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SAB82525N Datasheet(PDF) 96 Page - Siemens Semiconductor Group |
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SAB82525N Datasheet(HTML) 96 Page - Siemens Semiconductor Group |
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96 / 126 page  Semiconductor Group 96 SAB 82525 SAB 82526 SAF 82525 SAF 82526 In operating modes which provide high byte address recognition, the HSCX compares the high byte of a 2-bytes address with the contents of two individual programmable registers (RAH1, RAH2) and the fixed values FEH and FCH (group address). HA1, HA0 … High Byte Address Compare; significant only if 2-byte address mode has been selected. Dependent on the result of this comparison, the following bit combinations are possible: 10 … RAH1 has been recognized 00 … RAH2 has been recognized 01 … group address has been recognized If RAH1, RAH2 contain the identical values, the combination 00 will be omitted. Note: C/R … Command/Response; significant only, if 2-byte address mode has been selected. Value of the C/R bit (bit of high address byte) in the received frame. The interpretation depends on the setting of the CRI bit in the RAH1 register. Refer also to the description of RAH1 register. LA … Low Byte Address Compare; not significant in transparent and extended transparent operating modes. The low byte address of a 2-byte address field, or the single address byte of a 1-byte address field is compared with two programmable registers (RAL1, RAL2) 0 … RAL2 has been recognized 1 … RAL1 has been recognized According to the X.25 LAPB protocol, RAL1 is interpreted as COMMAND and RAL2 interpreted as RESPONSE. RSTA corresponds to the last received HDLC frame; it is duplicated into RFIFO for every frame (last byte of frame). Note: |
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