HFC-SUSB Cologne Chip AG, HFC-SUSB Datasheet - Page 28

• Manufacturer Part Number: HFC-SUSB
• Description: Isdn S/t HDLC Basic Rate Controller
• Manufacturer: Cologne Chip AG

863 C EC2
3.3
The HFC-S USB has an integrated 8 bit auxiliary port with multiplexed address/data bus which can be
used as USB bridge in mode 1 (see also Mode description on page 8). A microprocessor is not required
to use this USB bridge. The host can easily write an address (P_ADR_W register) to the auxiliary port
and then read/write data (P_DATA register) from/to this address. The device connected to USB bridge of
the HFC-S USB is passive.
The registers P_ADR_W (address write) and P_DATA (data read/write) are used by the host to control
the auxiliary port.
PORT_D[7:0] is the multiplexed address/data bus.
The active (low cycle) time of the read and write control signals /AUX_RD and /AUX_WR can be
adjusted by the CIRM register (see also Auxiliary port access on page 57).
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