Address Mapping; Attribute Memory - 0000H To 1Fffh, 8 Kbytes (Read/Write); Configuration Register - 2000H (Read/Write); I/O Address - 340H To 35Fh Or 140H To 15Fh - Adaptec SlimSCSI APA-1460 Technical Reference

Address Mapping

Attribute Memory - 0000h to 1FFFh, 8 KBytes (Read/Write)

Attribute memory is used for recording CIS (Card Information Structure) and is only par-
tially decoded (when A13 is low). Read/write of repeated data occurs every other 8 KByte
block.

Configuration Register - 2000h (Read/Write)

This register is also partially decoded (only when A13 is high). Read/write of the same
register occurs every other 8 KByte block. Any read/write operation within the 8 KByte
range gets the same data or changes this register.
Bit 7 6
1
SRST X
SRST 1: software reset
0: regular operation
IOEN 1: I/O ports are enabled
0: I/O ports are disabled
PRIMARY 1: primary address (340h)
0: alternate address (140h)
1
In the PCMCIA Specification, this bit is defined as Lev1IREQ. In fact, this is the way the host notifies the card which interrupt protocol
should be used for the host's acceptance. When it is set, the host recognizes the interrupt in Level Mode (interrupt must stay active till
accepted). When it is reset, the host recognizes the interrupt in Pulsed Mode (accepted by signal transition). In this design, because the
interrupt signal is fully controlled by the AIC-6360 internal register, we can choose either Level or Pulsed Mode interrupt through soft-
ware. In the CIS, the default interrupt mode is set to level mode. Currently there is no internal function circuit attached to it.
2
Reset condition

I/O Address - 340h to 35Fh or 140h to 15Fh

Overlapping Address Mode is used in the design for software compatibility with the cur-
rent ASPI driver. Check the AIC-6360 Data Book for port definitions.
Special purpose port: Port B (35Bh or 15Bh) - write only
Bit 7 6
X TERM_EN
TERM_EN 1: active termination enabled
0: active termination disabled (power down)
1
Reset condition

Common Memory

Common Memory is not applicable for the APA-1460.
5 4
X X
2
2
2
5 4
X X
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APA-1460 SlimSCSI Technical Reference
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A Stock Number: 510671-00, Rev. A
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Print Spec Number: 492966-00, Rev. A
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Current Date: 8/22/94
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IOEN X X
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Page: 5-5
ECN Date: 8/30/94
Functional Specification
0
PRIMARY
0
X
A
A
A A
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5-5
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