SAF82525 Infineon Technologies AG, SAF82525 Datasheet - Page 92

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

Transmit Address Byte 1 (WRITE)
XAD1 (and XAD2) can be programmed with one individual address byte which is appended
automatically to the frame by HSCX in auto-mode. The function depends on the selected
address mode (bit ADM in MODE).
XAD1 forms the high byte of the 2-byte address field. Bit 1 must be set to 0! According to the
ISDN LAPD protocol, bit 1 is interpreted as the C/R (COMMAND/RESPONSE) bit. This is
manipulated automatically by the HSCX dependent on the setting of the CRI bit in RAH1:
Commands transmit
Responses transmit
(In the ISDN, the high address byte is known as SAPI).
In accordance with the HDLC protocol, bit 0 should be set to 0, indicating the extension of the
address field to two bytes.
Semiconductor Group
XAD1 2-byte address
– –
– –
2-byte address field (MODE.ADM = 1)
1-byte address field (MODE.ADM = 0)
According with the X.25 LAPB protocol, XAD1 indicates a COMMAND.
1-byte address
CRI = 1
7
1
0
Bit 1 (C/R)
XAD1 (high byte)
CRI = 0
0
1
XAD1 (COMMAND)
92
0
(0)
0
SAB 82525
SAB 82526
SAF 82525
SAF 82526
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