10
Interface Signal Assignments And Descriptions
Signal summary
The physical interface consists of receivers and drivers communicating through a set of
conductors using an asynchronous interface protocol. Table 2 defines the signal names.
Table 2 - Interface signal name assignments
Description
Host Dir
Dev
Acronym
Cable select
(see note)
CSEL
Chip select0
CS0-
Chip select1
CS1-
Data bus bit 0 ~ Data Bus bit 15
DD0 ~ DD15
Device active or slave (Device 1)
present
(see note)
DASP-
Device address bit 0
DA0
Device address bit 1
DA1
Device address bit 2
DA2
DMA acknowledge
DMACK-
DMA request
DMARQ
Interrupt request
INTRQ
I/O read
DIOR-
I/O ready
IORDY
I/O write
DIOW-
Passed diagnostics
(see note)
PDIAG-
Reset
RESET-
NOTE – See signal descriptions for information on source of these signals
