Configuration Option Register; Apa-1460 Initialization; Scsi I/O Register Map - Adaptec SlimSCSI APA-1460 Technical Reference

APA-1460 SlimSCSI Technical Reference
I/O Space Ranges:
Interrupt Channels:
Other information may be added to the APA-1460 CIS in future revisions.

Configuration Option Register

The APA-1460 Configuration Option Register is an 8-bit wide write-only register into
which the PCMCIA host computer writes a configuration value based on information
read from the APA-1460 CIS.
Bit 7
Definition SRESET
Writing a 1 to
SRESET
a PCMCIA bus reset. If it is necessary to reconfigure the APA-1460,
strobed high.
SRESET
The Resv'd bits are reserved and should be written as 0's.
should be written as a 1 to indicate that the state of
IOEN
Refer to the AIC-6360 Data Book for further information regarding I/O address decoding.

APA-1460 Initialization

On power-up, PCMCIA cards do not respond to I/O cycles, only memory cycles
(Attribute Memory Space cycles). It is necessary to write a value to the APA-1460 Configu-
ration Option Register in order to enable I/O cycle access.
The trickier part of PCMCIA initialization is that the PCMCIA host controller chipset used by
the PCMCIA host computer. As of this writing, there are roughly a dozen implementations,
some of which are similar and some radically dissimilar.
The PCMCIA committee has defined Card and Socket Services in order to simplify the ini-
tialization and operation interface to the PCMCIA hardware. Refer to page -4, Related Doc-
uments, for further sources of information on this topic.

SCSI I/O Register Map

Once the APA-1460 has been properly initialized, it responds to a single I/O address
range consisting of 32 registers. These registers map directly to the corresponding regis-
ters in the AIC-6360 SCSI protocol controller. For example, if the selected I/O address
range is 340 - 35Fh, then I/O address 340h is AIC-6360 register 0, 341h is register 1, and so
forth.
The AIC-6360 interrupt is available and is routed directly to the PCMCIA
interrupt channel must be selected by configuring the PCMCIA host controller chipset.
See the AIC-6360 Data Book for more information on the AIC-6360.
5-4
340h, 140h
9, 10, 11, 12 (level sensitive interrupts)
6 5 4
Resv'd Resv'd Resv'd
forces the APA-1460 into a soft reset state and has the same effect as
should be written as a 0 for normal operation.
Address Range
340h - 35Fh
140h - 15Fh
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APA-1460 SlimSCSI Technical Reference
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Print Spec Number: 492966-00, Rev. A
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Current Date: 8/22/94
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A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
3 2
IOEN Resv'd Resv'd
SRESET
is valid.
Primary
Primary
1
0
IREQ
Page: 5-4
ECN Date: 8/30/94
1 0
Primary
should be
signal. An
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