRE, the number of repetitions

is selected by bits PRE0 and PRE1.

Note: The âShared Flagâ feature is not influenced by preamble

transmission. Zero Bit Insertion is disabled during preamble

transmission.

Receive Address pushed to RFIFO

If this bit is set to â1â, the received HDLC address information (1 or 2 bytes,

depending on the address mode selected via MODE.ADM) is pushed to

RFIFO. This function is applicable in auto mode, non-auto mode and

transparent mode 1.

CRC Reset Level

This bit defines the initialization for the internal receive and transmit CRC

generators:

0â¦ Initialized to (FFFF)FFFFH. Default value for most HDLC/SDLC

applications.

1â¦ Initialized to (0000)0000H.

Receive CRC ON/OFF

Only applicable in non-auto mode and transparent mode 0.

If this bit is set to â1â, the received CRC checksum will be written to RFIFO

(CRC-CCITT: 2 bytes; CRC-32: 4 bytes). The checksum, consisting of the

2 (or 4) last bytes in the received frame, is followed in the RFIFO by the

status information byte (contents of register RSTA). The received CRC

checksum will additionally be checked for correctness. If non-auto mode is

selected, the limits for âValid Frameâ check are modified (refer to

RSTA.VFR).

Transmit CRC ON/OFF

If this bit is set to â1â, the CRC checksum will not be generated internally. It

has to be written as the last two or four bytes in the transmit FIFO (XFIFO).

The transmitted frame will be closed automatically with a closing flag.

Note: The ESCC8 does not check whether the length of the frame, i.e. the

number of bytes to be transmitted makes sense or not.

Semiconductor Group

135

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