Vax 613 0S Instruction Manual download pdf (Page 106)

100

101

The IOCTL ASIC services requests from the following:

• The TURBOchannel (I/O read or write)

• Local Area Network Controller for Ethernet (LANCE) DMA

• Integrated Services Digital Network (ISDN) DMA

• Two possible serial DMA requests

The IOCTL ASIC processes one request at a time granting the requests on a ﬁxed

priority basis. The IOCTL ASIC provides address pointers (for DMA), but no

transfer length information, since transfer length counters already exist in the

peripheral devices. Data is never stored on a long-term basis inside the ASIC;

data buffers are valid only at the time of the transfer.

Note

In the following section, the terms ‘‘transmit’’ and ‘‘receive’’ refer to the

ASIC.

This chapter covers the following topics:

• IOCTL address map (Section 7.1)

• System FEPROM (Section 7.2)

• IOCTL registers (Section 7.3)

• Ethernet station address ROM addresses (Section 7.4)

• LANCE register addresses (Section 7.5)

• SCC register addresses (Section 7.6)

• RTC register addresses (Section 7.7)

7–2 IOCTL ASIC and System Registers

1 2 ... 101 102 103 104 105 106 107 108 109 110 111 ... 343 344

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